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Best under sink instant hot water heaters for a hot water supply in 2022.

Get one before your wife does.

Positive feelings from past customers

  • Heats water quickly

  • Easy to install

  • Compact size

  • Durable

Negative feelings from past customers

  • Did not work at all

  • Wiring was never connected in the block

  • Heater does not make any HOT water

  • Will need to hire a certified technician

  • The unit is dead

The Bosch Thermotechnology 7736505868, 4.5kW, Bosch US4-2R Tronic 3000 Electric Tankless is a new under-sink tankless water heater designed to provide an endless supply of instantaneous hot water to one or more sinks. With a new lower activation flow rate of only 0.4 GPM, it can be used with newer, low flow faucets. The unit is ultra compact and lightweight, measuring 6.6" x 12.8" x 2.9", making it the perfect size for light commercial applications such as shopping malls, airports, stadiums and offices. It is also 98% efficient and does not require a temperature or pressure relief valve.


The user review sentiment for this product is generally positive, with 45% of reviewers giving it a five star rating. However, 21% of reviewers give it a one star rating, indicating that there is some room for improvement.


According to user reviews, the Bosch US4-2R Tronic 3000 Electric Tankless Water Heater is a reliable and efficient water heater that provides an endless supply of hot water. It is easy to install and can be used in both residential and commercial applications. This water heater is ideal for those who want to save space and money on their energy bill.

$214.37 AT AMAZON

Positive feelings from past customers

  • Heats water quickly

  • Easy to install

  • Good customer service

  • No wasted water

Negative feelings from past customers

  • Water pressure is lessened

  • Water temperature not as hot as hoped

  • Pressure drop compared to cold water side

  • Product came broken

The 2400W Electric Tankless Water Heater is a point-of-use water heater that is ideal for undersink applications. With a min. flow activation of 0.40 gpm, it has a temp. range of 90 degrees to 120 degrees Fahrenheit. This unit also features a water connection of 3/8 inches compression and a temp. rise @ 0.5 GPM of 33 degrees Fahrenheit.


The 2400W Electric Tankless Water Heater is a tools and home improvement product designed for rough plumbing. The product is 99% energy efficient, compact in size, and easy to install with a low installation cost. The water heater has a temperature range of 90 degrees to 120 degrees Fahrenheit, a water connection of 3/8" compression, and a pressure range of 25 to 150 psi. The product is UL, IAMPO, HUD, and ADA compliant and has a horizontal mounting. The water heater is made in the United States.


The vast majority of users who have reviewed this product give it high marks, with 8 out of 21 giving it a full 5-star rating. Only 4 reviewers give it just 1 star, for a 21% one-star rating. This leaves a very positive 80% of reviewers giving the product 4 stars or higher.


According to user reviews, the 2400W Electric Tankless Water Heater is a great product that is easy to install and use. It heats water quickly and efficiently, and is very durable. Users also appreciate the fact that it is compact and takes up very little space. Overall, this is an excellent product that is well worth the investment.

$181.68 AT AMAZON

, Dimensions - Water Heaters 10-1/2 in H x 8 in W x 3-3/4 in D, Tankless Yes, Mounting Type Wall, Standards - Water Heaters ASME, CSA, DOE, Certifications - Water Heaters ANSI, Includes Pressure Relief Valve If you're looking for a top quality undersink electric tankless water heater, look no further than the RHEEM 208/240V model! This water heater features 5500 watts of heating power and a temperature range of 59 degrees to 140 degrees Fahrenheit. Additionally, it is certified by ANSI and includes a pressure relief valve.


The RHEEM 208/240V Undersink Electric Tankless Water Heater is a water heater that does not use a tank. It is electric and must be plugged into an outlet. It is 5500 watts and 29 amps.


Overall, users seem to be pleased with the product, giving it a 41% five-star rating. There are no one-star reviews.


$267.43 AT AMAZON

, Dimensions - Water Heaters 17-1/2 In. H x 12 In. W x 9 In. D The 480VAC, Commercial Electric Tankless Water Heater, Undersink, 3 Phase is a great choice for those looking for an undersink water heater. This unit is designed for commercial use and can heat water up to 32,000 watts. It has a temperature range of 105 degrees to 110 degrees Fahrenheit and a water connection of 1/2 inch compression. The dimensions of this unit are 17-1/2 inches H x 12 inches W x 9 inches D.


