8 Best Tankless Water Heaters

black and gray metal pipe

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Heating water for everyday use can be expensive, from getting water in your kitchen faucet, to making coffees in the morning. Traditional tank-style water heaters aren’t only inefficient, but they can be the reason for having water leaks and they take up space as well. Replacing your old water heater with a tankless water heater saves you money and space.

If you’re considering having a tankless water heater installed, check this list of the best tankless water heaters.

1. Best Tankless Water Heater: EcoSmart – ECO 18

Sale
EcoSmart ECO 18 Electric Tankless Water Heater, 18 KW at 240 Volts with Patented Self Modulating...
Ideal for providing hot water for small homes and apartments or larger point-of-use applications.

Top Features:

  • Endless hot water
  • Energy-saver
  • Space-saver

Technical Details:

  • Wattage: 18kW
  • Power source: AC
  • Warranty: Lifetime
  • Weight: 14 pounds
  • Dimensions: 3.63 x 14 x 17 inches

The EcoSmart – ECO 18 has a copper and stainless components that are very durable. It can provide between 1.8 and 4.3 gallons per minute depending on the inlet water temperature. It also features advanced self-modulating technology, only using the amount of energy needed to heat water when you need it.

Most of the reviewers say that they are very happy with this heater. It works really well and it heats up pretty quickly.

A few reviewers complained that it needs a plumber to install. Some say that they have bad customer service.

The heater’s dimensions are ‎‎‎3.63 x 14 x 17 inches. It weighs 14 pounds.

View EcoSmart – ECO 18 on Amazon.

2. Best Home Tankless Water Heater: Stiebel Eltron – Electric Tankless Water Heater

Top Features:

  • Silent operation
  • Space and energy saver
  • Continuous flow

Technical Details:

  • Wattage: 36kW
  • Power source: Battery
  • Warranty: 7 years
  • Weight: 1 pound
  • Dimensions: 4.63 x 16.63 x 14.5 inches

The Stiebel Eltron – Electric Tankless Water Heater is a small, sleek designed, eco-friendly that provides endless hot water for your whole house. One electronic switch will activate the hot water heater and it’s noise-free while in use.

Most of the reviewers say that it is worth every penny. It can produce unlimited hot water and works really well.

A few reviewers complained that it has defects upon arrival. Some say that the buttons are damaged.

The heater’s dimensions are ‎‎‎4.63 x 16.63 x 14.5 inches. It weighs 1 pound.

View Stiebel Eltron – Electric Tankless Water Heater on Amazon.

3. Best Budget Tankless Water Heater: ECOTOUCH – Electric Tankless Water Heater

Tankless Water Heater Electric 5.5kw 240V, ECOTOUCH Point-of-Use Hot Water Heater Digital...
Provides instant and endless hot water with a minimum energy cost.

Top Features:

  • More hygiene
  • Smart modulation
  • Sleek and compact

Technical Details:

  • Wattage: 5.5kW
  • Power source: AC
  • Warranty: N/A
  • Weight: 6.87 pounds
  • Dimensions: 15 x 11.02 x 4.84 inches

The ECOTOUCH – Electric Tankless Water Heater comes with a digital display and a touch control panel. The water heater supplies instant, consistent, endless, and adjusts power input based on flow rate and temp setting in real-time.

Most of the reviewers say that it is the quality of the heater is great. It works well, is fast, and has unlimited hot water.

A few reviewers complained that it has some problems with the plumbing design. Some say that it doesn’t last long.

The heater’s dimensions are ‎‎15 x 11.02 x 4.84 inches. It weighs 6.87 pounds.

View ECOTOUCH – Electric Tankless Water Heater on Amazon.

4. Best Natural Gas Tankless Water Heater: Rinnai – Tankless Hot Water Heater

Rinnai V75iN Natural Gas Tankless Hot Water Heater, 7.5 GPM
Offers the most advanced technology with comfort and value.

Top Features:

  • Optimal water pressure
  • Enhance scale detection
  • Space-efficient

Technical Details:

  • Wattage: N/A
  • Power source: Gas
  • Warranty: 1 year
  • Weight: 45.6 pounds
  • Dimensions: 14.04 x 9.27 x 26.9 inches

The Rinnai – Electric Tankless Water Heater has a high-performance up to 7.5 GPM hot water flow rate for a powerful, constant stream. It conserves energy as it heats only when necessary.

Most of the reviewers say that it is a dependable tankless unit. Best built and reliable over time.

A few reviewers complained that it is difficult to install. Some say that it never gives the accurate hotness of the water.

The heater’s dimensions are ‎‎14.04 x 9.27 x 26.9 inches. It weighs 45.6 pounds.

View Rinnai – Electric Tankless Water Heater on Amazon.

5. Best Compact Tankless Water Heater: Rheem – Electric Tankless Water Heater

Rheem RTEX-18 18kW 240V Electric Tankless Water Heater, small, Gray
Hot showers will never be interrupted again with this water heater.

Top Features:

  • Digital thermostatic control
  • Advance self-modulation
  • Durable immersion

Technical Details:

  • Wattage: 18kW
  • Power source: Battery
  • Warranty: 1 year
  • Weight: 14.8 pounds
  • Dimensions: 18.25 x 3.5 x 14.5 inches

The Rheem – Electric Tankless Water Heater has robust copper immersion heating elements with a brass top that increases durability and is threaded for easy replacement. It has continuous hot water that is on-demand for single point-of-use or multiple applications.

