Best Gas Water Heater Reviews

So you have heard about tankless water heaters and you are thinking about getting one because it will save you money, right? Before you make your decision there are still some things you need to know. Well, you have definitely come to the right place, as we have everything you need to know about purchasing the right tankless water heater for your home.

The first consideration that must be taken when shopping for a new gas water heater is the setup that already exists in your home. Many of the new gas water heaters require nearly 200k BTU to heat the water appropriately. This is especially true if you are looking at tankless water heaters right now. Most homes are not setup to have natural gas come through at that level. This means a costly upgrade may be necessary to get the desired water heater installed.

Fuel options are also an important consideration with these water heaters. Use the gas water heater reviews to determine if the equipment runs on natural gas, propane, or another fuel. Some gas water heaters are designed to work outdoors because of their fuel source, while others may need to have specific exterior venting installed so that they have proper levels of combustion. Accommodating these needs after a purchase can be a surprise expensive that sometimes may be more than $1,000.

A final consideration is to consider whether or not you want to have a tankless hot water system. Tankless systems can provide unlimited hot water, which is perfect for those who live to linger in a shower for long periods of time. Tankless models also save on energy costs, but the down side is that there is never hot water available in the home until the faucets turn on and the equipment activates.

The Best Gas Water Heaters

RankImageWater HeaterMax BTU (Power)PriceRating
1Takagi T-KJr2-IN-NGTakagi T-KJr2-IN-NG140,000$$$$4.7
2Rheem RTG-64XLNRheem RTG-64XLN 150,000$$$$5.0
3Rheem RTGH-95DVLNRheem RTGH-95DVLN199,000$$$$$4.6
4Rinnai RU98INRinnai RU98IN199,000$$$$$4.1
5Eccotemp L10 HighEccotemp L10 High74,500$$4.0
6Rheem 22V50F1Rheem 22V50F138,000$$$4.0
7Rinnai RL75iNRinnai RL75iN180,000$$$$3.8
8Rinnai RL75eNRinnai RL75eN180,000$$$$4.1
9Takagi T-H3J-DV-N Condensing High EfficiencyTakagi T-H3J-DV-N Condensing High Efficiency160,000$$$5.0
10Rheem RTG-64XLPRheem RTG-64XLP150,000$$$$4.5




The #1 reason to look at a gas water heater is portability. Although natural gas water heaters are designed for a permanent installation, the same is not true of propane-fueled water heaters. With a 20-gallon tank, the same that many use for a gas grill, a barn, an RV, or even a boat can have hot water on demand with today’s technology. They can even be hooked up to pressure washers so you can have a hot high-powered stream of water for sanitizing patios, decks, and driveways.

Gas water heaters that are regulated by flow algorithms are also extremely energy efficient. With flow rate triggers between 0.26 – 0.40 gallons per minute on most water heaters, you’ll only engage the fuel source when you need hot water. This “pay as you go” type of system can save between 15-60% on utility costs every month depending on your household’s habits.

This means many of the best gas water heater options today will eventually pay for themselves. Look at it this way: if your $1,000 new tankless water heater saves you $40 per month in utility costs, then it will pay for itself in about 26 months. In the meantime, you’ll also have unlimited hot water at your disposal.



Gas water heaters stand out because of their efficiency, both in terms of cost and design. They are cost effective in the sense that they use on-demand technology which allows the machine to only work while a hot water valve is turned on. Once you turn off the valve the water heater shuts off by itself. This puts the machine at rest for approximately 90% of the time. Estimated savings show that one could cut their utility bill in half every month by switching to tankless water. There is also a federal credit of $300 which consumers can receive for switching.



Tankless water heaters are small with most being around the size of a medicine cabinet. As such they do not take up too much space and can fit in a closet, under your sink, in a crawl space, in an attic or any other small area in your home where you have the space. Even in a home where there is limited space or in a small apartment one can easily find space for one of these small tankless water heaters.



Tankless water heaters provide hot water on demand and almost instantaneously as well as provide an unending supply of water. Therefore, there is no need for anyone to run to the shower to ensure the hot water doesn’t finish on them. Over the years the design of these machines has been upgraded to ensure they have fewer problems than their predecessors. There is no issue of short bursts of cold water. Since there is no tank, there is no risk of rupture so your water heater will continue to be reliable for in excess of 20 years.



All tankless water heaters are more environmentally friendly than their predecessors. With everyone trying to cut down on emissions, the manufacturers of tankless water heaters have mastered this craft. Thanks to the on demand technology, tankless water heaters use minimal energy, which is a key step in helping the environment. Greenhouse gas emissions are minimal in gas models and electric models give off no emissions whatsoever. There are even manufacturers that produce only models that are environmentally friendly.


  • Gas, Electric, or Propane. When deciding which type of heater you need, you have to think about your area’s climate. You need a heater that will be powerful enough to heat the water if you live in a cold climate, and for such a climate a natural gas or a propane heater will work well. Electric models lose a lot of GPM when there is the need to rise the water temperature too high. If you are not into a propane or gas unit you will have to look at the British Thermal Unit (BTU) of the model you are interested in. A higher BTU means the machine has the ability to heat the water to higher degrees. If you choose propane, you will need a space that has proper ventilation and which is readily available.
  • Size. The size you decide to go with is also dependent on how much you have to heat your water. You can find out what the average water temperature in your area is. You can also check your water temperature yourself. You will need to ensure you have a size that will heat your water enough to ensure that you don’t lose GPM – gallons per minute. 
  • GPM. We mentioned GPM in the two prior points, but what exactly does gallons per minute mean? This is a measurement that tells you how much water your unit can heat. You need to know this to ensure that you never lose hot water when the demand for it is great. You can find information online about the GPM of different activities and appliances that use hot water. Total this up and determine how much GPM you need your ideal tankless water to yield.  The main issue that trips up shoppers of gas water heaters today is the flow rate that comes from the equipment. The cheapest models typically have a 4.0 GPM capacity. This means a home can have 2-3 faucets on at the same time for hot water use at most. Although most people won’t have three bathroom faucets running simultaneously, there could be a washing machine, a dishwasher, and a shower-taking place. On entry-level equipment, that means the hot water will be tapped out.
  • Brand. If all the technical stuff wasn’t hard enough, there is now the need to filter by brand. You may have some sort of brand loyalty as many consumers these days do. There are a number of brands out there to choose from. You will find names that manufacture many of the other appliances in your home as well as you may find brands that only manufacture heaters and even those that only offer tankless water heaters. Once you choose the right fuel, the right size, and the right GPM for your needs, the brand all comes down to what you prefer.