10 Best Small Water Heater Under Sink in The UK

Last updated on 21/08/2025

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STIEBEL ELTRON Small vented Electric Water Heater SNU 5 Plus (GB), Water Heater Under Sink 5 l, Anti-drip Function, thermostop Function, Very Compact, 2 kW, White, 204971

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Why We Love It

Optimal temperature with variable settings.
Energy-saving and water-saving wonder.
Easy under-sink installation.

Main Highlights

APPLICATION: Vented (Non-pressurised) small electric water heater for the washbasin in the bathroom or the sink in the kitchen.
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.
ENERGY-SAVING WONDER: The most compact of its kind with the lowest power consumption. The energy-saving thermostop function prevents unwanted heat loss from the mixer tap. Water saving: The anti-drip function prevents dripping when heating up and thus reduces limescale deposits.
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.
SCOPE OF DELIVERY: STIEBEL ELTRON small storage tank SNU 5 Plus (GB), operating and installation instructions, wall bracket.

Speedflow Unvented Undersink Water Heater 15 liter Capacity

Why We Love It

Easy temperature control assurance.
Effortless and time-saving installation.
Flexibility in installation location.

Main Highlights

External temperature control and Neon element - on indicator
IPX4 rated
Maximum working temperature 75 degrees Centigrade
Cable pre-wired (1.5m) - saves time on installation
Units can be sited above or below or below the sink but must be installed the right way up

Speedflow Unvented Undersink Water Heater 10 liter Capacity

Why We Love It

Offers unvented convenience.
Boasts 10 litre capacity.
Ideal for undersink placement.

Main Highlights

Unvented
10 Litre Capacity
Undersink

Ariston Andris Elite WiFi 10l Water Heater Under Sink 4012004 2.5kw White for Sink hot Water heaters

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Why We Love It

Smart control via WiFi.
Safe and reliable heating.
Energy saving features included.

Main Highlights

WiFi compatibility for smart control; ideal for those looking for an electric water heater or a hot water heater with advanced remote management for everyday use and energy saving
Anti-legionella function for total peace of mind; this feature makes the ariston water heater safe and reliable
Eco Evo and Boost functions for energy saving and maximum availability of hot water; suitable for small spaces that require a water heater for sink
Electronic temperature regulation for precise control; ideal for customising your hot water heater in the kitchen, bathroom or utility room
Soft touch buttons for intuitive use; they improve the user experience and make it easier to manage your electric water heater in a practical way.

Electric on Demand 220-240V 2-3KW Hot Water Heaters 10L Safty Plug Point of Use Boiler Wash Under Sink on with Digital Temperature Control Smart Control

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Why We Love It

Compact design saves space.
Adjustable high-temperature limit.
Simple and easy installation.

Main Highlights

Compact and Versatile Design: The VINABUKS Electric Water Heater features a smart 3.3-gallon (15L) tank, perfect for point-of-use applications. Its compact size fits effortlessly under sinks, making it ideal for kitchens, bathrooms, utility rooms, offices, and RVs. This space-saving design ensures hot water is always within reach.
Instant Hot Water: Experience the convenience of immediate hot water at your fingertips. This water heater offers a fast recovery rate, providing instant hot water whenever you need it. The efficient 220V US safety plug ensures safe and reliable performance.
Complete Installation Kit Included: This water heater comes with all necessary accessories for a seamless installation, including 2 PCs compression stainless steel water hoses, 1 pressure relief valve, and 1 tee fitting. The user-friendly design ensures a quick and easy setup process.
High Energy Efficiency: Equipped with advanced insulation materials and a high-efficiency design, the VINABUKS water heater minimizes heat loss and maximizes energy savings. Its rapid heating capability ensures you get hot water on demand, reducing energy consumption and saving on your utility bills.
Durable and Safe Construction: Built to last, the VINABUKS water heater features a high-quality stainless steel tank and a leak-proof design. It includes multiple safety features such as overheat protection and a pressure relief valve. With reliable customer support, you can trust in its long-term safety and performance.

Instant Electric Tankless Water Heater 220/240V, FVSTR Small Smart Portable Self-Modulating on Demand，Use Under Sink Kitchen Household Shower, Hot Water for House Shower [Energy Class A] (Black-2.5KW)

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Why We Love It

Safe and durable design.
Efficient temperature control.
Energy conservation feature.

