Updated: July, 2025

Best under sink water heaters

Save up to 36% Off

1

BOSCH

9.8

Exceptional

BOSCH Electric Mini-Tank Water Heater Tronic 3000 T 2.5-Gallon (ES2.5) - Eliminate Time for Hot Water - Shelf, Wall or Floor Mounted

14% Off

Picked by 310 users this month

Why we love it

Compact and efficient design.

Quick and easy installation.

Provides instant hot water.

Main highlights

Convenient Point-of-Use
2.5-gallon mini-tank fits under sinks for instant hot water.

Versatile Installation Options
Ideal for small homes, garages, offices, and in-law suites.

Highly Efficient Performance
Customers praise thermal efficiency and fast recovery rate.

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How do we rank?

How do we rank
Our AI-powered platform ranks products using multiple weighted factors from millions of products and user reviews across the web, providing the most valuable and real data. Higher scores rank first.
2

Feelrogast

9.7

Exceptional

Feelrogast Electric Tank Water Heater-8 Gallon Under Sink Instant Hot Water for RV, Camper, Kitchen, Food Truck, 120V 1500W, Wall or Floor Mounted

Main highlights

[Safety Protection] Electrical insulation on inlet/outlet. Leakage protection plug. High-quality insulation. High-temp limiting device and auto temperature control. Multiple layers of protection for safety.

[Instant Hot Water & Rapid Reheat] Feelrogast electric mini tank water heater rapidly heats water, minimizing your wait time and efficiently meeting your hot water needs. The 316 stainless steel heating element achieves up to 99% heat utilization. Temperature is adjustable from 86-167°F for simple, convenient operation.

[High quality and durability] This product is CE, ROHS, and FCC certified, ensuring safety and reliability. The 1.88mm thick stainless steel tank is pressure-resistant and explosion-proof, with a 500-800μm enameled layer using a unique double process to prevent cracking, rusting, and leaks, for long-lasting performance.

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3

ECOTINYMACH

9.4

Excellent

ECOTINYMACH 110V Tankless Water Heater Electric, 3000W Compact Water Heater Under Sink, Conveniently Convertible Between Fahrenheit and Celsius

Main highlights

Easy Installation: Designed with simplicity in mind, our tankless water heater can be installed quickly and easily, saving you time and effort.

Convertible Temperature Scale: Unique feature of our heater allows you to switch between Fahrenheit and Celsius temperature scales conveniently, enabling you to monitor the water temperature in a scale that suits you best.

Compact Design: ECOTINYMACH's tankless water heater is designed with a compact footprint, offering an efficient solution for heating water without consuming unnecessary space.

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4

xwdzswgs

9.3

Excellent

Tankless Water Heater Electric 110V, 3000W Instant Electric Water Heater, Under Sink Water Heater with Digital Display, On Demand Hot Water heater Electric for Kitchen Bathroom Washin

Main highlights

SAFETY INTELLIGENCE RELIABLE - This under sink hot water heater has multiple protection functions. Water and electricity isolation, IPX4 waterproof, leakage protection, dry boil protection, and automatic power off under overheating and inactivity. Prevent leakage and water pipe corrosion. The thermal efficiency of instant hot water heater is as high as 98%, allowing you to enjoy hot water at any time and save energy.

ELECTRIC TANKLESS WATER HEATER - This tankless electric water heater is made of high-quality ABS material, with LED display. With 3000W power, the mini water heater can raise the water by 82° F(0.3GPM) -131° F(0.5GPM) in seconds, providing tankless instant, continuous hot water without waiting for preheating, meeting daily hot water needs. The on demand water heater can set Fahrenheit or Celsius degrees by holding a power button for 6 seconds.

COMPACT AND EFFICIENT DESIGN - The electric water heater tankless adopts an ultra-thin and smooth appearance design, which is beautiful and elegant. The point of use water heater can meet your outlet temperature requirement. The Larger the water flow, the lower the outlet temperature; The smaller the water flow, the higher the outlet temperature. Not Suitable for Shower(Shower normally requires at least 1.8 GPM). Under sink water heater 110v plug in.

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5

Generic

9.2

Excellent

Generic Tankless Water Heater Electric, Instant Hot Water Heater Under Sink, 3000W 110V On Demand Mini Water Heater for RV Kitchen Bathroom, White

Why we love it

Instant hot water in seconds.

Compact for small spaces.

Easy one-touch operation.

Main highlights

Instant Heating Efficiency
With 3000W power, this heater provides hot water instantly, adjustable between 68-122°F.

Space-Saving Design
Ideal for compact spaces like kitchens, bathrooms, RVs, ensuring convenience in limited areas.

Lukewarm Water Performance
Users appreciate its capability for providing lukewarm water, suitable for kitchen use.

