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Best Outdoor Tankless Water Heaters in 2020: Reviews & Buyers Guide

In this review/guide article, I’ll review 10 best outdoor tankless water heaters in 2020 from 5 internationally trusted brands.

For small to the largest of homes as well as avid campers, you could find the right options!

For each, I’ll deep dive into the tech details, Pros & Cons, and regional information!

A comprehensive Buyers Guide including a unique FAQ section is also given at the end discussing the best options for different scenarios such as your geographical regions, budget, family type, specific needs, etc.

If in a hurry, see our    Editors Pick    and    Comparison Table    at first!

 

 

You want hot water. You don’t want a big, clunky hot water tank, and you’d prefer to keep it outside.

So, then you’re looking for the best outdoor tankless water heaters in 2020. Sound like you?

A lot of people have been moving towards the ‘tankless arena’ as the positives far outweigh those of the large tank counterparts.

There’s so much to love about tankless water heaters. They’re faster, more efficient, all around better than tanks.

There are many options you can choose when going tankless, one of which is whether you want it to be outdoor or not.

Now, you could have many reasons for wanting your tankless water heater outdoors. Whatever your reason, no matter, you’ll have plenty of options.

When looking at outdoor options, you’ll still have a large variety to browse through. And that’s good.

That means no matter what it is you’re looking for, there will be a perfect fit for you and your home!

We’ll make sure to spend some time in this article going over lots of options, discussing pertinent details and regional information, and making sure we pinpoint the models that will best fit your current situation.

Everyone can get a fantastic outdoor tankless option that they’ll be pleased with for many years! But not everyone will have the same exact model that fits their bill.

So, let’s dive into this and find you all the best outdoor tankless water heaters in 2020!

I promise, there’s plenty to go around for all of you!

Overall Best Outdoor Tankless Water Heaters

For Small To Medium-Sized Homes

 

Rinnai RL75

Rinnai is a respected and trusted brand with a lot of cool features to offer.

It’s available in either propane or natural gas fuel with outstanding 7.5 maximum gallons per minute (GPM), perfect for 2 to 4 fixtures running concurrently.

Something you’ll surely love about Rinnai’s RL series is that they’re Circ-Logic capable and Control-R Wi-Fi capable!

Meaning with some add-ons, you can incorporate Rinnai’s advanced recirculation technology and you can make any adjustments needed by any of your Wi-Fi devices!

You can tell Alexa to get your shower heated up for you!

See to the review section for in-depth tech details and regional information!

Overall Best Outdoor Tankless Water Heaters

For Large Homes

 

Rinnai RUR199

The best ever option with an exceptional maximum 11 GPM, which is great for 3 to 6 fixtures simultaneously, depending on your region and specific situation.

The simultaneous appliance use is even better; It serves multiple appliances flawlessly.

It is Energy Star Qualified so it will give you consistently better savings on energy and money of course!

And that unique Circ-Logic Capability and Control-R Wi-Fi you hear so much about with Rinnai’s lines… it comes already included.

Let Alexa know you want to start a hot shower for one of your loved ones… you don’t even need to get up from your comfy seat!

Read the review section for in-depth tech details and regional information!

Best Outdoor Tankless Water Heaters on a Budget

For Small To Medium-Sized Homes

 

Eccotemp 45H

This great budget, lightweight option is available in either propane or natural gas fuel with maximum of 6.8 GPM.

It works nicely for standard apartments or small to medium-sized homes. Specifically, it’s great for most low-flow appliances.

Use above 2,000 feet may affect its performance though and use is not recommended above 5,000 feet.

Refer to the review section for in-depth tech details and regional information!

Best Outdoor Tankless Water Heaters on a Budget

For Large Homes

 

Rheem RTG-95XLN

Rhemm is one of the best and trusted brands to serve the large homes.

Rheem offers the RTG-95XLN which is a Natural Gas option, or you can go XLP if you want Propane as fuel with amazing maximum of 9.5 GPM.

This is a great option if you have multiple appliances running simultaneously.

It has ‘hot start technology’ which is a great feature that recognizes when hot water in high demand and minimizes fluctuations in water temperature to already running appliances.

It’s also ‘EcoNet Enabled’ so it can connect to the EcoNet mobile app via the Tankless EcoNet Accessory Kit.

Rheem also claims an industry best for this line… freeze protection to -30 degrees Fahrenheit!

And for those at high altitudes… the Rheem RTG-95XLN could be used up to 8,400 feet above sea level!

Read the review section for in-depth tech details and regional information!

Overall Best Outdoor Tankless Water Heater That’s Portable

 

Camplux 16L

Looking at smaller options that are much more portable, the Camplux brand could be No. 1!

In particular, the 16L model can achieve a maximum 4.22 GPM and a maximum power output at 110,000 BTU/hour!

A great option for camping, especially if your camping party has a few extra people. Also, great for giving any pets a bath outside.

It has a digital temperature display that makes everything easy for you to read even in the dark.

And it has a thermal efficiency of 88.5% which is pretty good when you’re out in the wilderness!

Even better, you also get the safety features of flame failure device, anti-freezing protection and over-heating protection. A safe choice, and a great choice!

If you’re looking for the most power in a portable model, the Camplux 16L might be your choice for best outdoor tankless water heater in 2020.

See the review section for in-depth tech details and regional information!

Best Budget Outdoor Tankless Water Heater That’s Portable

 

Camplux 5L

The Camplux 5L with an impressive 28,000 BTU/hour and maximum 1.32 GPM is also great for camping and is very affordable!

Take this with you on all your camping trips, music festival excursions, or just bring it outside to wash the dogs or horses!

You can also have some pretty cool safety features such as flame failure device, over-heating protection and anti-freezing protection.

You can even use it indoors (as long as it’s well-ventilated) thanks to its Oxygen Depletion Sensor Protection!

Refer to the review section for in-depth tech details and regional information!

Outdoor tankless water heaters can serve many different kinds of homes.

They could also be portable types that you take with you camping or use for daily chores.

Small homes, large homes, avid campers… you’re all able to find yourself a great outdoor tankless water heater.

 

In this article, I’ll review 10 different tankless water heaters, all of which are best for outdoor use.

They all vary a bit and serve slightly different purposes. Whatever you’re looking for, it’s on this list.

 

At first glance, several options may seem good for you. And that may be true.

But of course, we want to know what are the best outdoor tankless water heaters in 2020. You shouldn’t settle for anything but the best.

All of these models we will review can claim they’re the best for different reasons. Each one is better suited for different people and different situations.

So, what is it that you need? What do you want?

Let’s go over your checklist.



Think up any questions you want to ask. And have your specific details handy and ready.

For instance, is this for camping or for a house?

Is this for a large or smaller home?

What region do you live in?

How many people live in your home?

And quite importantly… how many people will concurrently be using hot water appliances?



Keep all of that in mind as we review all of these incredible choices.

We’ll go over all the important details of each model and get a real clear view of them all.

We’ll make sure to point out similarities and differences along the way and help you understand which option’s best suited for your situation and needs.

And by the end of this article, you’ll have a crystal-clear idea of the best outdoor tankless water heaters in 2020!

And then you’ll finally be able to make the very best one all yours.

 

 

So, let’s get to it!

Let’s start with a short overview of the selected outdoor water heaters and a helpful table comparing their specifications.

What are the Best Outdoor Tankless Water Heaters in 2020?

Quick Answer:

Best Outdoor Tankless Water Heaters for Small to Medium-Sized Homes

Best Outdoor Tankless Water Heaters for Large homes

Best Outdoor Tankless Water Heaters for the Largest of Homes

Best Outdoor Tankless Water Heaters That Are Portable

Comparison Table for the Best Outdoor Tankless Water Heaters in 2020

Tankless Water Heaters View on Amazon Type Maximum GPM Weight (Pounds) (Depth, Height, Width) in inches
Eccotemp 45H-NG Natural Gas or Propane 6.8 GPM 27 lbs. 10 x 29 x 17
Noritz NR66-OD-NG Natural Gas or Propane 6.6 GPM 36 lbs. 6.7 x 20.5 x 13.8
Rinnai RL75 Natural Gas or Propane 7.5 GPM 43.6 lbs. 9.6 x 24.3 x 14.04
Rheem RTG-95XLN Natural Gas or Propane 9.5 GPM 54 lbs. 8.88 x 25.63 x 13.88
Rheem RTG-95XLP Professional Prestige Natural Gas or Propane 9.5 GPM 82 lbs. 9.88 x 25.63 x 13.88
Noritz NR98-SV-NG Natural Gas or Propane 9.8 GPM 54 lbs. 9.4 x 23.6 x 13.8
Rinnai RU199 Natural Gas or Propane 11 GPM 64 lbs. 12 x 27.9 x 18.5
Rinnai RUR199 Natural Gas or Propane 11 GPM 73 lbs. 12 x 27.9 x 18.5
Camplux 5L Propane 1.32 GPM 14 lbs. 4.33 x 14.8 x 11.42
Camplux 16L Propane 4.22 GPM 36 lbs. 7.87 x 27.56 x 17.32

Best Outdoor Tankless Water Heaters for Small to Medium-Sized Homes

1. Eccotemp 45H-NG

Starting in the arena of medium-sized homes, we’ll begin with the brand Eccotemp, looking specifically at the Eccotemp 45H-NG.

The NG stands for Natural Gas, however, you can get this same model with Propane if you wish.

As a tankless water heater goes for medium-sized homes, the Eccotemp 45H is a great choice.

A fairly inexpensive choice as well. It’s just about $499. For those shopping on a budget, this is the cheapest on the list of medium-sized homes options.

If you have a standard apartment or small to medium-sized home, this option is great for getting the job done.

Ideal for one or two bathrooms, or a situation with a few hot water appliances running at once.

 

 

TECH SPECS

The Eccotemp 45H runs at a maximum of 140,000 BTU per hour and it has a fully automated control system.

It can achieve a maximum of 6.8 gallons per minute (GPM), which is not too shabby for your medium-sized home.

Among the options in this section, it’s the lightest one, weighing only 27 lbs. In fact, with the exception of only one other model, it’s the lightest on this whole list of 10!

Though all tankless water heaters are vastly smaller than traditional hot water tanks, the dimensions of 10 x 29 x 17 inches make the Eccotemp 45H the largest of all the medium-sized home options.

Largest in depth, height, width, and of course, overall cubic inches at 4,930.

But if you’re upgrading from a hot water tank… then this option will still be so much smaller.

Important to note, they do mention that the Eccotemp 45H has been tested at elevations up to 2,000 feet.

Use above 2,000 feet might affect its performance and use is not recommended above 5,000 feet.

On the positive side, the minimum activation flow rate is 0.8 GPM so this model is great for most low-flow appliances.

 

 

REGIONAL INFO

Now, it’s of course important to note where you live when deciding on purchasing a tankless water heater.

Knowing the ground water temperature in your region is the main factor.

If you live in areas where the ground water temperature is around 40 degrees Fahrenheit, you’ll be getting around 2.6 GPM.

So, cities far north like Augusta, St. Paul, and Vancouver and other Canadian cities… you’ll be able to run a shower and another appliance at once, whether it’s a kitchen or bathroom sink.

Taking the low-flow appliance route can get you more out of the Eccotemp 45H, probably even two showers.

Places still up north but a tad warmer, where the ground water temperature is closer to 50, you should be able to get 3.9 GPM.

Cities such as Providence, Kansas City and Portland, you could easily get two standard showers going at once.

Depending on the flow rate and if you decide on any low-flow appliances, two showers and another sink or two could be possible.

Moving south, places with ground water temperature averaging around 60, say hello to 5.5 GPM.

Cities like Charlotte, Tulsa, Las Vegas… that could possibly be three showers, it’s definitely three to four fixtures depending on which types.

And how about even farther south… in areas where the ground water temperature is about 70, that’s where you can achieve 6.4 GPM and even up to the maximum of 6.6 GPM in plenty of cases.

Places like Miami, Montgomery and San Diego, that’s three simultaneous showers and a bathroom sink easy.

How about two showers, two bathroom sinks and a kitchen sink being run concurrently?

If that’s what you need, the Eccotemp 45H can do it!

Pros

  • Cheapest option for smaller to medium-sized homes
  • Lightest option among those for smaller to medium-sized homes
  • Fairly powerful for smaller model

Cons

  • Not the highest GPM of options for smaller to medium-sized homes
  • Largest sized option among those for smaller to medium-sized homes

2. Noritz NR66-OD-NG

Another great option for your medium-sized home or apartment is the Noritz NR66-OD-NG.

NG stands for Natural Gas, but you can also choose this model to come in Propane.

The cost of this model is about $753, so it’s a good deal more expensive than the last option.

However, it’s still not the most expensive on this list of options for medium-sized homes.

This is another option perfect for a one to two bathrooms situation, whether it be a house, apartment, condo, etc.

It works well in situations when multiple other hot water appliances run concurrently as well.

 

 

TECH SPECS

The Noritz NR66 has a 0.81 UEF (Uniform Energy Factor) which is good to note for those of you wanting to conserve energy and money spent in the long run.

A minimum BTU per hour of 15,000 and like the Eccotemp before, a maximum of 140,000 BTU per hour.

This water heater can reach a maximum of 6.6 GPM, slightly lower than the last option, but extremely close.

It’s not as light at 36 lbs. but it’s much smaller in every way!

The dimensions of 6.7 x 20.5 x 13.8 inches actually make it the smallest of the three options for medium-sized homes in depth, height, width and cubic inches, sizing up at only 1,895 cubic inches.

If you’re looking for the smallest possible option for your medium-sized home, then this may be the best outdoor tankless water heater in 2020 for you as it’s much smaller than the others!

Another interesting fact about the Noritz NR66 is the temperature range it provides, which is stated as 100 – 150 degrees Fahrenheit (and can possibly reach up to 160 in some situations).

Most other options on the market max out at 140, but they also typically can go lower than 100.

It also can be adjusted in 5-degree interval whereas there are many options that can be adjusted even in 1-degree intervals.

So, perhaps you don’t get the same accuracy with this option, or the lower temperature if desired… but if you need hot, hot water… then Noritz is a hot, hot choice!

It does have a default maximum temperature of 120 degrees, so you’ll have to make sure to unlock the ability to go higher.

The Noritz NR66 also features direct ignition, so no standby pilot light, and a thermal fuse which helps to protect the system from overheating.

 

 

REGIONAL INFO

Now, looking to the regions, the Noritz NR66 will give similar results as the Eccotemp 45H, though slightly lower.

In areas where the ground water temperature is around 40 degrees Fahrenheit, you could expect 2.4 – 2.5 GPM.

So, if you live in the likes of Milwaukee, North Dakota, Toronto or other areas in Canada, you could get one shower going along with another appliance.

Consider some low-flow options to get the most use of this option if you live this far north.

Areas with ground water temperature closer to 50, you’ll receive more hot water per minute. Probably around 3.7 GPM would be your range.

That means people in areas like Boston, Indianapolis or Seattle should likely be able to run two simultaneous showers in most cases.

This is a great option if your household tends to run a shower while someone else uses the kitchen sink.

How about we move south?

Areas with ground water temperature floating around 60, you should expect something in the ballpark of 5 – 5.3 GPM.

So, if you live in areas like Atlanta, Memphis, and even farther up north like Oakland, you could likely run three showers at once in your home!

And possibly even use a sink in addition. This option could work great for a three to four-person household.

And even farther south, in areas with an average ground water temperature of about 70 or above, look for that maximum GPM of 6.6!

If you’re living in Los Angeles, San Antonio, Puerto Rico and plenty other southern places, you’ll love your three showers running plus additional appliances!

If you’re already set up with low-flow appliances, four showers will be all too easy for the Noritz NR66 to handle.

Pros

  • Not the cheapest but still a fairly cheap option
  • Has a higher maximum temperature output than most units do
  • One of the lighter options available and is the smallest option among units for small to medium-sized homes

Cons

  • Lowest GPM of options for smaller to medium-sized homes
  • Only can be adjusted in 5-degree increments

3. Rinnai RL75eP

The third option on this list for medium-sized homes is the Rinnai RL75eP.

Now, the Rinnai RL can come in either Propane (as the ‘P’ denotes) or Natural Gas (as an ‘N’ would denote). This is an outdoor model (hence the ‘e’) but can also be indoor (using an ‘i’).

The Rinnai RL is said to be perfect for 2 to 4 fixtures running concurrently. Rinnai is an amazing and trusted brand with a lot to offer.

With the perks, does come the cost. About $1120 does make this the most expensive option of the three we’ve reviewed so far.

Let’s explore why this price tag sits where it does.

You may also read: Best Rinnai Tankless water Heaters in 2020

 

 

TECH SPECS

Let’s note first that the 7.5 maximum GPM is a good deal higher than both previous options.

Rinnai also has comparable 6.5 GPM max options, but the 7.5 gives you some more flexibility and wiggle room. This is nice if either of the last two options seems to fall just a tad short.

The dimensions of 9.6 x 24.3 x 14.04 inches put this option right in the middle for size.

The 3,275 cubic inches makes it noticeably larger than the Noritz but still smaller than the Eccotemp.

The weight of 43.6 lbs. does make this the heaviest of these three options.

The RL series from Rinnai uses Non-Condensing technology so the energy efficient rating is only 0.81 – 0.82, which is comparable to the Noritz though.

Something you’ll love about Rinnai’s RL series is that it’s Circ-Logic capable and Control-R Wi-Fi capable.

Meaning with some add-ons, you can incorporate Rinnai’s advanced recirculation technology and you can make any adjustments needed through any of your Wi-Fi devices!

Want to tell Alexa to get your shower heated up for you? Rinnai’s RL series can make that happen!

 

 

REGIONAL INFO

Now, the Rinnai RL75 is going to afford you some more gallons per minute (GPM) in each region.

Let’s see if this is a difference maker for you.

In areas with ground water temperature averaging around 40 degrees Fahrenheit, you can likely achieve around 3.7 GPM.

This is including the farthest northern areas of North America.

Places like Minneapolis, Montana, and cities in Canada like Montreal, you should be able to get two showers operating at once in most cases! Definitely good for a shower and a sink being run together.

Areas with ground water temperature around 50, you’ll be looking at around 4.8 – 4.9 GPM.

Cities finding themselves fairly north like Boise, Detroit, and New York City will have no problem running two showers along with a bathroom sink.

If you’re a low-flow kind of family, four fixtures at once could be possible.

In places with ground water temperature averaging around 60, you should expect around 6.3 GPM from this unit.

So, if you’re living in the south in the U.S., places like Charleston, Nashville and Dallas… your household can run three showers simultaneously with much ease.

And in areas with ground water temperatures close to 70 and above… this is where you’ll be getting above 7 GPM and even hitting that maximum 7.5 GPM!

Think places like New Orleans, Daytona Beach and all of Mexico!

If you live in those areas, you could probably operate four showers in most scenarios.

Or run the dishwasher while you and a couple other members of your home take your morning showers.

Rinnai’s RL75 makes it all too easy for you.

Pros

  • Most powerful and highest GPM of smaller to medium-sized home units
  • Not too big and bulky
  • Circ-Logic capable
  • Control-R Wi-Fi capable
  • Advanced recirculation technology

Cons

  • Most expensive of options for small to medium-sized homes
  • Not as small as you can get
  • Heaviest of small to medium-sized home options

Best Outdoor Tankless Water Heaters for Large homes

4. Rheem RTG-95XLN

Looking at options for larger homes with more going on, we first look to one of the best and trusted brands around, Rheem.

Rheem has the RTG-95XLN which is a Natural Gas option, or you can go XLP if you want the Propane version.

This is a great option if you have multiple appliances being run in your home at once.

The maximum 9.5 GPM is very nice.

And for those of you at high altitudes… the Rheem RTG-95XLN can be used up to 8,400 feet above the sea level!

Costing around $925, this model is actually a tad cheaper than the Rinnai RL75 we reviewed for medium-sized homes!

And it’s much cheaper than all the other large home options, so look to this model if you’re looking to keep your choice on a budget.

 

 

TECH SPECS

Though the RTG-95XLN is Energy Star Certified, the energy factor of 0.82 is just about the same as the last couple of models we reviewed.

It has a minimum 11,000 and maximum 199,900 BTU and this model still manages to be classified as having low emissions.

It has “hot start technology”, which is a great feature that recognizes when hot water is in high demand and minimizes fluctuations in water temperature to already running appliances.

Perfect for those who don’t like surprises during their morning ‘wake-me-up’ shower.

The RTG-95XLN is also ‘EcoNet Enabled’ so it can connect to the EcoNet mobile app via the Tankless EcoNet Accessory Kit.

Another device capable option allowing you to operate with ease, quite the plus!

Or if you want to use the digital remote control, they got that too.

Rheem also claims an industry best for this line… freeze protection to -30 degrees Fahrenheit!

The weight of 54 lbs. makes it one of the lightest options among the large home models.

Though it isn’t the shortest or thinnest option, it is the smallest in depth.

It’s dimensions of 8.88 x 25.63 x 13.88 inches give it an overall 3,159 cubic inches of size, making it a close second smallest of all large home choices.

 

 

REGIONAL INFO

These more powerful models will fare better in the northern areas.

In places with ground water temperatures around 40 degrees Fahrenheit, the Rheem RTG-95XLN should be able to get you about 4.7 GPM.

Places like Buffalo, Michigan’s upper peninsula and plenty of Canadian cities including those at high altitudes like Calgary can easily run two showers and a sink all at once!

In areas where ground water temperatures are about 50, you should expect about 5.5 GPM.

Places like Newark, Chicago, and with its high-altitude capacity, Denver… your household can run two showers and a couple more appliances at once. Possibly even three showers if their flow rate isn’t too high!

In areas where ground water temperatures are about 60 – 65 degrees Fahrenheit… expect right around 7 GPM.

If you’re living in the southern areas like Arkansas, Virginia, and most of New Mexico… this model can handle three showers and a sink all at once!

In areas where ground water temperatures are 70 and up, this is where you’ll be hitting that maximum GPM of 9.5.

We’re looking at places quite far south like Tampa Bay, Houston, the Caribbean Islands.

And if that’s your region, you could run the dishwasher while four people run four different showers. No one will lose any hot water!

Pros

  • Cheapest option for large homes
  • Great even at high altitudes
  • Wi-Fi capability

Cons

  • Not the most powerful option for large homes
  • Not quite the smallest option for large homes
  • Isn’t the most energy efficient option

5. Rheem RTG-95XLP Professional Prestige

Sticking with the same line from Rheem, we have a fairly identical model.

The main difference you’ll notice in the name is “Professional Prestige”. This is the upgraded version of the last model.

You will also notice the XLP rather than XLN Just to show you the options they have within the RTG line from Rheem.

But this model can come in your choice of either propane or natural gas.

You still have high-altitude capability with this model. Up to 8,400 feet in elevation is still possible.

The cost of this upgrade though is about $1,350. So, let’s see why it costs much more.

