Best Tankless Gas Water Heaters

Best Tankless Gas Water Heaters

Last Updated on by Daniel Lawrence

Welcome to our review of the best tankless water heaters . Picking the best gas water heaters can be somehow difficult especially when you’re not conversant with the types available. To make it easy and straightforward when shopping for gas water heaters, we’ve researched, tested and reviewed the best tankless water heaters available in the market.

So, if you’re looking for the best tankless water heaters either for commercial or personal use, you just found the right place.

However, before picking any of these water heaters of your choice, a portion of the crucial aspects that you ought to consider are highlighted below.

Buyers Guide: Things to Reasons To Avoidider When Buying a Gas Tankless Water Heater

Before you purchase a gas tankless water radiator, You need to take a ton of things into thought before having the option to state that you at long last found the ideal fit for your home.
Regardless, we are here to respond to each inquiry you may pose to when purchasing a gas tankless water heater.

Power Input: Regarding tankless water heaters, power and size are moderately equivalent, in a manner of speaking. For instance, you will require a water heater with a size that can offer your family unit enough high temp water.

What’s more, you will require a model that is ground-breaking enough to viably expand the water temperature and carry it to what you and your family need. To put it plainly, you need to ensure that the water is sufficiently hot to fulfill both your needs and desires.

To ensure you pick the correct water warmer, think about this – the more power, the better. For instance, little spaces will require as meager as 10,000 BTUs, while enormous – or business – ones may require as high as 1,000,000 BTUs.

Flow Rate: The power contribution of the heater handles the correct temperature. Stream rate, then again, is the thing that decides the measure of water the radiator can convey to you.

The stream rate ought to be picked by what number of gadgets you have in your home or you need to control. For instance, on the off chance that you need to supply a solitary fixture with heated water, at that point, a stream pace of 1 GPM ought to be sufficient.

Notwithstanding, in the event that you need to supply the entirety of your water-based apparatuses – or your whole home – with moment high temp water, at that point you will require a radiator prepared to do something beyond two or three gallons for every moment.

Venting: Clearly, venting is a significant piece of each indoor gas water heater. be it tankless or with a tank. The radiator dispenses with perilous gases that must be wiped out and afterward expelled from the property.

In addition, a venting system will guarantee extra home admission from the outside, if important. Gas tankless water radiators ordinarily accompany two venting alternatives:

  • Power Venting –this kind of venting requires a fumes pipe. Before you install such a venting, ensure that the establishment region has a natural air circuit.
  • Direct Venting –this kind of venting requires a fumes pipe, just as an admission pipe. The fumes pipe disposes of all carbon monoxide and unsafe gases, while the admission pipe guarantees adequate air consumption.

Energy Factor: The energy factor of each gas tankless water radiator can assist you with ascertaining the unit’s energy productivity. Fundamentally, you will adapt more data about the radiator’s normal expense of activity.

Other features: Normally, you will need an item from a legitimate brand. That these last longer as well as guarantees the way that the producer will regard the guarantee. There have been a few cases where certain brands apparently gave a valiant effort to invalidate a client’s guarantee.

In addition, you will need to focus on affirmations. For instance, in the event that you need to introduce the warmer in a manufactured house, you may require certain grants, contingent upon the state.

Finally, on the off chance that you want expanded accommodation, you might need to purchase a model with an indoor regulator and remote control.

Best Tankless Gas Water Heaters That We Tested

Name Features Where to Buy

Rinnai RUC98iN Ultra Series Natural Gas Tankless Water Heater


Dimensions10 x 18.5 x 26″

Weight82 pounds

Flow Rate: 9.8 GPM


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Rheem RTGH-95DVLN Indoor Direct Vent Tankless Natural Gas Water Heater


Dimensions18.5 x 9.8 x 27.5″

Weight79 pounds

Flow Rate9.5 GPM


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Rinnai RUC98iP Ultra Series Propane Tankless Water Heater