Main Highlights

【INSTANT HOT WATER HEATER 】- Applied with 7500W/11000W heating system, the electric tankless water heater supplies instant hot water, 3 seconds to get hot water without preheating. Instant consistent and endless hot water of the maximum temperature reach to 55℃/131℉. It is perfect companion for sinks, bringing you perfect experience of comfort and relaxing
【REMOTE CONTROL】 The tankless water heater comes with digital display & touch control panel so temp setting is easy job. Now turn on the tap and let the smart unit do the rest, you needn’t go through hard lesson about temp setting by a mixer tap without any hint. The model comes with Remote control, useful for installation under sink.
【SMART SELF ADJUSTMENT】 The hot water heater adjusts power input based on flow rate and temp setting in real time. For example, less power will be applied by the system when waterflow reduced, thus you still get ideal temperature instead of scalding hot water, which means comfortable experience. Optimal energy efficiency of 98% saves considerable electric charge.
【SAFE and DURABLE】 Applied with multiple protection devices, every piece goes through strict tests to ensure 100% safe. Inner water and electricity lines are designed to run separately so as to avoid leakage or harm of scale build up. Approval by ETL and qualifies for UL, you can expect outstanding performance for years to come..POINT of USE The sleek tankless water heater is compact as an oatmeal box, making it possible to install anywhere close to outlet and avoid energy waste
【Simple Installation】1/2-Inch Water heater connector. In order to install whole house tankless water heater electric 11KW 240V it requires 240 Voltage, 2 x Double-POLE 60AMP, wire gauge 2 x 8AWG, please check to confirm that your breaker panel meet these specifications. 2-year limite warranty and 24/7 customer support services

FVSTR Electric Hot Water Heater 120/240V Small Compact Tank Storage,Rv Tr 2.7 Gallon Trailer 1.5KW Kitchen Instant Under Sink Counter Cupboard, Point of Use RV Stainless Steel Water Hose

13% Off

Why We Love It

Instant hot water whenever needed.
Space-saving compact design.
Easy maintenance with drain valve.

Main Highlights

Point of Use Design The FVSTR 2.7 gallon Electric Water Heater is designed to provide immediate hot water at various points of use, making it ideal for homes, offices, and small commercial settings
Compact and Durable Its compact design saves space, making it suitable for installation in tight spots. The stainless steel construction ensures durability and resistance to corrosion, providing a long-lasting hot water solution
Drain Valve Includes a built-in drain valve for easy maintenance and hassle-free water drainage. This feature simplifies the process of cleaning and maintaining the unit, prolonging its operational life
Easy Installation The compact and versatile design allows for straightforward installation in various locations. Detailed installation instructions are included, ensuring a hassle-free setup process. $Save Money:The 2KW power rating ensures low energy consumption, reducing electricity bills without compromising performance.Designed to provide maximum efficiency with minimal energy usage, making it an economical choice for your hot water needs
Adjustable Thermostat Equipped with a precise adjustable thermostat, this water heater allows you to set and maintain the perfect water temperature for your needs, ensuring comfort and energy efficiency
Standard 120-volt electrical connection , this water heater is easy to install without the need for specialized electrical work, fitting seamlessly into most residential and light commercial environments
💡Note:First time use may take hours to get the hot water. When you first time to use the tank heater ,Must full fill the water heater in the tank,And if you long time not use the tank ,you should pull out the water inside

ATC Pacific 5 Litre Under Sink Water Heater

4% Off

Why We Love It

Generous 5 litre capacity.
Effortless installation options.
Guaranteed 2-year warranty.

Main Highlights

5 Litres
2kW
Easy to install â€“ can be floor or wall mounted
ROHS, CE And SGS approved
2-year warranty

Mini Electric Instant Water Heater for Sink, Stainless Steel On-Demand Hot Water Water Heater Under Sink, 5500W 220V Point-of-use Compact Water Heaters for Home, Kitchen, Bathroom, Garage(Under Sink)

12% OffFree Shipping

Why We Love It

Compact, space-saving design.
User-friendly digital display.
Efficient, on-demand heating.