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6

CAMPLUX ENJOY OUTDOOR LIFE

9.1

Excellent

CAMPLUX Mini Tank Electric Water Heater 1.3 Gallons Hot Water Heaters 120V, Under Sink Water Heater with Cord Plug 1.44kW

10% Off

Main highlights

OVERHEAT PROTECTION - When the water temperature of the water heater exceeds 203°F, the electric hot water heater will automatically shut down. Protect the safety of you and your family

HIGH QUALITY & LONG LAST - The mini water heater has UL listed and uses a glass-lined tank with good insulation, and freezing mode can prevent the water tank from freezing, ensure a long service life

ADJUSTABLE TEMPERATURE - The point of use water heater has 3 temperature level settings, range from 68°F to 140°F. Thermal efficiency up to 98%

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7

xwdzswgs

9.0

Excellent

Tankless Water Heater Electric 110V, 3000W Instant Water Heater Under Sink, On Demand Hot Water Heater Electric with Digital Display, Electric Mini Water Heater for Kitchen Bathroom Washin

Why we love it

Heats water instantly.

Compact and space-saving.

Easy temperature control.

Main highlights

Instant Hot Water Availability
The heater delivers hot water in 3-5 seconds, eliminating waiting time.

Ideal for Compact Spaces
Perfect for installation under sinks in kitchens, bathrooms, and RVs.

Praised LED Display
Customers appreciate the easy-to-read LED display for temperature settings.

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8

KENUOS

8.8

Very Good

KENUOS 2.5 Gallon Mini Tank Water Heater Under Sink Instant Hot Water Heater,1500W 110V 120V Small Water Heaters with T&P Valve,3-Way Fitting Valve 1/2" NPT for RV,Kitchen,Wall/Floor Mounted Black

36% Off

Main highlights

Safe and Durable-This mini tank water heater features a seamless-welded 304 stainless steel tank and UL-certified construction.Engineered with corrosion resistance,high-pressure tolerance,dry-fire protection,and overheat safeguards.The ABS fireproof casing adds triple-layer protection for ultimate peace of mind

Fast Heating and Quick Recovery-Our 2.5 gallon water heater is equipped with a 1500W L-shaped stainless steel heating tube,maximizing heat exchange efficiency inside the tank.With 95% thermal efficiency,it delivers hot water in 5-8 minutes,No need to wait for hot water for a long time

Easy Installation and User Friendly-Our under sink instant water heater Includes 1/2" NPT fittings,a T&P Valve for pressure release,and a 3-way diverter valve to split hot/cold water.instant hot water heater supports knob adjust,range from 86°f to 150°f temperature control,making temperature adjustment more intuitive and convenient.No extra accessories needed

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9

Ranein

8.5

Good

Ranein 2.5 Gallon Electric Mini Tank Water Heater, 120V 1440W Point of Use Small Instant Updated Model Hot Water Heater, Under Sink, Wall or Floor Mounted, for Under Sink, RV, and Compact Spaces

Main highlights

Rapid Temperature Delivery: The power of the water heater is 1440W and has been upgraded to a molybdenum-gold heating rod, achieving a heating efficiency of up to 99%. It provides hot water quickly and can recover temperature rapidly. The temperature range is from 86℉ to 167℉

Easy installation: Water connection is 1/2" NPT, electrical requirements are 120 Volts (AC), 1440 watts under voltage, with plug connection (Power cord: 43"). Maximum water pressure is 150 PSI and recommended circuit breaker specification is 15 AMPS to ensure complete electrical safety. It is easy to install on RV camping and picnic sinks

Brand New Compact Design: Unlike traditional tank water heaters, it adopts a long and slim design, fitting better under a kitchen sink and cabinet. It can be wall-mounted or installed beneath the sink. The product dimensions are 13"W x 10"H x 10"D

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10

Green Point Home

8.4

Good

Tankless Water Heater Electric Under Sink Water Heater 3500W On Demand Hot Water Heater Portable with Digital Display, Instant WaterHeater for Kitchen

Main highlights

Tankless Water Heater Specifi: 3500W at 110V, household line ≥1.5 square dedicated line, required circuit breaker ≥32AMP, circuit breaker requirement 16A

IMPORTANT: Water heater electric must be mounted vertically and connectors tightened; Displays degrees Celsius only; Requires 13AWG wire and ≥32AMP circuit breaker, water connection 1/2" NPT

Applicable Occasions: Tankless water heater electric are suitable for limited spaces such as kitchens, washbasins, and RVs. Not suitable for showers (showers usually require at least 1.8 gpm)

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Our top pick

1
14% Off

BOSCH Electric Mini-Tank Water Heater Tronic 3000 T 2.5-Gallon (ES2.5) - Eliminate Time for Hot Water - Shelf, Wall or Floor Mounted
The Bosch Electric Mini-Tank Water Heater Tronic 3000 T 2.5-Gallon ES2.5 is a compact and efficient solution for delivering hot water right where you need it. With a 2.5-gallon capacity, this mini-tank fits conveniently under sinks, making it perfect for small homes, garages, offices, and in-law suites. Its versatile installation options allow it to be shelf, wall, or floor mounted, ensuring flexibility to suit various spaces. Users appreciate its thermal efficiency and fast recovery rate, which eliminate the wait for hot water, providing immediate access at up to two sinks simultaneously. The unit is easy to install, requiring just a 120-volt outlet, making it an accessible option for those seeking to enhance their hot water access without extensive plumbing work. Overall, the Bosch Tronic 3000 T is praised for its reliability, performance, and energy efficiency, making it a top choice for point-of-use water heating needs.

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