Top 8 Best Tankless Water Heaters

Best Tankless Water Heater Reviews. 

A tankless water heater is an affordable luxury for most homeowners: unlimited hot water, easy install + 8+ year durability

To help you find the right option, here is our list of the best tankless water heaters.

Price ranges from, $299 – $599.

  1. Rinnai Tankless Water Heater
  2. Takagi Indoor Tankless Water Heater
  3. Stiebel Eltron Tankless Hot Water Heater
  4. Rheem Tankless Water Heaters Review
  5. Takagi T-H3-DV-N Tankless Water Heater

 Top #1 Pick: Rinnai Tankless Water Heater Review

Rinnai RUC98iN Ultra Series Natural Gas Tankless Water Heater

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Rinnai Tankless Water Heater is a favorite among homeowners.

Highly efficient, it provides unlimited hot water + temp setting controls (for energy saving)

Heater Type: Natural gas heater

Water Flow: 9.8 GPM (gallons per minute)

Even though it’s more expensive than other models, it’s more durable than similar units — and its dependable in extremely cold weather + high altitudes.

Buyers rave about their excellent customer support during installation.

Very strong online reviews!

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#2.) Takagi Indoor Tankless Water Heater

Takagi T-KJr2-IN-LP Tankless Water Heater

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If you’re in the market for a low-cost, smaller hot water heater this might be your best option.

Half the cost of comparable models the Takagi is highly rated and very durable throughout the years.

Power: 140,000 BTU

Output: 6.6 gallons per min

Heater strength is a little lower at 140,000 BTU and max water temp of 122°F.

Buyers confirm it’s very lightweight (38 pounds) and easy to install.

Additional features:

light-weight design, overheat protection, surge protection

Takagi model (#T-KJr2-IN-NG) is perfect for medium-size homes and families of 2-5 people.

Lots of happy buyer reviews and reasonable price.

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#3.) Stiebel Eltron Tempra Water Review

Stiebel Eltron 224199 Whole House Tankless Electric Water Heater

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If your family runs showers or faucets simultaneously, then the Stiebel Eltron Tempra 36 Tankless Water Heater is an excellent option.

Stiebel Eltron is known to be a very durable water heater w/ copper piping + easy installation.

Temp: 86°F – 140°F

Flow: 5-6 GPM

Copper piping is rare for water heaters and performs well in cold weather.

Also, the adjustable temp feature lets you easily set the degree + amount (which saves on energy).

There’s also a water gauge to let you know the current settings.

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#4.) Rheem Tankless Water Heater Review

Rheem Tankless Water Heater for Home

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With super high ratings from users, the Rheem Tankless Water Heater even exceeds the rigorous industry standards for quality + reliability.

It consistently delivers hot water without fail — If the temperature is set at 125˚F it’s able to stay at a consistent 125˚F.

⭐⭐ Best Tankless Water Heater for Multiple Users ⭐⭐

** This heater is perfect for larger families – it can supply hot water for multiple users simultaneously. You won’t have to worry about taking showers at the same time! 

The Rheem is frequently tested and certified, ensuring you have a large output, durable heater. 


  • Brand: Rheem Manufacturing
  • Output: 9.5 gallons per minute
  • Intelligent digital electronic controls
  • High energy efficiency at 94%
  • Freeze-protected up to -30˚ F
  • 2-pipe direct vent system
  • Simple installation

Potential Flaws

  • Internal fan is a little loud when starting, but becomes quieter

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#5.) Takagi T-H3-DV-N Tankless Water Heater

Takagi Natural Gas Tankless Water Heater

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Yes, you read it right – this unit is actually portable! Do you enjoy camping? Then one might be a great choice – it’s the most portable tankless heater on my list.

Runs on a standard 20 pound liquid propane tank + can be connected to standard hose. For me as well as many others, this is a great feature!

⭐⭐ Best Tankless Water Heater for Easy Install 

** If you move homes/apartments often, it’s very easy to pickup and re-install

If you love to have hot water and want the ability to install anywhere, this is the one for you.


  • Brand: Takagi Water Heaters
  • Output: 10.0 GPM (gallons per min)
  • Temperature range: 50˚F – 140˚F
  • Gas powered heater
  • Energy Star Rated
  • Runs on standard propane tank
  • Great for use in remote locations
  • Rated 2.6 GPM hot water output
  • Safety shut-off feature

Potential Flaws

  • Pipes can break if used in freezing temperatures                            

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#6.) Eccotemp Tankless Water Heater

Eccotemp Portable Tankless Water Heater

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Rheem is one of the most innovative water heaters on the market and is known for their energy efficient and space-saving design.

This Rheem outdoor model is easier and cheaper to install than an indoor tankless heater, because no additional venting is necessary. 

⭐⭐ Best Tankless Water Heater for Large Families ⭐⭐

One of my favorite things about this water heater is the truly endless hot water supply. Many buyers have said in their review that no matter what, they never run out of hot water!

For large families, that’s the most important feature!


  • Brand: Rheem Heaters
  • ** Large family water heater
  • Output: 8.4 gallons per min
  • Natural gas water heater
  • Freeze-resistant
  • Simpler to install than indoor version
  • Endless hot water for families of 4+
  • 10 ft. of thermostat wire included
  • No additional venting necessary

Potential Flaws

  • Control display is a little dim for some users

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#7.) Rheem RTG-95XLN-1 Water Heater

Rheem Natural Gas Tankless Water Heater

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The Rheem Natural Gas Water Heater is one of the best for outdoor installation.

It produces 8.4 GPM and is Energy Star Rated. 

After reading many buyer reviews I noticed that it’s a favorite among home renovators and residential building managers.

According to its description and online reviews, the Rheem Natural Gas Tankless water heater is very easy to install and has great customer service in case you get stuck!


  • Brand: Rheem
  • Output: 8.4 gallons per minute
  • Immediate hot water (even in cold weather!)
  • Easy installation
  • Outdoor installation heater
  • Ideal for simultaneous use
  • Self-install is possible

Potential Flaws

  • Must be installed outdoors

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** I’ll be adding #8 best tankless water heater soon! Stay tuned!


Tankless water heaters are also referred to as on-demand water heaters. They rapidly heat water as you need it without storing it in a traditional storage-tank – it’s essentially an unlimited hot water heater.

Also can be 22% more energy efficient than traditional storage-tank models which hold only 30-50 gallons of water.

Another benefit is durability. Tankless heaters can last 20+ years vs.10-15 you’ll get from a traditional storage heater.

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