Top 8 Best Tankless Water Heaters Review

Tankless Water Heater Image Concept in Basement

Best Tankless Water Heater Review.

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

Hot water heaters:

#1.) Rinnai Tankless Water Heater Review
#2.) Takagi Indoor Water Heater
#3.) Stiebel Eltron Tempra Review
#4.) Rheem Tankless Water Heater Review
#5.) Takagi Natural Gas Tankless Heater
#6.) Eccotemp Portable Tankless Water Heater
#7.) Rheem Natural Gas Tankless Heater
#8.) Coming soon!

** FYI: links go to Amazon (which had best pricing)

 Top #1 Pick: Rinnai Tankless Water Heater Review

Rinnai Tankless Water Heater Image

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Rinnai Tankless Water Heater is a favorite among homeowners – Very strong online reviews!

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

⭐⭐ Best Tankless Water Heater for Winter ⭐⭐

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.


  • Brand: Rinnai Tankless Water Heater
  • Output: 9.8 GPM (gallons per minute)
  • Type: Natural gas heater
  • Very easy installation (DIY unit)
  • Space-saving design
  • Concentric/Twin Pipe Installation
  • Energy Factor – up to 0.96 
  • Ultra low NOx emissions

Potential Flaws

  • Very expensive

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#2.) Takagi Indoor Tankless Water Heater

Takagi Tankless Water Heater Image

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

⭐⭐ Best Tankless Water Heater for Medium Homes ⭐⭐

Amazingly priced at half the cost of comparable models the Takagi is highly rated and very durable throughout the years.

Heater strength is a little lower at 140,000 BTU but it’s lightweight (38 pounds) + easy to install.

Takagi model (#T-KJr2-IN-NG) is perfect for medium homes or apartments.


  • Brand: Takagi Water Heaters
  • Power: 140,000 BTU
  • Output: 6.6 gallons per min
  • Wall-mounted control panel
  • Constant temperature monitoring
  • Perfect for small apartment use
  • Very affordable + easy install

Potential Flaws

  • Not the best choice for homes with 5+ people

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#3.) Stiebel Eltron Tempra Water Review

Stiebel Eltron Electric Tankless Water Heater Image

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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.

FYI: 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.


  • Brand: Stiebel Tankless Water Heaters
  • Water temp range: 86°F – 140°F
  • Simple plumbing system = easy to installation!
  • No venting required
  • Runs multiple water outlets with ease
  • High-quality copper pipe
  • Sensor works w/ low-flow showers
  • Simple installation

Potential Flaws

  • Warranty covers parts only

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#4.) Rheem Tankless Water Heater Review

Takagi Gas Tankless Water Heater Image

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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 Natural Gas Tankless Water Heater

Takagi Gas Tankless Water Heater Image

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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 Portable Tankless Water Heater

Eccotemp Portable Tankless Water Heater Image

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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. So the cost and the complexity of installation are substantially minimized.

⭐⭐ 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 Natural Gas Tankless Water Heater

Rheem Best Tankless Water Heater Image

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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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