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5 Best Under Sink Water Heaters

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I’m pretty sure you’re here to upgrade your water heater. But before that, have you ever thought of getting an under sink water heater? These devices are quite compact and they provide you hot water on the spot.

Efficiency and effectiveness are two of the most important things that you should look for when getting a water heater. So to make sure that you won’t get a faulty one. We compiled the best under sink water heaters that are available on the market.


1. Agust Under Sink Water Heater

Top Features:

  • Fast recovery rate
  • Energy-saving
  • Compact design

Technical Details:

  • Voltage: 110-120 volts
  • Max temperature: 167℉
  • Max pressure: 115 PSI
  • Weight: 11.48 pounds
  • Dimensions: 168 x 126 x 122.4 inches

The Agust Under Sink Water Heater is a durable water heater that is made of high-quality materials to ensure that the quality and protection functions work perfectly.

Reviewers really love this water heater. It works perfectly, the price is great, it heats up fast, and the overall functionality is fantastic.

A few reviewers complained that the instruction manual is a bit confusing. There are also a few reviewers who complained that the quality feels cheap.

The water heater’s dimensions are 168 x 126 x 122.4 inches. It weighs 11.48 pounds.

If you’re looking for a durable water heater, then this is for you!

View Agust Under Sink Water Heater on Amazon

2. thermomate Under Sink Water Heater

Sale
thermomate Mini Tank Electric Water Heater ES250 2.5 Gallons Point of Use No Wait for Hot Water...
This water heater has a compact design that is convenient for tiny homes and apartments.

Top Features:

  • Adjustable temperature
  • Easy to install
  • High thermal efficiency

Technical Details:

  • Voltage: 120 volts
  • Max temperature: 149°F
  • Max pressure: 150 PSI
  • Weight: 18.44 pounds
  • Dimensions: 16.14 x 15.04 x 14.17 inches

The thermomate Under Sink Water Heater is a premium quality water heater that has an enamel coating to maximize its insulation and prevent leakage.

A lot of reviewers really love this water heater. It’s very easy to install, the size is nice and compact, the settings are easy to adjust, and overall it works nicely.

The water heater’s dimensions are 16.14 x 15.04 x 14.17 inches. It weighs 18.44 pounds.

If you’re looking for an adjustable water heater, then this is a great option for you!

View thermomate Under Sink Water Heater on Amazon

3. Thermoflow UT10 Water Heater

Sale
Thermoflow UT10 2.5 Gallons 110~120V Corded Electric Mini Tank Water Heater for Under Sinks 110V ~...
If you want a water heater that is safe to use, then get this water heater.

Top Features:

  • Maintenance free
  • Overheat protection
  • Corrosion resistance

Technical Details:

  • Voltage: 110-120 volts
  • Max temperature: 167°F
  • Max pressure: 150 PSI
  • Weight: 14.72 pounds
  • Dimensions: 18 x 11 x 12.2 inches

The Thermoflow UT10 Water Heater is an energy-saving water heater that is specially designed to be perfectly safe for use. It utilizes safety features to prevent overheating.

Reviewers really love this water heater. It heats up very quick, it’s very easy to install, the size is pretty good, and the safety features are nice and reassuring.

A few reviewers complained that the water heater’s relief valve is faulty. It has an unreliable design that caused it to leak so much.

The water heater’s dimensions are 18 x 11 x 12.2 inches. It weighs 14.72 pounds.

If you’re looking for safe water heater, then this is a great option for you!

View Thermoflow UT10 Water Heater on Amazon

4. BISELONG Under Sink Water Heater

Sale
Tankless Electric Hot Water Heater 220/240V under sink Kitchen Household, Small Compact Instant No...
Consistency is the name of the game here and this water heater is very consistent.

Top Features:

  • Easy to use
  • Waterproof gasket
  • Consistent hot water

Technical Details:

  • Voltage: 220-240 volts
  • Max temperature: 121℉
  • Max pressure: 110 PSI
  • Weight: 14.77 pounds
  • Dimensions: 17.9 x 11 x 2.3 inches

The BISELONG Under Sink Water Heater is a tankless water heater that has wide applications. You can choose from two different colors.

Reviewers really love this water heater. It works perfectly just as described, it produces hot water instantaneously, and overall this water heater is definitely worth the bucks.

The water heater’s dimensions are 13.78 x 9.92 x 6.06 inches. It weighs 7.43 pounds.

If you’re looking for a tankless, under sink water heater, then this is a great option for you!

View BISELONG Under Sink Water Heater on Amazon

5. FRANKE HT-300 Under Sink Water Heater

FRANKE HT-300 Little Butler Under Sink Instant Hot Water Filtration Heating Tank, 300-Watt (Latest...
Reduce the waiting time on getting hot water by investing on this water heater.

Top Features:

  • Great filtration system
  • Convenient adjustment dial
  • Stainless steel tank

Technical Details:

  • Voltage: 120 volts
  • Max temperature: 194℉
  • Max pressure: 75 PSI
  • Weight: 9.2 pounds
  • Dimensions: 9.4 x 7.8 x 11.6 inches

The FRANKE HT-300 Under Sink Water Heater is a filtrating, under sink water heater that heats up water close to its boiling point. It has a convenient dial that helps you adjust the water heater conveniently.

A lot of reviewers really love this water heater. It works as advertised, it’s very easy to install, it’s very reliable, and overall the water heater works nicely.

A few reviewers complained that the water heater leaks a lot. There are also a few reviewers who complained that the customer service could be better.

The water heater’s dimensions are 9.4 x 7.8 x 11.6 inches. It weighs 9.2 pounds.

If you’re looking for a filtrating water heater, then this is a great option for you!

View FRANKE HT-300 Under Sink Water Heater on Amazon

Under Sink Water Heaters Comparison Table

Product nameVoltageMax temperatureMax pressureWeightDimensions
Agust Under Sink Water Heater110-120 volts167℉115 PSI11.48 pounds168 x 126 x 122.4 inches
thermomate Under Sink Water Heater120 volts149°F150 PSI18.44 pounds16.14 x 15.04 x 14.17 inches
Thermoflow UT10 Water Heater110-120 volts167°F150 PSI14.72 pounds18 x 11 x 12.2 inches
BISELONG Under Sink Water Heater220-240 volts121℉110 PSI14.77 pounds17.9 x 11 x 2.3 inches
FRANKE HT-300 Under Sink Water Heater120 volts194℉75 PSI9.2 pounds9.4 x 7.8 x 11.6 inches

Under Sink Water Heaters FAQs

When should I replace my water heater?

If you notice rust accumulating on the pipes and there are leakage caused by those rusted pipes. There are also cases where the water coming from the faucet is a bit murky, when that happens you should replace the water heater.

Are under sink water heaters safe to use?

Yes, they are generally safe for use. As long as you follow the instructions correctly and you don’t make a mistake in installing the water heater.

Can I check the water heater without buying it first?

You can’t check it physically, but you can go to the reviews section on Amazon. There are a lot of helpful reviews that may help you choose the best one for you.

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