Main Highlights

【Mini Tankless Water Hear for Sink】With compact and space-saving design, our small water heater is perfect for small spaces, installs easily under sinks or in compact areas without sacrificing functionality. Powered with 5500W and 230V, it still provides robust hot water flow without compromising on space. Outlet water temperature is varied from 20℃ to 45℃ in general.
【Durable Stainless Steel Housing with Sleek LED Temperature Display and Adjustable Power Settings】The durable stainless steel housing of our vented water heater ensures long-lasting performance and adds a sleek, modern aesthetic that complements any kitchen or bathroom. The LED temperature display provides easy monitoring and precise adjustment for personalized comfort, while the adjustable power settings allow for energy-efficient performance tailored to meet varying hot water needs.
【 Hot Water : 20-45℃ Output, Adjustable Temp】The temperature output of our electric water heater for sink typically ranges from 20°C to 45°C. The hot water discharge temperature varies according to the water temperature entering and the flow volume. Tankless technology ensures energy efficiency by heating water on demand, reducing energy costs and environmental impact.
【Space-Savvy Design &Energy Savings at Its Best】Say goodbye to bulky water heaters. Our sleek and modern water heater fits seamlessly into UK kitchens and bathrooms, maximizing space without compromising functionality. Save more on energy compared to traditional storage heaters, as our on-demand design only heats water when you need it. Green living choice for water conservation and cost-effective heating.
【Both Home and Commercial】 Ideal for households, farms, summer house, cafes, garage, and tool rooms, the instant hot water heater for sink suits diverse needs, ensuring everyone has access to hot water when you need it. Install today and experience the convenience of instant hot water with a modern, efficient solution.

ThermoMate ELEX5.5 Instantaneous Electric Water Heater with LED Display, 5.5kW Hand Wash Water Heater for Basins Sinks, Over/Under Sink Water Heaters, ‎Hard Wire 220V

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Why We Love It

Instant heating, endless hot water.
Advanced flow control feature.
Convenient temperature control display.

Main Highlights

【2S INSTANT HEATING & ENDLESS HOT WATER】- Turn on the water tap and endless hot water will come out within 2 seconds on demands when require, hence you will never run out of hot water and only pay for what you really use. Savings of up to 50% on water heating costs.
【EXCLUSIVE ADVANCED FLOW CONTROL & WATER LEAKAGE PREVENTION】- Unique technology is applied to improve water flow and prevent any water from splashing or dripping. You can adjust the flow rate you want to meet your needs in any time. Maximum hot water flow rate: 3L/min
【FLEXIBLE INSTALLATION】- When inverting the installation, the numbers automatically flip over. When the electric washbasin is in operation, the LED displays the current water temperature in real time, so you can easily get hot water at the desired temperature. The temperature range of 35 to 55°C can be selected by touch control.
【EXCEPTIONALLY DURATION】- Built in high quality alloy bare heating element, it is corrosion-resistant and acid-resistant; flowing water prevents limescale from building up, which prolongs its service lifespan.
【TWO INSTALLATION APPLICATIONS OPTIONAL】- Functional for both over sink and under sink installation, display will reverse automatically. Act as primary heater, with water being injected from cold mains directly; Act as booster heater, with hot water being injected from a storage tank. It is free to connect to a mixer tap.Water Inlet and outlet sizes G1/2‘’

8.7

Excellent

We scanned 1564 products

We reviewed these offers relevant to the Small Water Heater Under Sink within online retailers such as Amazon, eBay and other local retailers, ensuring we covered all major brands and models. The products we selected come from trusted brands like Stiebel Eltron, Hyco, Ariston, VINABUKS, FVSTR, ATC, WARMCITY, thermomate, all of which have a reputation for consistently delivering high-quality products that users love and innovative approaches for function & design.

For the best Small Water Heater Under Sink in the market, we considered we took a deep dive into 7821 online reviews , focusing on elements like user satisfaction, performance in real-world conditions, and long-term reliability. Our ranking also evaluates each review’s relevancy, authenticity, up-to-dateness and depth so that the comparison is more sound.

We concluded that:

The clear winner of our analysis is STIEBEL ELTRON Small vented Electric Water Heater SNU 5 Plus (GB), Water Heater Under Sink 5 l, Anti-drip Function, thermostop Function, Very Compact, 2 kW, White, 204971. We love many things about this product by Stiebel Eltron. What sets it apart from the competition is Optimal temperature with variable settings, Energy-saving and water-saving wonder, Easy under-sink installation.
The best value product for most shoppers and where user satisfaction is continuously the highest is Speedflow Unvented Undersink Water Heater 15 liter Capacity by Hyco based on online reviews by bloggers, experts and online shoppers.
The biggest bargain at the moment for Small Water Heater Under Sink and the best cost-to-value ratio is FVSTR Electric Hot Water Heater 120/240V Small Compact Tank Storage,Rv Tr 2.7 Gallon Trailer 1.5KW Kitchen Instant Under Sink Counter Cupboard, Point of Use RV Stainless Steel Water Hoseat FVSTR with a 13% discount.
Our list of the best Small Water Heater Under Sink is updated regularly to reflect new releases and changes in product availability, so be sure to check back often for the latest rankings and discounts.

10 Best Small Water Heater Under Sink in The UK

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We scanned 1564 products

We concluded that: