Best Under Sink Tankless Water Heater Reviews (2019)

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Under the sink tankless water heater, also known as the point of use water heater is designed to be installed under the sink. It can be in the bathroom or the kitchen and comes with a small flow rate which can handle only a single point.

Also known as under counter water heater, they are designed to handle washing machine, kitchen faucet, etc. They are easy to install without the need of venting equipment.

Deciding on the best mini tankless heater on your own could be a lot of work. This is not surprising as there are many tankless water heaters out there with various specifications which could end up getting you confused. As a result of this, we have done the hard work for you.

After hours of digging through customer reviews and opinions of real users, we have come up with the best under sink water heaters on the market. Our selections are based majorly on real user review and opinions.

With that in mind, rest assured the options below will ensure that you get an under sink tankless heater that has served other customers effectively.

Here is our top 10 findings.

Comparison Table for Best tankless Water Heater Under Sink

Name Rating Prices Fuel Type Application type Location
EcoSmart ECO 11 4 out of 5 stars (4 / 5)

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CHECK PRICE ON AMAZON Electric  Point of use Indoors
ECOTOUCH Electric -Point-of-Use 4.5 out of 5 stars (4.5 / 5)

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CHECK PRICE ON AMAZON Electric Point of use Indoors
Lyty Instant – Under Sink 220V 5.5KW 4 Power  4.2 out of 5 stars (4.2 / 5)

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CHECK PRICE ON AMAZON Electric Point of use Indoors
Takagi T-KJr2-IN-NG  4.3 out of 5 stars (4.3 / 5)

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CHECK PRICE ON AMAZON Natural gas Point of use Indoors
Eemax EEM24018 4.1 out of 5 stars (4.1 / 5)

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CHECK PRICE ON AMAZON Electric Point of use Indoors
Camplux 10L 2.64 GPM  4 out of 5 stars (4 / 5)

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CHECK PRICE ON AMAZON Propane Whole house/on demand Indoors
iHeat Tankless S-14 240V 59A 14KW  4 out of 5 stars (4 / 5)

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CHECK PRICE ON AMAZON Electric Point of use Indoors
Eccotemp i12-NG Tankless Water Heater  4.2 out of 5 stars (4.2 / 5)

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CHECK PRICE ON AMAZON Natural Whole house Indoors
Ecosmart POU 6 Point of Use  5 out of 5 stars (5 / 5)

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CHECK PRICE ON AMAZON Electric Point of use Indoors
Bosch Electric Tankless Water Heater  3.2 out of 5 stars (3.2 / 5)

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CHECK PRICE ON AMAZON Electric Point of use Indoors

Best Under Sink Tankless Water Heater Reviews

1

EcoSmart ECO 11 Electric Tankless Water Heater, 13KW at 240 Volts with Patented Self Modulating Technology

  • Fuel Type: Electric
  • Application Type: Point of use
  • Location: indoor
  • GPM: 2 GPM
  • Energy Efficiency: 99.8%
  • Size: 8 x 8 x 11.5 inches
  • Weight: 6.5 pounds
  • Display: digital
  • Warranty: Lifetime

First in our mini under sink tankless water heater review is Ecosmart Eco 11. Over the years, Ecosmart tankless heaters have been the top choice for many users. This is due to the fantastic features that the technology is packed with. There is the patented self-modulating technology which reduces demands on power to give optimal heating. Being a point of use model, it can effectively deliver 2 gallons of water per minute.

In climates where the incoming water temperature is 67F and above, it can be used as a whole house model. In colder climates, however, it is best suited as a point of use model. This tankless water heater will sure give you an endless supply of hot water for your sink and shower. It is guaranteed to save as much as 50% on water heating cost.

It is a small model hence, can comfortably fit under the sink. We love the impressive energy efficiency meaning you will get the most out of this water heater.

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PROS:
  • High energy efficiency
  • Limited lifetime warranty
  • Easily accessible spare parts

CONS:
  • The need to spend more on installation cost

User Rating:

4 out of 5 stars (4 / 5)

2

ECOTOUCH Electric Tankless Water Heater Point-of-Use Hot Water Heater Digital Display for Energy Efficiency 5.5kW at 240V, White

  • Fuel Type: Electric
  • Application Type: Point of use
  • Location: Indoor
  • GPM: 1.2 GPM
  • Energy Efficiency: 98%
  • Size: 5 x 9.8 x 4.1 inches
  • Weight: 5.97 pounds
  • Display: Digital
  • Warranty: Lifetime

ECOTOUCH stands out as one of the limited choices in the mini tankless water heater market with smart modulation technology. This and many more are the features that make this ECOTOUCH electric tankless heater part of our top ten. With an impressive energy efficiency of 98%, you can get a temperature rise of between 67F to 109F.

It comes in a compact size, making it perfect for under the bathroom or kitchen sink. Not only that, it is appropriate for the doctor’s office, mall, and public toilet etc. With a 5.5KW heating system, this mini under sink water heater supplies a constant flow of hot water without restriction. Users will not experience a cold water sandwich or be delayed in waiting for hot water.

It is completely safe and durable, with many protection devices. Besides, the unit was tested and manufactured under strict code to ensure that safety is not compromised. Water and electricity line run separately; hence, no harm in any way. The device is pretty easy to use, the touch control panel and digital display make your job easy.

PROS:
  • Impressive safety device
  • Capable of being installed in the kitchen or bathroom
  • High energy efficiency
  • Capable of 65% energy saving

CONS:
  • Some users complained of difficulty in getting very hot water

User Rating:

4.5 out of 5 stars (4.5 / 5)

3

Instant Tankless Water Heater Electric – Under Sink 240V 5.5KW 4 Power Levels Mini Hot Water Heater for Kitchen Bathroom

  • Fuel Type: electric
  • Application Type: Point of use
  • Location: Indoor
  • GPM: 0.3 GPM
  • Size: 9 x 3 x 3 inch
  • Weight: 3.84 pounds
  • Display: Digital
  • Warranty: 5

This is a classy and fashionable under sink tankless water heater. It comes with abundant features that make it widely accepted as a reliable mini tankless water heater. It is an electric unit that serves a single point; hence, fit for installation under the sink in your bathroom or kitchen.

You get to set your desired temperature with the touch control setting that gives temperature in an increment of 1 degree. While it comes with an installation manual, it is best installed by a pro. This tankless heater is safe, does not give out radiation nor pollution. Besides, it gives considerable saving on electricity and water cost. It comes with all necessary accessories to ensure you have a swift installation

This is a reliable mini tankless water heater to take care of your hot water need. It works on a 240V voltage supply and comes with impressive safety features that make it safe for use in the house.

PROS:
  • No radiation or pollution of any sort
  • Sleek and compact design
  • LCD

CONS:
  • Can only serve a single point at a time

User Rating: 

4.2 out of 5 stars (4.2 / 5)

4

Takagi T-KJr2-IN-NG Indoor Tankless Water Heater, Natural Gas

  • Fuel Type: Natural gas
  • Application Type: Point of use
  • Location: Indoor
  • GPM: 6.6 GPM
  • Energy Efficiency: 95%
  • Size: 7 x 13.8 x 20.3 inches
  • Weight: 37 pounds
  • Display: digital
  • Warranty: 10 years

If you need a reliable under sink Natural gas tankless water heater, Takagi T-KJr2-IN-NG is a good choice. It is strong and effortless to maintain. It is a small and light unit, fit for providing a steady supply of hot water for your sink. With the right set of tools, you can install this in a couple of hours. The disadvantage, of course, is the risk of voiding your warranty

It comes with a couple of necessary accessories that ensure a seamless installation process. With an impressive flow rate of 6.6 gallons per minute, it can handle more than your sink. The thermistor ensures water flow at a constant temperature without fluctuation.

This is a recommended choice if you stay in a small apartment. You can use it without the fear of release of any toxic gas, making it is safe. A power of 140,000 BTU per hour makes it strong enough to handle all you throw at it.

PROS:
  • Outlet water at a constant temperature
  • A straightforward installation process

CONS:
  • Possibility of cold water sandwich

User Rating: 

4.3 out of 5 stars (4.3 / 5)

5

Eemax EEM24018 Electric Tankless Water Heater Blue

  • Fuel Type: Electric
  • Application Type: point
  • Location: Indoor
  • GPM: 3.5 GPM
  • Energy Efficiency: 99.8%
  • Size: 17 x 14 x 3.8 inches
  • Weight: 14.5 pounds
  • Display: Digital
  • Warranty: 5 years leak, 1 year part

Eemax electric tankless water heater is your ticket to constant supply of hot water on demand. It is recommended for residential and commercial use. Hence, it can be used at the hotel, restaurants, under the sink in your kitchen and bathroom. It operates a 240 volt, 18 kilowatts unit strong enough to power two sinks and a shower at the same time.

For people in warm climates, it can power as much as 4 sinks at the same time. You get hot water supply at a constant temperature without excess demand on power. This is due to the self-modulating technology that allows the device to adjust its energy demands based on the amount of hot water needed.

It is compact, small enough to be installed under the sink.

PROS:
  • Impressive savings on energy bills
  • Very easy to install
  • Compact and light

CONS:
  • Need for separate breakers

User Rating: 

4.1 out of 5 stars (4.1 / 5)

6

Camplux 10L 2.64 GPM High Capacity Color Screen Propane Tankless Water Heater

  • Fuel Type: propane
  • Application Type: Whole house/on demand
  • Location: Indoor
  • GPM: 2.64GPM
  • Energy Efficiency: 88.5%
  • Size: 8 x 5.9 x 20.3 inches
  • Weight: 23.8 pounds
  • Display: Digital
  • Warranty: 1 year

Also in the series of our instant hot water heater under the sink, we have Camplux CM264. It is the ideal for small and medium hot water need, hence, essential for use under the sink in your home, cabins, apartments and small homes. It works with a 110 Volt power cord that drives the internal exhaust valve. It operates a safe ignition system, which makes it safe and ideal for indoor use.

This under sink propane tankless water heater can give a 77F temperature rise. It employs advanced combustion technology in raising water temperature. Besides, there are multiple safety devices present in the heater. This device is portable, energy efficient and guaranteed to last long. The advanced water heater technology can get you 50% saving on heating cost.

It comes with all necessary installation accessories needed for easy installation. It can be used as a whole house unit or on demand. The ventilation system is robust and efficient; hence, no toxic gas released inside.

PROS:
  • Impressive safety device
  • Energy saving option
  • High efficiency

CONS:
  • Not recommended for use at high altitude

User Rating: 

4 out of 5 stars (4 / 5)

7

iHeat Tankless S-14 240V 59A 14KW Stainless Steel Enclosure 7.2″ by 11″ by 3″ 1/2″CPT 36′ AWG#6 Electric Water Heater, 7.5 lb

  • Fuel Type: Electric
  • Application Type: Point of use
  • Location: Indoor
  • GPM: 3
  • Energy Efficiency:
  • Size: 5 x 7.7 x 11.5 inches
  • Weight: 8 pounds
  • Display: digital
  • Warranty: 1 yr Elements limited 3-Year Components 5-yr leaks

With the capacity to heat 3.0 gallons of water per minute, this electric under sink tankless water heater is a powerful model.  Powerful enough to serve two sinks at 1.5 gpm each. It is best suited for warm climates like Florida, Georgia, Texas and Alabama. In colder climates, however, it is suitable for point of use application since it heats less volume of water per minute.

This small under sink tankless heater features high-quality material which ensures durability. It is made of stainless steel alongside an ixp-4 waterproof construction. It produces very clean water, hence recommended for application where clean water is not negotiable. Therefore, hospitals, clinics, laboratories, etc. will find iHeat Tankless S-14 water heater helpful.

It is small and compact, perfect for closet or under counter installation. With this, you get as much as 60% saving on your water bills. It also features a waterproof construction that helps you control your temperature safely. This is possible due to the waterproof interactive pad.

PROS:
  • Clean water guaranteed
  • Simple and straightforward installation
  • Makes clean water available
  • Impressive saving on heating cost

CONS:
  • Some parts were a little challenging to install

User Rating: 

4 out of 5 stars (4 / 5)

8

Eccotemp i12-NG Tankless Water Heater

  • Fuel Type: Natural Gas
  • Application Type: Whole house
  • Location: Indoor
  • GPM: 3 GPM
  • Energy Efficiency: 85%
  • Size: 16 by 16 by 11 inches
  • Weight: 29 pounds
  • Display: LCD
  • Warranty: 2 years

Also in the list of under sink tankless water heater is Eccotemp I12 – NG. It comes with a unique design which stands it out of the many tankless water heaters available. It comes in a beautiful sleek gorilla glass casing with fully automatic temperature giving you total control of the temperature setting. You get to monitor the output temperature and flow rate via the LCD

With an impressive flow rate of 3 gallons of water per minute, it can handle small and medium hot water needs, perfect for sinks. It comes with a list of essential accessories like the horizontal stainless steel, vent kit, 120 volts UL listed power cord, etc.

Powered by natural gas, it can serve one or two points at a time. It does not need pilot arc, and the energy consumption is regulated based on hot water needs. The electronic ignition system is entirely safe, plus other impressive safety features.

