Best Tankless Gas Water Heater Review

Tankless water heaters are generally cheaper and much more cost-effective than the conventional water heaters that come with tanks. And this is why many homeowners would choose to have a tankless type over than the other variations.
But in choosing a tankless water heater, people are also torn between a gas and an electric variation. Although many would choose to buy an electric tankless water heater, some homeowners would want to have the best tankless gas water heater. And this is because such tankless water heaters have their own benefits and advantages as well.
Accordingly, numerous manufacturers are still producing them. And many are still facing challenges when choosing the right one for them.
So, if you are looking for the best tankless gas water heater, then this guide may be the one that could lead you to your next water heater!

Hot Picks for The Best Tankless Gas Water Heater

Most Budget-Friendly Unit
camplux propane tankless water heater
Camplux 5L Tankless Water Heater
It comes with an energy saving technology
Very portable and compact
Ideal for outdoor uses
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Most High-End Unit
rheem rtgh-95dvln
Rheem RTGH-95DVLN
Very powerful and efficient unit
Innovative features
Ideal for large properties
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Most Powerful Unit
rinnai ruc98in ultra series
Rinnai RUC98iN Ultra Series
User-friendly water heater
Great and pleasant customer service
Heavy-duty water heater
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The 9 Best Tankless Gas Water Heater

In this guide, we have included some of the most top-rated units of today. In fact, these tankless gas water heaters are seen as today’s best units.

1) Camplux 5L 1.32 GPM Outdoor Portable Propane Tankless Water Heater

Quick Summary

Power: 34000 BTU/Hour
Capacity: 1.32 GPM
Dimension: 11.42 x 4.33 x 14.8 inches
Battery Life: 180 days
Temperature Rise: +46.4 up to +114.8 degrees Fahrenheit
Warranty: n/a
Price: Below $150
The Camplux 5L Outdoor Portable Propane Tankless Water Heater is one of the most versatile water heaters of today. With its portable size and structure, users can bring it anywhere and anytime.
It is also quite safe to use. With its flame failure, oxygen depletion, anti-freezing, and safety shut-off protection features, users can ensure the overall safety and security upon using this water heater.
Review:
“This heater is awesome. If you have the water pressure you can take a drenching shower with lots of pressure. As well as low pressure.”
PROS
It comes with an energy saving technology
Very portable and compact
Ideal for outdoor uses
CONS
The warranty terms are not specified
Not very durable
Customer support is not very efficient

2) Eccotemp FVI-12-LP Gas Tankless Water Heater

Quick Summary

Power: n/a
Capacity: 3.6 GPM
Dimension: 28 x 17 x 10.5 inches
Battery Life: n/a | 120V Plug-In
Temperature Rise: +55 degrees Fahrenheit
Warranty: 2 years
Price: Below $300
The Eccotemp FVI-12-LP Gas Tankless Water Heater is quite an energy-saver. This is because it only runs when the heater is turned on. But even so, it still produces hot water instantly.
Although the temperature rise is only rated at 55 degrees Fahrenheit, many users still prefer this gas water heater over others due to its safety and innovative features. Plus, it comes with a digital temperature display to monitor the overall functions of the unit.
Review:
“It's very quiet, ignites instantly when it senses water flow. The fan continues to run for 5 or 10 seconds after the flame is stopped.”
PROS
Ideal for indoors
It comes with a digital display
Very quiet
CONS
Poor warranty term
Ineffective customer service
Installation is difficult

3) Rheem RTGH-95DVLN

Quick Summary

Power: 199000 BTU
Capacity: 9.5 GPM
Dimension: 18.5 x 9.8 x 27.5 inches
Battery Life: n/a | 120V Plug-In
Temperature Rise: Up to 120 degrees Fahrenheit
Warranty: 12 years
Price: Below $1500
The Rheem RTGH-95DVLN is one of the most powerful tankless gas water heater in this list. With its capacity of 9.5 GPM, it can actually supply a constant 120-degree Fahrenheit of water temperature in a 4-bedroom property.
This tankless gas water heater also comes with a self-diagnostic system that can help the users with the installation and the overall functionality.
Review:
“This unit does provide very hot water. The incoming water is ice water cold - the delay to get hot water at the tap is only slightly longer than it was from the old tank one.”
PROS
Very powerful and efficient unit
Innovative features
Ideal for large properties
CONS
Expensive
Ineffective warranty terms
Poor customer service

