Tankless Water Heater Reviews

With the cost savings and technology constantly improving in tankless water heaters, thousands of people across the world are making the switch every day. In our tankless water heater reviews, we show you direct savings in both price of renting or owning a water tank, as well as energy cost savings of only heating water you need, as oppose to constantly keeping a fixed amount of water heated at all times. The downfall of tankless water heaters of course can be the flow rate, that is, the ability to run multiple faucets at one time with high temperatures. However, there are units in the market that can heat multiple outputs at once, even in large luxury homes.

The Best Tankless Water Heater Reviews

Tankless Water Heaters come in two varieties: electric and natural gas. Natural gas water heaters generally have the highest flow rates and heat for the lowest cost. That said, you will require a natural gas line and accept that your power source is emitting CO2 which can be eliminated with a solar/electric setup. Electric water heaters generally have lower flow rates and can cost more per gallon of heated water. For more information, read our article on choosing between Electric vs Natural Gas Tankless Water Heaters.

The Best Natural Gas Tankless Water Heaters

If you are looking to heat water for an entire house with a single unit for the lowest possible cost, a natural gas tankless water heater is for you. The following three heaters are our top picks in the natural gas category.

The Best Natural Gas Tankless Water Heaters

Name/Image Learn MoreBrandRatingPower SourceUse TypeCapacityType
Rinnai RUC98iN Ultra Series Tankless Water Heater Review

Rinnai RUC98iN Ultra Series Tankless Water Heater Review

view pricefull review Rinnai5 Star Average Rating Natural GasIndoor9.8 GPMTankless
Rheem 9.5 GPM Tankless Natural Gas Water Heater Review

Rheem 9.5 GPM Tankless Natural Gas Water Heater Review

view pricefull review Rheem4.5 Star Average Rating Natural GasIndoor9.5 GPMTankless
Rheem 8.4 GPM Low NOx Tankless Water Heater Review

Rheem 8.4 GPM Low NOx Tankless Water Heater Review

view pricefull review Rheem4 Star Average Rating Natural GasIndoor8.4 GPMTankless

Rinnai RUC98iN Ultra Series Natural Gas Tankless Water Heater

The Best Tankless Water Heater

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The Rinnai RUC98iN Ultra Series is the best of the best in residential natural gas tankless water heaters. Rinnai is an industry leader and premium brand in the market place and are generally more expensive than some of the lesser known brands. This tankless heater can produce the market leading flow rate of 9.8 GPM, which for some context is capable of simultaneously heating 3 showers at one time, or two showers and a heavy appliance, which is more than enough for nearly every home in North America. You cannot go wrong by buying the best of the best if you are willing to pay a few hundred dollars more up-front for that luxury.

The Pros

  • Can meet nearly any capacity need
  • Produced by an industry leader in water heaters
  • Hassle Free Warranty Process
  • No Expansion Kit Required
  • Very Silent
  • Dual Pipe makes unit more efficient by using condensation water

The Cons

  • Most expensive unit you will find for residential use
  • Requires venting and does not come with a venting kit
  • Might be excessively powerful for smaller homes

If you are looking for a water heater that will last you as long as possible, is from a trusted brand and capable of meeting virtually any hot water need, then this is the right natural gas tankless water heater for you.

Rheem RTGH-95DVLN 9.5 GPM Indoor Direct Vent Tankless Natural Gas Water Heater

Rheem RTGH-95DVLN 9.5 GPM Indoor Direct Vent Tankless Natural Gas Water Heater

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The Rheem RTGH 9.5 GPM Tankless Water Heater is the next best thing to the Rinnai RUC98iN for Natural Gas with direct vent. Rheem is another industry leader and premium brand in the market but is more competitively priced than Rinnai, generally speaking. With 9.5 CPM capacity, this can easily provide water heating to the average home in North America, regardless of incoming water temperatures, including up to 3 showers simultaneously.

The Pros

  • Can meet nearly any capacity need
  • Produced by an industry leader in water heaters
  • Very Silent
  • Dual Pipe makes unit more efficient by using condensation water

The Cons

  • Requires venting and does not come with a venting kit
  • Might be excessively powerful for smaller homes

If you are looking for a high quality, powerful unit without spending the absolute top dollar, then this natural gas tankless water heater for you.

Rheem 8.4 GPM Low Nox Direct Vent Tankless Natural Gas Water Heater

Rheem RTG-84DVLN 8.4 GPM Low NOx Direct Vent Tankless Natural Gas Water Heater

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The Rheem 8.4 GPM NOx Direct Vent is the most suitable water heater for the majority of homes. With 8.4 flow rate, you can heat two showers simultaneously, which will meet the needs of the average household. This model is backed by Rheem, an industry leader in water heaters, this is their most popular model and a best seller in America.