PROS:
  • Comes with needed accessories
  • Regulated energy consumption
  • Abundant safety features

CONS:
  • Not recommended for use in heights above 5500 Feet

User Rating: 

4.2 out of 5 stars (4.2 / 5)

9

Ecosmart POU 6 Point of Use Electric Tankless Water Heater, 6 KW by EcoSmart

  • Fuel Type: Electric
  • Application Type: Point of use
  • Location: Indoor
  • GPM: 0.5 gpm
  • Energy Efficiency: 99.8%
  • Weight: 5.35 pounds
  • Display: Digital
  • Warranty: 1 year

If you need an under sink tankless water heater small and efficient, Ecosmart POU 6 is the right choice. It is small, compact with high efficiency and powered by electricity. It is one of the best selling brands online. As a result of the compact design, it fits perfectly for under sink, bathroom, offices, and garages.

Installation is easy and can be done almost anywhere. Bear in mind, however, that it works best for a single point, like the sink. It is not ideal for showers as the flow rate is 0.5 gallons per minute. On activation, the water flow activates the sensor which gears up the heat exchanger. It, however, comes with self-modulation technology that matches water consumption based on the hot water needs.

You can get temperature increments in 1F with the temperature controller. There is the digital display which helps monitor flow rate and output temperature. There is no danger of corrosion as the parts are made of copper which ensures durability

PROS:
  • Small and compact
  • Durable, possibility of lasting two decades
  • Impressive saving on energy bills
  • Under sink tankless water heater parts readily available

CONS:
  • User will have to purchase some installation accessories

User Rating: 

5 out of 5 stars (5 / 5)

10

Bosch Electric Tankless Water Heater – Eliminate Time for Hot Water – Easy Installation

  • Fuel Type: electric
  • Application Type: Point of use
  • Location: Indoor
  • GPM: 1.8 gpm
  • Energy Efficiency: 98%
  • Size: 2 x 3 x 6.5 inches
  • Weight: 4.9 pounds
  • Display: Digital
  • Warranty: 5 years

Bosch Tronic 3000 under sink tankless water heater comes in a small and compact size that makes them ideal for use in the cabinet. It can be mounted under the sink to give a continuous supply of hot water for use in your bath and kitchen. It does not use any temperature or pressure relief and comes with an efficiency of 98%.

It is durable and guaranteed to last many years to come. They come in attractive design and blend very well with existing house designs. It is fit for a utility room, garage, attic, and patio kitchen. Being a point of use water heater, it eliminates the need to wait for the water to heat up and travel through the pipe.

If you are tight on space, this is a tankless water heater worth considering. It can be mounted vertically or horizontally.

PROS:
  • Straightforward installation process
  • Very efficient unit
  • Instant hot water available on demand
  • Light in weight

CONS:
  • Lacks a thermostat

User Rating: 

3.2 out of 5 stars (3.2 / 5)

Advantages of Under Sink tankless Water Heater

  1. They are usually small and compact, designed to be installed in any convenient spot, but mostly under the sink
  2. Most under the sink tankless water heater are the electric type. Hence, the installation process is pretty straight forward.
  3. Hot water is made available almost instantly as the tankless heater is located where it is needed. Water does not have to travel through pipes where it can be subjected to heat loss.
  4. Hot water supply is constant since the heater is serving a single point.

How to Select the best under Sink tankless Water Heater

 

Mini water heater under sink comes in different rating. Before making your selection, it is essential to get the flow rate and temperature rise desired at the point of use. The following points summarize how to chose an under sink tankless water heater.

  1. An idea of how frequently you will be using the sink is very essential. This will allow you to get the flow rate that will be used in sizing your water heater under sink.
  2. Decide the temperature rise you need at the point of use, and this will help narrow down your search to the under sink tankless water heater brand that can give the required rise.
  3. Select a location, which obviously will be under your sink. But it could be your kitchen or bathroom.
  4. Since this is dedicated for a single point, the most common are point of use under sink electric water heater. Hence, you need to be sure that your house’s power rating can serve your under sink heater.
  5. All in all, we recommend going for the one that offers the best value for the money.

 

Conclusion

You can get a tankless water heater to take care of dedicated spots like sink, showers etc. These under sink tankless water heaters have all you need to get you started.

Make sure to follow our review as this is the opinion of our tech experts with years of reviewing home gadgets. Our under sink tankless water heater review, without a doubt, will guide you to make the best choice.

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