Most of the reviewers say that it is the digital dial control is nice. It works fine and gives what you need.

A few reviewers complained that there are internal defects. Some say it can’t handle the flow.

The heater’s dimensions are ‎‎18.25 x 3.5 x 14.5 inches. It weighs 14.8 pounds.

View Rheem – Electric Tankless Water Heater on Amazon.

6. Best Electric Tankless Water Heater: Camplux – Electric Tankless Water Heater

Top Features:

  • Digital temperature control
  • High thermal efficiency
  • Forced exhaust fan

Technical Details:

  • Wattage: N/A
  • Power source: Wind, fuel
  • Warranty: 1 year
  • Weight: 23.8 pounds
  • Dimensions: 12.8 x 5.91 x 20.28 inches

The Camplux – Electric Tankless Water Heater is designed for small to medium hot water production. It has innovative combustion technology and advanced multiple protection systems to ensure your safety.

Most of the reviewers say that it works great when you understand the controls. The water never gets cold and gives endless hot water.

A few reviewers complained that it uses a non-standard vent pipe. Some say it has some faulty wires.

The heater’s dimensions are ‎‎12.8 x 5.91 x 20.28 inches. It weighs 23.8 pounds.

View Camplux – Electric Tankless Water Heater on Amazon.

7. Best Budget Tankless Water Heater: EcoSmart – ECO 11

Sale
EcoSmart ECO 11 Electric Tankless Water Heater, 13KW at 240 Volts with Patented Self Modulating...
Saving space, time, money, and allowing you to reduce your overall energy and water use.

Top Features:

  • Endless stream
  • Saves space
  • Saves energy

Technical Details:

  • Wattage: 13kW
  • Power source: AC
  • Warranty: Lifetime
  • Weight: 6.5 pounds
  • Dimensions: 3.75 x 8 x 11.5 inches

The EcoSmart – ECO 11 has a 13-kilowatt tankless electric water heater ideal for providing up to 3.1 gallons per minute of hot water. This heater is 99% thermal energy efficient. It gives consistent hot water when you need it that never runs out.

Most of the reviewers say that it is a great little water heater. The installation is easy, saves energy, and works fantastic.

A few reviewers complained that the warranty is useless. Some say that they have poor customer support.

The heater’s dimensions are ‎‎‎3.75 x 8 x 11.5 inches. It weighs 6.5 pounds.

View EcoSmart – ECO 11 on Amazon.

8. Best Energy-Saving Tankless Water Heater: Eemax – Tankless Water Heater

Eemax EEM24018 Electric Tankless Water Heater, Blue
Enjoy the comfort and convenience of continuous hot water at a lower price.

Top Features:

  • Self-modulating technology
  • Digital temperature control
  • Compact size

Technical Details:

  • Wattage: 15kW
  • Power source: Battery
  • Warranty: 5 years
  • Weight: 14.27 pounds
  • Dimensions: 17 x 14 x 3.75 inches

The Eemax – Tankless Water Heater provides a continuous supply of hot water and only heats the water you need. This product can be used for any of your residential or commercial water heating needs. It can produce enough hot water for up to 1 shower and 2 sinks simultaneously in colder climates.

Most of the reviewers say that it is a nice water heater. It is compact and very efficient.

A few reviewers complained that it does not function as instructed. Some say it does not get the water hot enough.

The heater’s dimensions are ‎‎17 x 14 x 3.75 inches. It weighs 14.27 pounds.

View Eemax – Electric Tankless Water Heater on Amazon.

Best Tankless Water Heaters Comparison Table

Product nameWattagePower sourceWarrantyWeightDimensions
EcoSmart – ECO 1818kWACLifetime14 pounds3.63 x 14 x 17 inches
Stiebel Eltron – Electric Tankless Water Heater36kWBattery7 years1 pound4.63 x 16.63 x 14.5 inches
ECOTOUCH – Electric Tankless Water Heater5.5kWACN/A6.87 pounds15 x 11.02 x 4.84 inches
Rinnai – Tankless Hot Water HeaterN/AGas1 year45.6 pounds14.04 x 9.27 x 26.9 inches
Rheem – Electric Tankless Water Heater18kWBattery1 year14.8 pounds18.25 x 3.5 x 14.5 inches
Camplux – Electric Tankless Water HeaterN/AWind, fuel1 year23.8 pounds12.8 x 5.91 x 20.28 inches
EcoSmart – ECO 1113kWACLifetime6.5 pounds3.75 x 8 x 11.5 inches
Eemax – Tankless Water Heater15kWBattery5 years14.27 pounds17 x 14 x 3.75 inches

Best Tankless Water Heaters FAQs

Is it worth convert to a tankless water heater?

Using a tankless water heater can reduce these costs by up to 50 percent. They are durable and less likely to fail, causing potentially catastrophic flooding in your home.

Do tankless water heaters take longer to heat up?

If you have a tankless water heater then you probably already know that it takes longer to get hot water with a tankless water heater than with an old-fashioned storage tank-type water heater. Typically tankless water heaters take 10 to 20 seconds longer to get hot water to the fixtures.

What is the lifespan of a tankless water heater?

Most tankless water heaters have a life expectancy of more than 20 years. They also have easily replaceable parts that extend their life by many more years. In contrast, storage water heaters last 10-15 years.

Last update on 2020-09-29 / Affiliate links / Images from Amazon Product Advertising API