The Pros

  • Can meet nearly any capacity need
  • Produced by an industry leader in water heaters
  • Hassle Free Warranty Process
  • No Expansion Kit Required
  • Very Silent
  • Does not require venting

The Cons

  • Less Efficient than the double pipe
  • Requires venting and does not come with a venting kit

If you are looking for a hassle free, solid and most importantly, the right choice for the average home, then the Rheem 8.4 GPM Low NOx Direct Vent Tankless Natural Gas Water Heater is the right choice for you.

The Best Electric Tankless Water Heaters

If natural gas isn’t an option for you, or you would prefer a more eco-friendly approach (assuming you use solar power), you can choose an electric tankless water heater. The flow rates of the electric tankless model are significantly less than their natural gas counter-parts, and may often times require multiple heaters to satisfy the hot water needs of an entire home. That said, they are much less expensive up-front, smaller and easier to install.

The Best Electric Tankless Water Heaters

Name/Image Learn MoreBrandRatingPower SourceUse TypeCapacityType
BOSCH Tronic 6000 C Electric Tankless Water Heater Review

BOSCH Tronic 6000 C Electric Tankless Water Heater Review

view pricefull review BOSCH4 Star Average Rating ElectricIndoor2.3 GPMTankless
SioGreen IR260 Electric Hot Tankless Water Heater Review

SioGreen IR260 Electric Hot Tankless Water Heater Review

view pricefull review SioGreen4.5 Star Average Rating ElectricIndoor1.5 GPMTankless
EcoSmart ECO Electric Tankless Water Heater Review

EcoSmart ECO Electric Tankless Water Heater Review

view pricefull review EcoSmart3.5 Star Average Rating ElectricIndoor3.5 GPMTankless

BOSCH Tronic 6000C Electric Tankless Whole House Water Heater

BOSCH Tronic 6000 C Electric Tankless Whole House Water Heater

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The BOSCH Tronic 6000C is the undisputed most powerful electric tankless water heater available on the market today for residential use. While BOSCH markets it as a whole house water heater, it is likely the average house would require one of these heaters for every floor of the house. That said, it is still the best electric tankless water heater you will find, where other electric units would require 2 or more per floor, sometimes even one per faucet.

The Pros

  • Best in class flow rate
  • 97% efficiency – best in class
  • Backed by a 10 year warranty

The Cons

  • Most expensive unit you will find for residential use
  • Does not actually heat a whole house

If you are looking for the best in class electric tankless water heater, this is the right one for you!

SioGreen IR260 POU Infrared Electric Tankless Water Heater

SioGreen IR260 POU Infrared Electric Hot Tankless Water Heater

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Touted as one of the most innovative electric tankless water heaters available, the SioGreen IR260 is one of the only units that doesn’t build up any limescale or calcium, thanks to the innovative materials used by SioGreen. Even with this innovation, there are also able to produce a very strong 1.5 GPM of hot water which is suitable for a single faucet, appliance or low-flow shower head. At a very reasonable price and being completely maintenance free, this is one of the best electric tankless water heaters you can find.

The Pros

  • Virtually maintenance free
  • Very knowledgeable and helpful support staff
  • Innovative materials eliminate calcium and limescale

The Cons

  • Modest flow rate, not capable of heating a high flow shower
  • Can struggle if water temperature is below 67F

EcoSmart ECO Electric Tankless Water Heater

The absolute best selling line of electric tankless water heaters, the EcoSmart ECO is a high quality, no frills unit. Reliable, affordable and capable of delivering a 3.5 GPM flow rate at water temperatures of 67F or higher, which is ideal for the southern United States. EcoSmart have built a version for nearly every electrical configuration, be sure to know what electrical service you have available to ensure you select the right unit. This unit has not only stood the test of time, but has also over 1,600 verified purchase reviews that cheer in one loud voice the quality and reliability of this unit.

The Pros

  • EcoSmart ECO Electric Tankless Water Heater

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    Most popular electric tankless water heater in the southern United States

  • Reliable and will last for the long-term
  • Very affordable relative to the flow rate
  • Nice visual design

The Cons

  • A new name in the water heater business
  • Louder than expected
  • Slow speed to heat at the faucet

If you want a reliable and affordable water heater that can handle a high flow shower head, this may be right water heater for you.