 

 

TECH SPECS

Let’s start off by saying, you’re going to get all the same great features with this model.

Hot Start Technology minimizing fluctuation in water temperature… still there.

You still get a minimum 11,000 and a maximum 199,900 BTU per hour.

You still get a digital remote control and have the option of getting an EcoNet Accessory Kit and connecting to the EcoNet mobile app to use in tandem with the Professional Prestige.

This model also has a maximum 9.5 GPM.

It also features the industry best freeze protection all the way to -30 degrees Fahrenheit.

And it also has low emissions and is Energy Star Certified.

Now, touching on the area of energy, the Professional Prestige takes it a step further.

It uses condensing technology and has a built-in condensate neutralizer.  All this might not mean too much to you, but to state in the most appealing terms, it gets up to 0.93 UEF (Uniform Energy Factor).

That is much more energy saved, and though you pay more for this model up front, it’s much more money saved for you in the long run.

Looking to make a smart long-term investment? Then, this could be one of the best outdoor tankless water heaters in 2020!

The dimensions of 9.88 x 25.63 x 13.88 inches make this model just as tall and wide, but slightly larger in depth.

So, that obviously makes the 3,515 cubic inches clock this model in to be the largest for the large home options, excluding the next section for the largest of homes.

And the weight of 82 lbs. makes this the absolute heaviest of all the models, bar none. But with great weight, of course, comes great ability.

 

 

REGIONAL INFO

Now, this model is a step up from the previous model in several areas, but when looking at what it can do regionally, those results tend to be about the same.

In areas with ground water temperatures of around 40 degrees Fahrenheit, you’ll get about 4.7 GPM.

Places way up north like New Hampshire, Vermont, Winnipeg and other Canadian cities, rejoice in your ability to run two showers along with a sink!

And don’t worry if you’re situated in the mountains, the Professional Prestige from Rheem can handle the altitude.

In places with ground water temperatures of around 50, you’ll be getting about 5.5 GPM.

Cities that are situated fairly north like Philadelphia, Cleveland and even high-altitude Salt Lake City, you can run two showers along with a couple more appliances. Perhaps even three showers if the flow rate isn’t too high!

In areas where the ground water temperature is around 60 – 65, you can achieve right around 7 GPM.

This applies to more southern places like Raleigh, Roswell and St. Louis… your family can run three simultaneous showers along with a sink.

And in areas with ground water temperatures of around 70 and higher, you can achieve the maximum of 9.5 GPM.

Places like the Hawaiian Islands, Baton Rouge and even the fairly high-altitude city of Tucson… four showers can run.

The dishwasher can run along with them. It’s all do-able.

Depending on the types of fixtures, you can run even more than that with the Professional Prestige!

Pros

  • One of the more energy efficient options for large homes saving you money in the long run
  • Great even at high altitudes
  • Wi-Fi capability

Cons

  • More expensive up front than the previous Rheem model
  • Larger option and heaviest option for large homes
  • Not the most powerful option for large homes

6. Noritz NR98-SV-NG

Here’s another model from Noritz, but the NR98-SV-NG is tailored for larger homes.

The NG stands for Natural Gas, but as is common with these tankless water heaters, you can also choose the Propane version.

This is another model that can also be used for indoor or outdoor.

This definitely fits the bill for a large home with several people running hot water from multiple spots at once, but among the large home models (that aren’t for quite the largest of homes), this is the most expensive at about $1,450.

 

 

TECH SPECS

The 0.81 Uniform Energy Factor is comparable to the Rheem RTG-95XLN but well below the likes of the Professional Prestige.

The long-term savings on energy and money won’t be as good with this option.

The maximum 199,900 BTU/hour is the same; however, the minimum 16,000 is actually a bit higher than the other two options.

Another difference, where the last two options had a maximum of 9.5 GPM, here you’ll get a maximum 9.8 GPM.

Sometimes, every little bit count. If you want the extra assurance you’ll have enough hot water flowing through your unit, this option gives you more.

The temperature range for this unit is typically 100-140 degrees Fahrenheit, being able to be adjusted in 5-degree intervals.

There are some options in this that you can tinker with, but in general the precision of water temperature is not quite as good with this model compared to some others.

However, at 54 lbs. it’s lighter than all other large home models and the same weight as the Rheem RTG-95XLN!

With dimensions of 9.4 x 23.6 x 13.8 inches, it’s the smallest in height and smallest in overall cubic inches clocking in at 3,061.

So, if you want to service your large home but need to save as much space as possible, look to the Noritz NR98 as a possible choice for your best outdoor tankless water heater in 2020!

 

 

REGIONAL INFO

In areas far north where the ground water temperature is around 40 degrees Fahrenheit, you should be getting a solid 5 GPM.

This includes, but is not limited to, Upstate New York, South Dakota, Ottawa and plenty other Canadian cities. If you live in these areas, the Noritz NR98 can you allow you to run two showers and a kitchen sink.

In places where the ground water temperature is around 50, you should be able to achieve around 5.8 GPM.

So, the likes of Baltimore, Pittsburgh and Cheyenne, your residents will be able to run two simultaneous showers along with a couple more appliances. Go low-flow and you could run three showers!

In areas where the ground water temperature is around 60 – 65, expect a good 7 – 7.7 GPM.

This includes areas a bit more southern like Louisville and Wichita but even San Francisco as well. Residents in these parts can run three showers plus some more appliances with great ease. A nice choice for three-bathroom home with a good deal going on.

In places where the ground water temperature is 70 and above, here you can be looking at achieving that maximum 9.8 GPM.

Places far south like Austin, Mobile and Jacksonville… this unit can allow you to run four simultaneous showers plus a few more appliances.

Four showers and a dishwasher are likely doable. In some instances, even five showers… if you have that many.

