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Best undersink water heaters - April 2026

Last Updated - April 4, 2026

1
Best Choice

✖
Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

GE

GE Appliances 2.5 Gallon, Versatile Mini Tank Water Heater with Adjustable Thermostat, Easily Installs Under Sink, 120v, GE02P08BAW

GE

$239.00

More Details
Main highlights
- STAINLESS STEEL HEATING ELEMENT - Provides reliable heat with ultra-durable design that resists rust and corrosion
- INTUITIVE CONTROLS - Easily adjust water temperature and power at the turn of a knob to your desired settings
- HOT WATER BOOSTER - Works as a standalone unit, or inline with another water heater to boost long pipe runs or washing machines
- EASY INSTALLATION - Installs in minutes with existing plumbing. Uses standard 1/2-in NPT water connections for simple wall or floor mounted installation
- COMPACT DESIGN - Ideal in limited spaces like kitchens, bathrooms, laundry rooms, barns, cabins, RVs, garages, sheds, pet washing station, etc
$239.00
2

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Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

thermomate

ThermoMate Mini Tank Water Heater Electric, 6.5 Gallons Small Under Sink Water Heater for Point of Use Instant Hot Water 110V 120V, Wall or Floor Mounted, UL Listed ES700

thermomate

$229.99

More Details
Main highlights
- Specifications and Warranty - Dimensions: 17.7"H x 17.7"W x 14.6"D; Weight:26.5lbs; Water connections: 1/2" NPT, Electrical requirements: 1.44 kW at 120 volts, plug-in connection with 2 feet power cord; Max water pressure:150PSI; Nominal current: 12A. 3-year Limited Warranty for the tank, 1-year warranty for parts and 24hours customer service
- Premium Quality & Durable - Glass-lined tank for great insulation, temperature and pressure relief valve included, UL Listed ensuring a long service life
- No More Wait for Hot Water - Point of use 6.5 gallons mini tank water heater provides instant hot water where you need it with fast recovery, reducing standby loss. Thermal efficiency up to 99%
- Easy Installations - Dimensions 17.7" x 17.7" x 14.6" compact design, can be wall or floor mounted under sink / counter, plug into 120V outlet, Nominal current 12amps
- Adjustable Temperature - Thermostat with 3 temperature level settings, range from 50°F to 149°F with high temperature limit protection, also a freeze mode to prevent tank from freezing
$229.99
3
Best Value
10% Off

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Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

Nessxa
10% Off

Electric Mini Tank Water Heater, 1.6Gallon Under Sink On Demand Hot Water Heater, Wall or Floor Mounted, 1500W Point of Use Instant Hot Water for RV Kitchen Bathroom Restaurant

Nessxa

$89.99

$99.99
(10% Off)

More Details
Main highlights
- WHAT YOU GET: 1 x electric hot water heater, 1 x accessory pack, 1 x user manual. Size: 10.83" x 10.83" x 9.61", Capacity: 6L / 1.6 Gallons, Rated Power: 1500W, Voltage: 110V / 60Hz, Current: 10A, Rated Pressure: 0.8MPa, Water Connections: 1/2" NPT, Waterproof Rating: IPX4. We stand behind our calentador de agua eléctrico with comprehensive customer support. If you have any questions, please feel free to contact us via email at any time.
- USER-FRIENDLY DIGITAL DISPLAY & OPERATION: Designed for effortless control, this under sink water heater features a clear digital display and an intuitive rotary knob. Easily adjust your desired water temperature from 86°F to 167°F (30°C to 75°C), with the real-time water temperature shown on the screen. Please Note: The on demand hot water heater electric must be completely filled with water before the instant hot water heater is switched on for the first time to ensure proper operation.
- TEMPERATURE CONTROL & SAFETY: The under sink water heater's built-in thermostat automatically shuts off and enters energy-saving mode once it reaches your set temperature (up to 167°F), then seamlessly restarts heating when the water cools, ensuring an uninterrupted supply. The electric water heater's heating indicator light turns off during standby for clear status. Equipped with a 199°F over temperature protection cut-off device.
- INSTANT HOT WATER & HIGH EFFICIENCY: Say goodbye to waiting for hot water. This 1.6gallon (6L) point-of-use mini-tank water heater delivers hot water instantly right where you need it. Powered by a 1500W heating element for fast recovery, its compact design and 99% thermal efficiency significantly reduce standby heat loss compared to large traditional tanks, providing immediate comfort while saving energy.
- DURABLE CONSTRUCTION & SUPERIOR MATERIALS: This instant water heater under sink features a robust 1.5mm steel tank lined with a 0.2-0.5mm blue enamel layer, offering excellent insulation and outstanding resistance to rust. The on demand water heater's heating element is made of durable SS316 stainless steel. Housed in a 2.5mm sprayed plastic shell with thick polyurethane foam insulation, it guarantees both structural integrity and maximum heat retention.
$89.99
$99.99 (10% Off)
4

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Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

BISELONG

110V-120V 1440-1500W Small Under Sink Tank 2.5 Gallon Water Heater Hot Storage,Mini Instant Electric RV TR Trailer Kitchen Compact,Food Truck 2 PCs 16” Long 1/2”FIP Stainless Steel Hose (BI-2.5)

BISELONG

$99.98

More Details
Main highlights
- 【Safety protection】 Certified by CE, ROHS, and FCC for safety and reliability. Electrical insulation at the entrance/exit. Leak proof plug. High quality insulation material with high temperature limiting device and automatic temperature control. Multi layer protection ensures safety.
- 【Rapid Temperature Recovery】The BISELONG water heater is made from 0.04inch (1.1mm) thick 304 stainless steel and uses laser welding technology, ensuring it never rusts, withstands high pressure, and doesn't leak! The 1500w "L" shaped heating element increases the heat exchange area with the water in the tank, speeding up the heating process and eliminating the long wait for hot water beside the sink! (It can heat up to your desired temperature in 8-15 minutes for up to two sinks at a time).
- 【Product Upgrade】On June 25, 2023, the product was fully upgraded—the water heater’s 304 stainless steel lining will be thickened to 0.04 inches (1.1 millimeters), providing a longer service life, and the unit weight increased to 8.4lbs (3.8 kilograms). The insulation material and foam insulation were replaced, improving the Improved insulation effect, making it more energy-efficient!
- 【Note】Due to the improvement in product quality, the warranty period for water heaters purchased after July 4, 2023, is 2 years. According to buyer feedback, some water heaters had quality issues. Based on the photos provided by the buyers, it was found that they mistakenly installed the pressure relief valve at the outlet (red end)!
- 【Energy-Saving Smart Inverter】Automatically keeps water warm and stores hot water. The compact 2.5-gallon tank can be installed under the sink, with a thermal efficiency of 99% and a maximum temperature of 149℉. It has a built-in smart chip that heats to the temperature you set, and when it reaches the desired temperature, it automatically insulates to keep the heat in.Additionally, it helps reduce scale buildup!
- 【Easy Installation】Water connection tube is 1/2''FPI, electrical requirements: 120v (AC), single voltage: 1500w with plug connection wire, maximum water pressure 108PSI, recommended circuit breaker rating: 15Amps, BISELONG electric water heater can be installed on walls or floors, in a concealed position.
- 【Customer Service】If there are any quality issues with the product or problems with installation, you can contact us at any time. Our customer service is online for 16 hours!！
- 【Compact Design Saves Space】BISELONG has always been committed to original design! Its compact, square design makes this water heater ideal for homes, under sinks, RVs, food trucks, and more. It can be installed in cabinets or used in conjunction with washing machines and dishwashers. The product dimensions are 13.0''L x 11.4''W x 10.6''H inches.
$99.98
5

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Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

Nessxa

Nessxa 4 Gallon Electric Mini Tank Water Heater, 110V 1500W Point of Use On Demand Under Sink Instant Hot Water Heater for Home Kichen Bathroom

Nessxa

$139.99

More Details
Main highlights
- WHAT YOU GET - You will receive a high-performance electric storage water heater with a complete accessory kit and a detailed instruction manual. NOTE: To avoid installation errors that may affect your use, please have a professional install this water storage heater.
- SAVING ENERGY & TEMPERATURE CONTROL - Our under sink water heater has a temperature adjustment range of 77 ℉ -176 ℉ (25 ℃ -80 ℃). You only need to rotate the knob on the electric water heater panel according to your needs. When the water temperature in the instant hot water heater is below 77 ℉/25 ℃, the mini tank water heater will be in standby mode, maximizing energy and power savings. The adjustable thermostat allows you to set your desired water temperature, providing maximum comfort and convenience.
- EASY USE & SAFETY MATERIAL - With a mini tank compact design, can be wall or floor mounted under sink or counter. The exterior of the small tank water heater is made of ABS material, and the internal tank body is made of stainless steel material, achieving the separation of water and electricity, ensuring that you can safely use the point of use under sink water heater, which ensures fast heating speed of the water heater.
- APPLICABLE SCENARIOS - Our under sink water heater, with its outstanding performance and wide applicability, has become the ideal choice for various scenarios, including homes, hotels, restaurants, and hospitals, ensure a reliable 24-hour hot water supply in the cold winter.
- 24H INSTANT HOT WATER - Our mini tank water heater delivers hot water instantly at your sink. With a 4 gallon tank, it provides instant hot water on demand, reducing wait times and water waste. The high-density polyvinyl chloride integral foaming process can uniformly heat the entire internal storage tank, improving durability and performance.
$139.99

Best undersink water heaters - April 2026

GE Appliances 2.5 Gallon, Versatile Mini Tank Water Heater with Adjustable Thermostat, Easily Installs Under Sink, 120v, GE02P08BAW

ThermoMate Mini Tank Water Heater Electric, 6.5 Gallons Small Under Sink Water Heater for Point of Use Instant Hot Water 110V 120V, Wall or Floor Mounted, UL Listed ES700

Electric Mini Tank Water Heater, 1.6Gallon Under Sink On Demand Hot Water Heater, Wall or Floor Mounted, 1500W Point of Use Instant Hot Water for RV Kitchen Bathroom Restaurant

110V-120V 1440-1500W Small Under Sink Tank 2.5 Gallon Water Heater Hot Storage,Mini Instant Electric RV TR Trailer Kitchen Compact,Food Truck 2 PCs 16” Long 1/2”FIP Stainless Steel Hose (BI-2.5)

Nessxa 4 Gallon Electric Mini Tank Water Heater, 110V 1500W Point of Use On Demand Under Sink Instant Hot Water Heater for Home Kichen Bathroom

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