4) Takagi T-KJr2-IN-NG

Quick Summary

Power: 140000 BTU
Capacity: 6.6 GPM
Dimension: 20.3 x 13.8 x 6.7 inches
Battery Life: n/a | 120V Plug-In
Temperature Rise: Up to 167 degrees Fahrenheit
Warranty: 10 years on heat exchanger, 5 years on parts
Price: Below $750
The Takagi T-KJr2-IN-IG unit is a small yet powerful gas water heater. It is very much ideal for small spaces with two to three water outlets to be subjected on the heater.
It’s easy to use and easy to install. But keep in mind that installing this unit on your own may lead to the loss of its warranty terms. So, be careful when you are trying to install and assemble the unit on your own.
Review:
“The first thing when you get this is the fact that its small and light. It's a feat of engineering that you are able to get 6+ gallons per min of perfectly hot water from this unit without end.”
PROS
Ideal for small spaces
Portable and compact
Energy-conservative
CONS
The warranty term is quite tricky
Not very durable
The design is not too pleasing

5) Eccotemp L10 2.6 GPM Portable Tankless Water Heater

Quick Summary

Power: n/a
Capacity: 2.6 GPM
Dimension: 25.5 x 13.625 x 7 inches
Battery Life: 60 to 120 days
Temperature Rise: 50 up to 140 degrees Fahrenheit
Warranty: 1 year on the heating element
Price: Below $250
This tankless gas water heater from Eccotemp is great for outdoor uses. Whether you are looking for a unit for camping purposes or outdoor showers, the Eccotemp L10 is a great one to purchase.
It is very lightweight, compact, and portable. It is actually powered by two D cell batteries. But, you may need to purchase them separately as the package does not include them.
Review:
“there is some temp fluctuation when the shower and kitchen sink are running simultaneously, but not extreme. - However when only one fixture is being used the hot water is endless.”
PROS
Portable and easy to carry
It comes with a safety shut-off timer
Easy to use
CONS
There are some issues with its hot water outlet
Poor warranty terms
Poor customer service

6) Rinnai RUC98iN Ultra Series

Quick Summary

Power: 199000 BTU
Capacity: 9.8 GPM
Dimension: 18.5 x 26 x 10 inches
Battery Life: n/a
Temperature Rise: 98 up to 185 degrees Fahrenheit
Warranty: 12 years on heat exchanger, 5 years on parts, 1 year on labor
Price: Below $2000
The Rinnai RUC98iN Ultra Series is one of the most powerful and expensive tankless gas water heaters in this guide. With its capability to increase the water temperature up to 185 degrees Fahrenheit, users can really expect instantaneous hot water.
Also, this gas water heater meets all California and Texas NOx Emissions Standards. Hence, every user can ensure the safety and security of the environment. Plus, the unit can be fully controlled using the Rinnai Digital Controller.
Review:
“There is a slight drop in water pressure. I noticed on my dual head shower, but not on the water saving heads. No issues running two showers at the same time. It's very quiet. Support from Rinnai was fantastic and answered all my questions within a few minutes of calling.”
PROS
User-friendly water heater
Great and pleasant customer service
Heavy-duty water heater
CONS
Expensive
It takes time to heat water
It has apparent issues with the ignition

7) Takagi T-K4-OS-NG

Quick Summary

Power: 190000 BTU
Capacity: 8.0 GPM
Dimension: 13.8 x 20.3 x 8.5 inches
Battery Life: n/a
Temperature Rise: 99 up to 167 degrees Fahrenheit
Warranty: 5 years on heat exchanger, 3 years on parts, 1 year on labor
Price: Below $1000
The Takagi T-K4-OS-NG is a powerful tankless gas water heater. But while many find the appearance of the unit as an unpleasant one, this unit is supposed to be installed outdoors. Hence, it does not fully affect the appearance of the bathroom or the interiors.
Even so, the functionality of the unit is on point. Plus, it really helps cut down the energy costs of every user. Moreover, Takagi water heaters really last for more than 5 years.
Review:
“We had a takagi tankless water heater in our home for the past 11 years and it's worked flawlessly. We needed to replace it due to a leak.so we stayed with a brand that has served us well.”
PROS
Very durable
Designed for heavy-duty purposes
Easy to use and easy to install
CONS
Tricky warranty terms
Lacks innovative features
The overall design is not entirely pleasing

8) Noritz NRC661-DV-NG Indoor Condensing Direct Tankless Hot Water Heater 6.6 Gpm-Natural Gas