Pros

  • Smallest unit for large homes
  • Better power and higher GPM than the previous two Rheem models
  • Lighter option for large homes

Cons

  • More expensive than both Rheem models
  • Not as energy efficient
  • Temperature has to be adjusted in 5-degree increments

Best Outdoor Tankless Water Heaters for the Largest of Homes

7. Rinnai RU199eP

Now, still in the arena of servicing large homes, but in a slightly different arena of serving the largest of homes… or perhaps larger homes that have more activity going on within them.

We will take a look at a great model from Rinnai, their RU199eP model.

This is another option from Rinnai that can be Propane or Natural Gas, Outdoor or Indoor.

This model is said to be ideal for 3 to 6 fixtures running at once.

It’s pricier, running around $1,660. More expensive than all the other options we’ve reviewed.

Let’s take a look at why that is.

You may also read: Best Rinnai Tankless water Heaters in 2020

 

 

TECH SPECS

The first thing to note is the outstanding maximum 11 GPM that the RU199 can achieve.

Definitely great if you’ve got a lot happening inside your large home.

The dimensions of 12 x 27.9 x 18.5 inches make this the biggest unit we’ve seen so far, in every regard.

Depth, height, width, and it’s 6,194 cubic inches. That’s to be expected when you’re pumping out this much hot water though.

It’s fairly heavy at 64 lbs. Though, it isn’t the heaviest outdoor model available.

Being that the RU199 is Energy Star Qualified and uses Condensing technology, you get an impressive 0.91 – 0.93 UEF!

That saves energy and money over time. You may find this to be well-worth investing in. This is surely an investment!

And just like the Rinnai RL75, the RU199 is Circ-Logic Capable and Control-R WiFi Capable.

With a couple add-ons you can have Rinnai’s advanced recirculation technology incorporated into this model as well as the ability to make adjustments as needed from any of your Wi-Fi devices!

 

 

REGIONAL INFO

Looking the farthest north regions where the ground water temperature is around 40 degrees Fahrenheit, you’ll be getting around 6 GPM with Rinnai’s RU199!

Places up north like Spokane, Green Bay and Nova Scotia along with other Canadian provinces… that is three concurrent showers running in your home, easy!

Still up north, but not so far north, areas where the ground water temperature is around 50, you should be able to achieve 7 GPM.

Places like Washington D.C., Cincinnati and Tacoma can operate three showers at once along with a sink. Depending on the shower head, you could possibly even run four showers.

Areas with ground water temperature in the 60 – 65 range, you should be looking at about 8.1 – 8.9 GPM.

We’re talking some southern areas of the U.S., the likes of Santa Barbara, Albuquerque, Oklahoma City, etc….

Homeowners in these regions, family of four all need to shower at the same time every morning? No problem. You might even be able to run a sink in addition to all that.

And places where the ground water temperature is 70 and up, this is where you’ll be achieving the full 11 GPM or very close to it.

This includes such southern cities as Phoenix, Tallahassee and Temecula.

You have the luxury of running five concurrent showers and a sink to boot!

Six fixtures at once is easy, depending on what the fixtures are, you could be running quite a few more.

Pros

  • One of the most powerful and highest GPM you’ll get
  • Circ-Logic Capable
  • Has Wi-Fi capability
  • Quite energy efficient option; great investment in energy
  • Can have great recirculation technology added on

Cons

  • Second most expensive option on the list
  • Wi-Fi isn’t automatically included
  • One of the heavier and larger options
  • Recirculation technology not already included

8. Rinnai RUR199eP

We turn now, to the top of Rinnai’s lines, and the top model in that line, the RUR199.

Again, you can choose that to be Propane or Natural Gas and you can choose that to be Outdoor or Indoor.

This model is good for 3 to 6 fixtures simultaneously, depending on where you live and what your specific situation is.

And at about $2,075, it is the most expensive model on this list. It’s the most expensive for good reason though.

You may also read: Best Rinnai Tankless water Heaters in 2020

 

 

TECH SPECS

You’re still getting the top of the line maximum 11 GPM like you were with the RU199.

The dimensions are the same 12 x 27.9 x 18.5 inches making it the largest option along with the RU199. The cubic inches still being 6,194.

The weight of the RUR199 is about 73 lbs. so it’s actually a bit heavier. It’s the second heaviest option on this list behind only the Professional Prestige from Rheem.

The RUR199 also uses Condensing technology and is Energy Star Qualified but also has a more consistent 0.93 UEF.

So, this model will give you consistently better savings on money and energy even better!

The simultaneous appliance use is even better with the RUR199. It serves multiple appliances flawlessly.

And that great Circ-Logic Capability and Control-R Wi-Fi Capability you hear so much about with Rinnai’s lines… it comes already included. No extra add-ons needed. No confusion. It’s already there for you.

Let Alexa know you want to start a hot shower for one of the kids… you don’t even need to get up from your comfy seat!

 

 

REGIONAL INFO

Rinnai’s RUR199 will achieve very similar hot water flow rates as the RU199, but it will have a slight advantage in some areas.

In areas where the ground water temperature is around 40 degrees Fahrenheit, the RUR199 can get right around 6.3 GPM.

Very northern areas in the U.S. like Syracuse and Lansing and cold Canadian cities like Quebec City, you’ll be afforded the luxury of running three showers at once.

Depending on your shower heads, you may even be able to run a bathroom sink along with them!

In places with ground water temperatures around 50, look for around 7 GPM.

This includes much of the northern U.S. that isn’t quite the most northern. Places like West Virginia, Nebraska, Northern California. If you have a home in these regions, three showers and a sink running concurrently is all too easy for you.

Moving farther south, areas where the ground water temperature is around 60 – 65… you can expect a range of around 8.3 – 9.1 GPM.

This includes cities like Santa Fe, Birmingham and Little Rock. Your households can have four simultaneous showers going, and depending on your specific situation, perhaps a low-flow or regular bathroom sink on top of that.

And then in areas quite far south, where the ground water temperature is 70 and up, you can reach that maximum 11 GPM or quite close to it.

This includes, but is not limited to the likes of, Orlando, Palm Springs, Corpus Christi.

Even if you live in vacation destinations down south, it will feel like you’re on vacation too, running five simultaneous showers with a sink to boot!

No one will be late again if you equip your house with the RUR199!

Pros

  • One of the most powerful and highest GPM you’ll get
  • Circ-Logic Capable
  • Has Wi-Fi capability already included
  • The most energy efficient option for large homes
  • Great recirculation technology already included

Cons

  • Most expensive option on the list but for good reasons
  • Second heaviest option on the list
  • One of the largest options on the list

Best Outdoor Tankless Water Heaters That Are Portable

9. Camplux 5L

Taking a look in the arena of smaller options that are much more portable, we have two great options from Camplux.

The first is this 5L Outdoor Propane tankless water heater. This is more of a point-of-use, take-it-camping type option.

It only costs about $130 and for such a low price (the lowest on the list), it still offers a lot!

 

 

TECH SPECS

The Camplux 5L has an impressive 28,000 BTU/hour for its small size and can give you a maximum 1.32 GPM.

It may not sound like a whole lot, but for what you intend to use it for, it should be plenty.

It’s by far the smallest and lightest option on this whole list.

The dimensions of 4.33 x 14.8 x 11.42 inches make it a tiny 732 cubic inches and it weighs a mere 14 lbs.

Take this with you on all your camping trips, music festival excursions, or just bring it outside to wash the dogs or horses!

The Camplux 5L operates on as low as 3.0 PSI and works up to 110.0 PSI.

It’s also generally going to be used outdoors but with Oxygen Depletion Sensor Protection equipped, you can also use it indoors as long as it’s well-ventilated!

Some safety features include flame failure device, anti-freezing protection and over-heating protection. So, worry not, with your Camplux tankless water heater!

 

 

REGIONAL INFO

It is said the Camplux 5L can operate up to 2,000 feet in elevation, but is not recommended above that.

So, take it on all your outdoor excursions in which you aren’t heading too high in elevation.

As the name suggests, it’s the perfect camping companion. Take it on camping trips whether you’re in Arkansas, Kansas, Southern California… or maybe you’re going to be heading to Coachella for the weekend.

No matter the setting, this is a fantastic option for many future trips!

And if you’re someone with a farm or perhaps just a large outdoor area on your property… don’t feel left out! The Camplux may fit your needs as well.

From horse ranches in California to Alpaca farms in New Hampshire… as mentioned before, if you need to give a quick bath to your outdoor animals… the Camplux 5L is an excellent choice for your neck of the woods.

Pros

  • Fantastic, small, portable option
  • The lightest option of all and cheapest as well
  • Includes fantastic safety features

Cons

  • Low power and GPM flow rate
  • Isn’t recommended above 2,000 feet

10. Camplux 16L

Now Camplux might sound like a great brand for you, and you love the idea of a portable tankless water heater.

And maybe the 5L seemed like it wasn’t quite enough to get the job done for you.

Well, Camplux also has the big brother 16L for you to choose!

It’s another propane option and costs about $330. And it might be the step up that you need to take.

 

 

TECH SPECS

This model from Camplux can achieve a maximum 4.22 GPM and a maximum power output at 110,000 BTU/hour!

If it was more power and more hot water you were looking for, look here.

It has a digital temperature display that makes everything easy for you to read no matter your lighting situation.

And it has a thermal efficiency of 88.5% which is pretty good when you’re out in the wilderness!

The dimensions of this model are 7.87 x 27.56 x 17.32 inches making it 3,757 cubic inches. It’s obviously larger than the last Camplux model and larger than a few of the other options on this list.

However, it’s weight of 36 lbs. makes it one of the lightest options and makes it very portable.

Another great option for camping, especially if your camping party has a few extra people.

Also, great for giving any pets a bath outside. Tell Fido not to worry… the hot water won’t run out mid bath!

Just like the Camplux 5L, you also get the safety features of flame failure device, anti-freezing protection and over-heating protection.

A safe choice, and a great choice!

If you’re looking for the most power in a portable camping model, the Camplux 16L might be your choice for the best outdoor tankless water heater in 2020.

 

 

REGIONAL INFO

With the Camplux 5L, it’s recommended not to be used above 2,000 feet, and the same goes for the 16L. This option is going to have all the same great usage situations.

Camping all across the country, Oklahoma, Nebraska, Tennessee, you name it. Music festival-goers at Coachella and others would love to have this excellent travel-mate!

And those on farms and with big yards and outdoor animals… Camplux came through with another incredible portable tankless water heater.

The difference with this one?

More power means your camping trip or your music festival adventure can invite more friends along as more can be served. The 16L is ideal for a party in these scenarios that’s a bit larger.

And though you can’t go any higher in elevation with this model, you can have more success a little farther north.

With a higher maximum GPM, ground water temperatures can be lower and you can still get the hot water you need!

So… camping trips in Oregon, Michigan, Washington, etc. will be much better served with the 16L.

And the same goes for those farms and those with outdoor animals running free on the property.

Montana, Maine, Minnesota, the Camplux 16L may be a better choice for giving baths to all your furry loved ones!

Pros

  • Fantastic portable option for bigger campsite/outdoor situations
  • More powerful and higher GPM than the previous model Camplux 5L
  • Includes fantastic safety features

Cons

  • Isn’t as small as the Camplux 5L
  • More expensive portable option
  • Isn’t recommended above 2,000 feet

Best Outdoor Tankless Water Heaters — Buyers Guide


So, now you’ve gotten a good fill of all the outdoor tankless water heater world has to offer you.

Which area entices you most?

There are some big questions which will obviously help you to narrow down your choices quite a bit.

Right off the bat, you likely want to make a decision on if you’re servicing a smaller to medium sized home, or if it’s for a larger home. Maybe it’s a very large home.

Perhaps portable is another keyword you want to incorporate into your search.

