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5 Best Small Water Heaters of 2026

Last Updated - 02/04/2026

1
Best Choice

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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.

Stiebel Eltron

STIEBEL ELTRON Small vented Electric Water Heater SNU 10 Plus (GB), Water Heater Under Sink 10 l, Anti-drip Function, thermostop Function, Very Compact, 2 kW, White, 204981

Stiebel Eltron

£160.68

More Details
Main highlights
- SCOPE OF DELIVERY: STIEBEL ELTRON small storage tank SNU 10 Plus (GB), operating and installation instructions, wall bracket.
- SAFETY: Integrated anti-scalding protection. 4-stage temperature limiter.
- INSTALLATION: Vented (Non-pressurized) installation only. Vertical under sink installation only. Simple wall mounting thanks to universal mounting strip. Easy replacement of previous models.
- ENERGY-SAVING WONDER: The most compact of its kind with the lowest power consumption. The energy-saving thermostop function prevents unwanted heating of the mixer tap. Water saving: The anti-drip function prevents dripping when heating up and thus reduces limescale deposits.
- COMFORT FEATURES: Infinitely variable temperature setting via high-quality rotary selector with tactile detent. Space-saving miracle: For more space under the kitchen sink. Award: reddot winner 2023.
- APPLICATION: Vented (Non-pressurised) small electric water heater for the washbasin in the bathroom or the sink in the kitchen.
£160.68
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.

Wijas

Perfect Electronic Undersink Small Water Heater 3.5 kw

Wijas

£129.99

More Details
Main highlights
- To be installed under the sink
- For wash basins
- Energy saving
- Electronic control
- 3.5 kw power
£129.99
3

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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.

YUCHENGTECH

Mini Instant Water Heater Instant Electric Water Heater 3000W Constant Temperature Electric Tankless Water Heater with Remote Control Digital Display for Home Kitchen Bathroom Indoor 220V (White)

YUCHENGTECH

£59.89

More Details
Main highlights
- 【Timely Hot Water Supply】: 3000W power heating system can quickly get hot water without preheating. The highest temperature reaches 55°C/131°F. It is hot as soon as it is opened, and hot water is supplied 24 hours a day, responding to your water demand at any time, bringing you a perfect experience of comfort and relaxation.
- 【Safer to use】: Instant electric hot water heater have a variety of safety protection functions, water and electricity isolation, IPX4 waterproof, leakage protection, dry heating protection, over-temperature and inactive state automatic power-off. Use water safely and securely.
- 【Easy to operate】: The temperature can be adjusted by remote control and touch. Equipped with digital display and touch control panel, LED screen displays the current temperature in real time. The temperature can also be adjusted through the remote control. The operation is very simple and very convenient.
- 【360° Free Installation】: The body of the hot water heater is small and does not take up space. It can be installed upside down, lying down, hanging upright, and tilted. It can be used for the installation of wash cabinets in the bathroom, under the sink, beside the washing machine, etc., to meet different needs.
£59.89
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.

Briwellna

Briwellna Electric Instantaneous Tankless Water Heater 5.5kW 220V, Instant Hot Water Heater with Digital Display for Kitchen Bathroom Sink Counter Under/Above Home Indoor (White)

Briwellna

£108.99

More Details
Main highlights
- [Save Energy and Time] Equipped with the latest integral cast aluminum heating technology, this water heater produces instant hot water without storing water, preheating devices or an attemperator, saving power consumption, water, time and space. It can be shut off by turning off water or power supply
- [On-demand, Umlimited Hot Water] Briwellna Non-Thermostatic Tankless Electric Water Heater is ideal for a single sensor faucet or a single metering faucet for handwashing and other fixed-flow applications.
- [Multiple Security Protection] Smart protection functions protect the product from leakage, over-temperature, dry heating and over-pressure. We offer one-year warranty.
- [Flexible Installation in Any Orientation] The product can be installed at any angle and the display will be automatically adjusted when the product is installed upside down.
- [Easy Installation] Coming with multi-language user's manual, it's easy to install the faucet without plumbers. Video of installation guadiance is available. It can be installed above or under the sink. Please make sure the water pressure required(0.04-0.8MPa) and your breaker panel to dedicate 25A(5500W) double pole breakers solely to the unit. The water connector size is 1/2". Fits both old style 1/2" hose connector and 3/8" water supply system(with adapters).
- [Compact Size Fits Almost Anywhere] This water heater is designed specifically with replacements in mind. The smaller dimensions (210mm×172mm×73mm)makes it easier to swap out your existing less-efficient water heater.
£108.99
5
Best Value
11% 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.

Ariston
11% Off

Ariston AURES Multi Electric Instantaneous Water Heater 9.5kW, Multi-Point, Compact Size, ELCB System, User-Friendly and A Energy Rated. Manufactured to be Installed in UK – 3195216.

Ariston

£110.98

£125.00
(11% Off)

More Details
Main highlights
- Total Safety: Its Double Pole Earth Leakage Circuit Breaker (ELCB) prevents electric shocks, integrating with a total safety device system that avoids damage to the product. If a dangerous voltage is detected, the device will interrupt the electrical circuit as a safety measure.
- Small Size: Aures Multi saves space, no pre-heat time or water storage space required. Aures Multi is ideal for installations in small, narrow spaces like utility rooms, garages, conservatories, kitchens, and bathrooms.
- Quick Comfort: The Aures Multi electric instantaneous water heater delivers hot water within seconds due to its effective heating element which heats water instantly.
- Multi-Point: Aures Multi can supply multiple outlets with hot water (not simultaneously) upon point of use. New Italian premium design
- Instant electric water heater designed and produced for installation in the UK. Awarded the Good Design Award in 2019
- Highly Energy Efficient: The product offers a super efficient performance, lower energy usage and emissions, which give it an 'A' class ErP rating. Its 4-step frontal & intuitive power dial can be set to the level the user wants. Aures Multi is incredibly easy to maintain as all internal components can be accessed through the front.
- Easy to Use: Aures Multi includes a user-friendly frontal dial and LED lights which make the product setup incredibly simple. Because of its flow sensor system, the product works only when a tap is open.
£110.98
£125.00 (11% Off)

5 Best Small Water Heaters of 2026

STIEBEL ELTRON Small vented Electric Water Heater SNU 10 Plus (GB), Water Heater Under Sink 10 l, Anti-drip Function, thermostop Function, Very Compact, 2 kW, White, 204981

Perfect Electronic Undersink Small Water Heater 3.5 kw

Mini Instant Water Heater Instant Electric Water Heater 3000W Constant Temperature Electric Tankless Water Heater with Remote Control Digital Display for Home Kitchen Bathroom Indoor 220V (White)

Briwellna Electric Instantaneous Tankless Water Heater 5.5kW 220V, Instant Hot Water Heater with Digital Display for Kitchen Bathroom Sink Counter Under/Above Home Indoor (White)

Ariston AURES Multi Electric Instantaneous Water Heater 9.5kW, Multi-Point, Compact Size, ELCB System, User-Friendly and A Energy Rated. Manufactured to be Installed in UK – 3195216.

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