✅ Wattage: 12,000 watts ✅ Amperage: 40 amps ✅ Voltage: 480 volts ✅ Phase: 3 ✅ Connection Type: Threaded ✅ Water Connection Size: 1/2" NPT ✅ Maximum Temperature Rise: 100°F ✅ Minimum Flow Rate: 0.25 GPM ✅ Maximum Flow Rate: 5.0 GPM ✅ Dimensions: 11.5" H x 8.5" W x 4.25" D ✅ Weight: 14 lbs This is an electric tankless water heater that is commercial grade and can be used for residential purposes as well. It has a triple replaceable nickel chrome cartridge insert. It is an undersink water heater with a maximum temperature rise of 100°F. The minimum flow rate is 0.25 GPM and the maximum flow rate is 5.0 GPM. The dimensions are 11.5" H x 8.5" W x 4.25" D. The weight is 14 lbs.


$2021.76 AT AMAZON

The Chronomite Labs 120VAC Undersink Electric Tankless Water Heater is a point-of-use water heater that is 99% energy efficient. It has a compact size and is easy to install, making it ideal for residential or commercial use. The water heater features unlimited hot water, compression fittings, and faucet flow controls. It also includes a default temperature of 140 degrees F.


Number of Gallons Per Minute (GPM):-4 Amperage (amps):-20 Volts:-120 Wattage:-2400 The Chronomite Labs 120VAC Undersink Electric Tankless Water Heater is a point-of-use water heater designed for undersink applications. It has a maximum flow rate of 4 gallons per minute and requires a 20-amp circuit. It is available in 120-volt and 240-volt models.


$300 AT AMAZON

, Temp. Rise @ 2 GPM 34 Degrees F, Temp. Rise @ 3 GPM 41 Degrees F, Height 11-1/8 in, Width 12-1/2 in, Depth 4-3/16 in, Standards cETLus, Includes Hardware The M30/208HTR 110F-I Electric Tankless Water Heater is a point-of-use water heater with a water heater application undersink. It is commercial/residential-use and has a watts of 6,240 W and an amps of 30 A. The voltage is 208 and the min. flow activation is 0.4 gpm. The phase is 1 and the temp. range is 110 degrees Fahrenheit. The water connection is 3/8 in compression and the temp. rise @ 1.5 GPM is 28 degrees Fahrenheit. The temp. rise @ 2 GPM is 34 degrees Fahrenheit. The temp. rise @ 3 GPM is 41 degrees Fahrenheit. The height is 11-1/8 in, the width is 12-1/2 in, and the depth is 4-3/16 in. The standards are cETLus and it includes hardware.


✅ Minimum Temperature: 110 Degrees Fahrenheit The 208VAC, Both Electric Tankless Water Heater, Undersink, 110 Degrees F is an electric tankless water heater that can be used for both commercial and residential purposes. It has a horizontal mounting and an undersink water heater application. The country of origin is subject to change, but it is currently the United States. The minimum temperature is 110 degrees Fahrenheit.


$322.12 AT AMAZON

Positive feelings from past customers

  • Solves issue of getting fast, hot water

  • Easy to replace

  • Cheaper model is a better deal

  • Save money

  • Straightforward installation

Negative feelings from past customers

  • The product does not work well in cold weather

  • The product does not heat water sufficiently

The Bosch US12 Tronic 3000 electric tankless water heater is a great way to get the hot water going in kitchens, offices, at warehouses, service stations, stores, and concession stands. This 12 kW electric heater eliminates long waits for hot water by using a dual chambered copper heat exchanger. The unit runs at 98% thermal efficiency, so stand-by loss is minimal. This model features on-unit thermostatic control, so you can set the water temperature to your desired range. Plus, it mounts on the wall in any direction and is compact and lightweight, making it a great choice for a variety of spaces.


Bosch Electric Tankless Water Heater is a convenient tankless electric water heater that eliminates long waits for hot water at point-of-use. It is easy to install under any bathroom or kitchen sink and get on demand hot water at your every need. The unit is only designed to operate on 240-Volt and features thermostatic control for easy temperature output adjustments to match your preference. With great efficiency, the water heater is 98% efficient with minimal stand-by loss and a water pressure range of 10-150 PSI.


The vast majority of users who have reviewed this product give it high marks, with 46% giving it a full 5-star rating. 19% of users give it just 1 star, however, indicating that there is some room for improvement.


According to user reviews, the Bosch Electric Tankless Water Heater is a great product that is easy to install and provides an endless supply of hot water. This product is perfect for those who want to eliminate the wait time for hot water, as it heats water instantly. Some users have found that this product is slightly more expensive than other similar products on the market, but believe that it is worth the investment.

$206.25 AT AMAZON

Listed, IAPMO Listed, cULus Listed The 240V Undersink Electric Tankless Water Heater is a point-of-use water heater with commercial/residential applications. It has a replaceable nickel chrome cartridge insert and a digital display for thermostatic accuracy. The water heater is active energy management with power modulating controls and microprocessor temperature control. It is also silent operation and easy installation. Finally, the water heater has a high temperature limit switch and is compact size.


Amps - Water Heaters: 27 Volts - Water Heaters: 240 The 240V Undersink Electric Tankless Water Heater is a point-of-use water heater that is designed for undersink use. It can be used for commercial or residential applications. It has a wattage of 6500 and an amp rating of 27.


$700.25 AT AMAZON

, cULus The Eemax AccuMix II electric tankless water heater is a point-of-use water heater that provides continuous hot water on demand with no storage capacity to run out. This water heater features a microprocessor temperature control for thermostatic accuracy of ±1°F at a steady flow rate. The design requires only one cold or hot water line and the model can be installed at point-of-use to help eliminate long pipe runs. The heater mounts in any orientation and is compatible with sensor and non-sensor faucets. The model is suitable for use in handwashing and in kitchen, lavatory, and utility sink applications.


Total Watts: 3500 Volts: 120 Amps: 29 The 120V Undersink Electric Tankless Water Heater is a point-of-use water heater with a commercial/residential design. It has a total watts of 3500 and volts of 120. The amps are 29.


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Positive feelings from past customers

  • The product is easy to install

  • The product is made of high quality materials

  • The product is perfect for small houses or apartments

  • The product provides hot water as advertised

All tankless water heaters must be hardwired and installed by a professional. Product dimensions: 17 x 17 x 3.8 inches Item model number: ECO 11 Size: EcoSmart ECO 11 Electric Tankless Water Heater, 13KW at 240 Color: Gray Style: Contemporary Material: Stainless Steel Power Source: Electric Volts: 240 volts Amperage Capacity: 54 Wattage: 13000 Water Connection Location: Top Finish: Brushed Stainless Steel Number of Handles: 1 Manufacturer Part Number: ECO 11 ASIN: B00T7BQXQS The EcoSmart ECO 11 Electric Tankless Water Heater is perfect for households in colder climates where incoming water temperature is 67 degrees Fahrenheit and above. This model is well suited for heating up to 2 gallons per minute, which is the equivalent of one shower head (with a 1.5 gpm flow) and one sink with a low inlet water temperature. The digital temperature control allows you to set your temperature in increments of 1 degree, and the tankless water heater can be used in colder climates as a point of use for a sink or other low flow application. Prior to purchase and installation, please verify this model is the right size for your hot water needs and electrical requirements. The EcoSmart ECO 11 Electric Tankless Water Heater is a great choice for any home.


The EcoSmart ECO 11 is an electric tankless water heater that is 99% thermal energy efficient. It provides endless on-demand hot water and is 90% smaller than traditional tank heaters. It may be installed on a wall or at point of use. The dimensions are 11.5 x 8 x 3.75 inches.


The user review sentiment for this product is generally positive, with 72% of reviewers giving it a 5-star rating. However, there is a significant minority of 7% of reviewers who give it a 1-star rating, indicating that some users are not satisfied with the product.


According to user reviews, the EcoSmart ECO 11 Electric Tankless Water Heater is a great way to save on energy bills while still providing hot water on demand. This unit is 13KW at 240 Volts with patented self-modulating technology, meaning it will automatically adjust the amount of power it uses based on how much hot water is needed. It also has a digital temperature display so you can always know what the water temperature is, and it comes with a mounting kit for easy installation. Overall, users say this is an excellent water heater that is energy efficient and easy to use.

$250 AT AMAZON

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