But furthermore, there’s lots of other little questions you need answered.

You may have had some of those questions prepared before reading this article or maybe this article clued you in that you did need to ask a few more questions.

I’m going to help you get all the answers you need. The details of all the different models is helpful, but the details only go so far if you don’t put them to good use.

So, let’s do just that. Let’s put all these details and facts to good use.

 

Here, I’ll go over some Frequently Asked Questions about outdoor tankless water heaters.

This way we can cover plenty of areas that you may be wondering about. And if your brother or your mother or your friend is reading this article… then we’ll cover areas they might be pondering as well.

Once we get some questions out there and pair them with some answers, you’ll have all the information you need to decide what the best outdoor tankless heaters are in 2020.

Let’s get some answers.

What are the best outdoor tankless water heaters in 2020 if I have a family of three on a budget?

If you live down south with ground water temperatures of 70 and up, the Eccotemp 45H-NG is the best choice on a budget.

If you live fairly south where the ground water temperature ranges in the 60’s, as long as it’s two showers at once and perhaps some other appliance, you can still go with the Eccotemp 45H-NG.

If you’re looking for three showers at once, choose either the Rinnai RL75eP or the Rheem RTG-95XLN.

In other regions with ground water temperatures in the 50s, the Rheem RTG-95XLN should be able to get three showers running in most areas.

For extra assurance, perhaps choose the Noritz NR98, especially if that ground water temperature is below 50s.

All other regions, ground water temperatures in the 40s… your budget option will be the Rinnai RU199 to run three simultaneous showers.

What are the best outdoor tankless water heaters in 2020 if I live at a high altitude?

High altitude areas like Denver, Salt Lake City, Tucson, Calgary, etc. your best choices will be the Rheem RTG-95XLN or the Rheem RTG-95XLP Professional Prestige.

The difference between the two is about $400. The latter costs more, but saves more energy and more money in the long run.

Either choice will work for you in your Mile High City or your city by the salty body of water, but you should likely decide if you want to save money now or save money in the long run.

For a Canadian family of three that typically runs two showers and a bathroom sink concurrently, what are the best outdoor tankless water heaters in 2020?

If you’re looking for something on a budget, the Rheem RTG-95XLN will be the cheapest option, but likely you would need one of those appliances to be either low-flow, or not the heaviest of flows.

Additionally, choose the Rheem RTG-95XLN or the Rheem RTG-95XLP Professional Prestige if you live in a higher altitude city in Canada like Calgary.

If you don’t want to compromise water flow, the Noritz NR98 is right on the border of getting that job done and is the next cheapest option.

If you want to be extra careful and make sure you have plenty of hot water to go around, or perhaps may want to swap that bathroom sink out for a kitchen sink or dishwasher… the Rinnai RU199 and the Rinnai RUR199 are perfect choices.

The Rinnai RU199 being the cheaper of the two.

What’s the cheapest outdoor tankless water heater in 2020 for small to medium-sized homes?

That would be the Eccotemp 45H.

What’s the cheapest outdoor tankless water heater in 2020 for large homes?

It is the Rheem 95XLN.

What’s the best budget outdoor tankless water heater in 2020 that’s also easily portable?

The Camplux 5L Outdoor 1.32 GPM.

What’s the best outdoor tankless water heater in 2020 that’s also easily portable?

That would be the Camplux 16L Outdoor 4.22 GPM.

What’s the OVERALL best outdoor tankless water heater in 2020 for small to medium-sized homes?

I would choose the Rinnai RL75.

What’s the OVERALL best outdoor tankless water heater in 2020 for large homes?

I would say the Rinnai RUR199 is the absolute best.

But if you have a somewhat large home, and maybe not the largest… you could save some money and still have the best among those for regular large homes with the Noritz NR98.

If me and my partner want the best outdoor tankless water heater to bring with us to our cabin, what would that be?

I would say, as long as your cabin is at 2,000 feet above sea level or lower, then choose the Camplux 16L.

If it’s at a higher elevation than that, ask yourself this question. Are you going to be spending a lot of time at this cabin, or more just an occasional vacation or two a year?

If this high elevation cabin of yours is something you visit occasionally, the cheaper Rheem 95XLN is a great choice.

If you plan on being at this cabin a lot, the more expensive, but cheaper over long periods of time, Rheem RTG-95XLP Professional Prestige would be an excellent choice.

What’s the best outdoor tankless water heater in 2020 if I want Wi-Fi capability?

The Rinnai RL75eP is the perfect choice for Wi-Fi capability in a medium-sized home.

Larger homes or homes at high elevations that want Wi-Fi capability… the Rheem 95XLN or the Rheem RTG-95XLP Professional Prestige have your back.

The absolute largest of homes that desire Wi-Fi capability… the Rinnai RU199 and the Rinnai RUR199 both can do that.

Best Outdoor Tankless Water Heaters — Conclusion

As long as you ask the right questions and follow some guidelines, you can’t go wrong with the options on this list.

Many of these models serve slightly different purposes. But if you came to this list looking for the best outdoor tankless water heaters in 2020, you found them!

The perfect one for you is listed somewhere above.

Everything you need to know to make this informed decision is here.

Are you small home? Large home? Camper?

Do the twins get ready at the same time as you and your spouse? Or are your schedules different from the little ones?

Do you run the dishwasher while multiple showers run? Or do hot water appliances all run at separate times in your household?

You know all the most important questions and most important answers to finally figure out, what are the best outdoor tankless water heaters in 2020.

Oh yeah… and do you want to control hot water direct from your phone like a futuristic king or queen?

That’s a very important question. No matter your answers, there are many options here for you!

Good luck!

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Mike has a PhD in Engineering and is currently a Scientist in an international research institute. He is 39 and loves researching about interaction of light with solid materials. Application of his research includes but not limited to solid state lighting, white-light emitting diodes (LED)photodetectors and optoelectronic devices

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