Dimensions10 x 18.5 x 26″

Weight82 pounds

Flow Rate: 9.8 GPM


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Eccotemp i12-NG Tankless Water Heater


Dimensions16 x 16 x 11″

Weight28.9 pounds

Flow Rate3 GPM

BTU25,000 – 80,000

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excell tankless

Dimensions18 x 7 x 14″

Weight20 pounds

Flow Rate: 1.6 GPM


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Gasland BE158 1.58GPM 6L Outdoor Portable Gas Water Heater


Dimensions: 11.8 x 6.1 x 17.3″

Weight15.5 pounds

Flow Rate: 1.58 GPM


 Get it on Amazon

Best Tankless Gas Water Heaters in Efficiency

Rinnai Ultra


Dimensions10 x 18.5 x 26″| Weight82 pounds| Flow Rate: 9.8 GPM| BTU199.000

The primary item on our rundown is the Rinnai RUC98iN, which is one of the best tankless gas water heaters of all time. Allegedly, it is another model from this producer, equipped for conveying more proficiency to its clients. The item itself is imported, with a concentric model and with the alternative of a PVC venting. With regards to looks, this tankless water heater has a smooth structure with a metallic completion.

It fits best with apparatuses that have a similar silver finish.on top of that, its plan is likewise space-saving, subsequently enabling the radiator to be installed inside. It includes up to 0.96 Energy Factor and up to 0.92 Uniform Energy Factor. Purportedly, the item has ultra-low NOx discharges and is fit for up to 199,000 BTU.

Reasons To Buy Reasons To Avoid
Ultra-low NOx emissions Concentric exhaust requires additional OEM parts
Up to 0.96 Energy Factor
95% Thermal efficiency

Rheem RTGH


Dimensions18.5 x 9.8 x 27.5″| Weight79 pounds| Flow Rate9.5 GPM| BTU199.000

Another top-notch gas tankless water radiator from Rheem is the Rheem-RTGH which is one of the most famous – and best – water heaters available. The item accompanies something each purchaser would need to hear – 94% energy effectiveness. What’s more, the radiator has its consolidating heat exchanger produced using hardened steel, thus the energy effectiveness coefficient.

It additionally includes astute electronic controls, which are uniquely intended to expand the radiator’s energy effectiveness, just as security. This particular model is, as detailed by the producer, a low NOx rendition – thus, you don’t have to stress over any hurtful outflows. The radiator is perfect with a two-pipe direct vent system that is intended for PVC pipe.

Reasons To Buy Reasons To Avoid
It has a digital remote control Max water temp of 120
94% energy efficiency Low flow turn on
Built-in electric blower

Best Tankless Gas Water Heaters Price



Dimensions10 x 18.5 x 26″| Weight82 pounds| Flow Rate: 9.8 GPM| BTU199.000

This is the second water warmer on our rundown from Rinnai, yet this one uses propane rather than flammable gas. The model highlights a similar silver/metallic complete the process of, making it appropriate for territories that offer similar colors– or only for your cellar. The item accompanies a maximum BTU of 199,000 and with an up to 0.96 energy factor.

What’s more, it has practically no NOx outflows, because of some exceptional innovation it utilizes. Regarding venting, it highlights choices for both PVC or concentric venting. It accompanies a 12-year old guarantee on the heater exchanger, 5-year on parts, and 1-year on work, with the alternative to expand it to 5 years.

Reasons To Buy Reasons To Avoid
A flow rate of 9.8 GPM Some customers claimed that it takes up to one minute for hot water to reach their faucets.
199,000 max BTU
Ultra-low NOx emissions

Eccotemp i12-NG


Dimensions16 x 16 x 11″| Weight28.9 pounds| Flow Rate3 GPM| BTU25,000 – 80,000

Eccotemp has a water heater with an extremely lovely design. Smooth and modern, this tankless water heater could be put anyplace in your home. Its front board is made of dark safety glass which has LED display controls too. Kitchen or anteroom – it would be an ideal fit! The heater is entire house and evaluated at 3 GPM, which actuates just on-request and it doesn’t require any pilot light.

Along these lines, this item can assist you with decreasing energy utilization. What’s more, the completely programmed temperature controls have an energy-saving mode also – other than the kid lock innovation. This makes for an energy effective item. Safety is guaranteed with the assistance of the safe electronic start system.

Reasons To Buy Reasons To Avoid
If features LED display controls The exhaust can get quite hot
It is energy efficient
3 GPM flow rate

Best Tankless Gas Water Heaters in Portability


excell tankless

Dimensions18 x 7 x 14″| Weight20 pounds| Flow Rate: 1.6 GPM| BTU38,000

This unit from Excel deals with LPG propane gas and it doesn’t require a pressurized pump. As promoted by the maker, the water heater beginnings with 2 PSI of water pressure. Strikingly, this item doesn’t require any venting. Because of without vent innovation, you will require no costly pipe.

In addition, the heater’s heat exchanger is produced using unadulterated copper and accompanies a lifetime guarantee. The producer likewise dispatches a free LPG flare metal connector for the gas controller with the acquisition of this item.

Reasons To Buy Reasons To Avoid
It is easy to install The product cannot handle any temperatures below freezing.
Pure copper heat exchanger
Free flare brass adaptor



Dimensions: 11.8 x 6.1 x 17.3″| Weight15.5 pounds| Flow Rate: 1.58 GPM| BTU41.000

Our last section is the outdoor compact gas water heater from Gasland. So, it accompanies a ton of highlights! As a matter of first importance, we have a different safety system set up, for example, a fire fighting gadget, liquid catalyst insurance, just as overheating security. On the off chance that the water pressure goes over 110 psi, the warmer will consequently diminish it to guard things.

It includes a lightweight and minimized structure, making the item simple to convey and mount. The back and the highest point of the radiator highlight mounting sections that can be utilized to install it in merely minutes. Regarding energy reserve funds, the principle burner and the propane water radiator exchanger are designed with cutting edge ignition innovation so as to diminish consuming noise, just as gas utilization.

Reasons To Buy Reasons To Avoid
It has several safety systems in place The instruction manual doesn’t refer to the use of the product’s front dials.
It features a lightweight, compact design
Fully adjustable water and heat flow.

How We Picked

We relied on the opinion of experts and feedback based on three major factors: Price, Portability & Efficiency.

More facts and data about these tankless gas water heaters were gotten from deep research and online reviews. With the result and feedback we got, we were able to rank each product according to the standard we set.

Looking at our review, tankless gas water heaters have been carefully categorized according to our research results. Also, take note that the heaters that didn’t meet our standard were not included among this list.

Frequently Asked Questions

Which is better electric or gas tankless water heater?

A tankless electric heater is for the most part less expensive than a propane tankless warmer. It is imperative to remember that electric tankless water heaters are by and large 99%+ warm productive, though the effectiveness rating of most gas tankless radiators, even the better quality units, ranges from around 80 to 85%.

Does tankless water warmer utilize more gas?

Tankless water heaters can avoid the backup heat misfortunes related to storage water heaters. Be that as it may, although gas-fired tankless water heaters will, in general, have higher stream rates than electric ones, they can waste energy in the event that they have an always consuming pilot light

Do tankless water heaters run out of hot water?

indeed, there’s a drawback to this. In spite of the fact that a tankless system can’t run out of heated water, it can be overpowered with the request. On the off chance that more than one tap is on-demand for hot water at a similar time, in any case, for example, different showers or a running washing machine, the water radiator will struggle to keep up and deplete additional power.


If you’ve read this review, it implies you’re searching for a tankless gas water heater for home or commercial use and we believe you must have found one or two among our list that suits you in terms of price, performance, and compactness.

Be that as it may, we suggest that you take as much time as is needed before settling on your choice with the goal that you make certain of what you need. Ensure you check all the necessary specifications (especially the pros and cons) mentioned above before you purchase.