Quick Summary

Power: 120000 BTU
Capacity: 6.6 GPM
Dimension: 13.8 x 23.6 x 7 inches
Battery Life: n/a
Temperature Rise: 120 degrees Fahrenheit
Warranty: n/a
Price: Below $1000
Many see the Noritz NRC661-DV-NG Indoor Condensing Tankless Water Heater as an expensive unit due to its cost. But, keep in mind that the materials used in its construction are all fine and durable which explains its overall cost.
This water heater features endless hot water and consistent temperature in its output. And these are all found to be very effective.
Review:
“Excellent water heater. No worries and can use all the hot water I need. It does take a little time to get used to waiting a few minutes for the water to heat up, but mine is located directly below the kitchen so it isn't very much of a wait”
PROS
Endless water heater
Consistent hot water
Quiet operation
CONS
Slight footprints
Quite expensive considering its features
Ineffective warranty terms

9) Rheem RTG-84XLN 8.4 GPM

Quick Summary

Power: 180000 BTU
Capacity: 8.4 GPM
Dimension: 14 x 26 x 10 inches
Battery Life: n/a | 120V Plug-In
Temperature Rise: +35 degrees Fahrenheit
Warranty: n/a
Price: Below $1000
The Rheem RTG-84XLN Tankless Gas Water Heater is, in some way and somehow, a close competitor of the Noritz and Takagi tankless water heaters. And for some reason, many would prefer this water heater from Rheem than other ones from the average range.
Some possible reason would be its compact and small build. And this is because while it is very portable and compact, this water heater is found to be very powerful. As a matter of fact, a lot of users would attest that this is ideal for homeowners who want a heavy-duty tankless gas water heater.
Review:
“Overall it is a wonderful product, highly recommended, I think its a thousand times better than Takagi which was my old one. Thanks Rheem!”
PROS
Portable and compact
Durable
No venting required
CONS
Gas leakages are very apparent
Ineffective warranty terms
There is always a water bill increase

Things To Consider Before Buying A Tankless Gas Water Heater

Buying a tankless gas water heater is not entirely the same when you are purchasing a tankless electric type. And this is because these two types differ in so many aspects.
So, before you head out and make your purchase, here are some of the things that you must consider first:

1. Is Your Home A Tankless Gas Water Heater-Friendly?

These water heaters have a lot of concerns when it comes to safety. But keep in mind that it is not to say that these types are dangerous. This can only mean that there are additional factors that you may need to regard first.
Before buying a tankless gas type, you must ensure that your home or chosen property is suitable for this type of water heater.

Proper Ventilation

A home is suitable for a tankless gas type if it has the right and proper ventilation. Keep in mind that these water heaters need enough space for ventilation because this system allows the unit for the combustion to take place in a safe way.

Without having a proper and enough air flow, combustion may not occur and the unit would then fail to function. Or worse, it may lead to accidents.

Access To Gas Supply

Another important factor to consider is if your property has the right access to the right gas supply. It is important for you to take note that not all traditional gas lines are appropriate for tankless gas water heaters.

And if you do not possess the right access or supply, you may need to look or create for another efficient gas source.

2. Do You Need A Much Powerful Output?

Tankless gas water heaters have the capacity to accommodate more than 8 gallons per minute. At this rate, it only means that unit must be powerful enough. And when you have this kind of requirement, then it is only fitting that you get a tankless gas type.

On the other hand, if you do not need this kind of power, might as well consider for other types of water heaters.

3. Is Cold Weather An Apparent Condition In The Area?

If your property is situated in a location where there is an apparent cold weather condition, then a tankless gas water heater is a must. This is because these units are designed for this kind of weather condition. Accordingly, a tankless electric type may not be suitable.

The Best Among All The Units

Out of the 10 tankless gas water heaters given, only one unit stands out the most. And this is the Noritz NRC661-DV-NG Indoor Condensing Direct Tankless Hot Water Heater 6.6 Gpm-Natural Gas.
Primarily, this unit is very durable. All of the materials used in its structure are all from the finest qualities. Secondly, users of this unit experience endless hot water supply. Hence, this means that there is no abrupt interruption with the supply, unlike other units. And thirdly, this unit functions very quietly.

So, if you are looking for these kinds of qualities in a tankless gas water heater, then this might be the best option for you.

But even so, try to still regard the essential matters at hand before deciding. In the end, you are the only one who can decide whether a certain unit will work best for you or not.
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