10 Best Small Water Heater Under Sink in The UK

Last updated on 16/07/2025

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Bosch Tronic Comfort Compact Hydraulic Water Heater 3.5 kW, Ready to Plug, Under-Sink Device, Pressure- and Pressure-Resistant Connection, White/Grey

3% Off

Why We Love It

Compact design for small spaces.
Efficient hot water generation.
Robust and safe construction.

Main Highlights

Automatic, small instantaneous water heater, thanks to its compact design, ideal for a hand wash basin.
High efficiency in hot water generation: only the required amount of water is heated economically and quickly during the passage.
Thanks to the tubular radiator it is particularly robust and suitable for all water hardnesses. Tested safety by VDE testing institute. Ready-to-use construction, under-sink unit.
Box contents: device, plug cable, mounting rail.
Installation Instructions: Must be fitted by authorized professionals only.

Fudeer 220V 5.5Kw Stainless Steel Instant Electric Water Heater, Mini Tankless Water Heater with Digital Display for Kitchen/Bathroom Sink, Under/Above Counter, Adjustable Temperature 30-45℃(Silver

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Why We Love It

Instant hot water delivery.
Easy temperature control options.
Durable stainless steel design.

Main Highlights

【Instant Hot Water at Your Fingertips】Get hot water within 20 seconds of turning on the heater, with a temperature range of 30-45℃. The water temperature adjusts automatically based on the inlet water temperature and flow rate, providing instant hot water for your daily needs.
【Digital Display & Temperature Control】 Equipped with a clear digital display, this water heater shows real-time water temperature. Use the "+" and "-" buttons to easily adjust the output temperature to your desired level, perfect for washing dishes, hands, or face.
【Durable Stainless Steel Construction】Made with high-quality stainless steel housing and heating elements, this water heater is resistant to high temperatures, corrosion, and rust. The stainless steel design ensures long-lasting durability and prevents scale buildup.
【Compact Tankless Design, Saves Space】 The mini tankless design eliminates the need for a bulky storage tank, making it ideal for small spaces. It can be installed under or above the sink, saving valuable space in your kitchen or bathroom while avoiding scale accumulation.
【Energy Efficient & Safe to Use】 This on-demand water heater heats water only when needed, reducing energy consumption and saving on electricity bills. It features multiple safety protections, including overheating and dry-fire protection, ensuring safe and reliable operation for your home.
【Note】When using hot water, if the water flow rate is very low, the actual water temperature will be very high. (2) Although the faucet temperature is displayed on the screen, the actual outlet water temperature may be slightly different. (3) If you have any questions about the electric faucet, please contact us immediately.

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

14% OffFree Shipping

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.

2KW 220/240V UK Plug 8L Small Under Sink Tank, Thermal Storage Water Heater, Mini Tankless, Under Sink, Electric RV TR Trailer Kitchen Compact Point of Use

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Why We Love It

Powerful and efficient performance.
Saves energy and money.
Easy installation process.

Main Highlights

💧 Point of Use Design The FVSTR 2.16 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.
👌 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 240-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.
🏠 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.Unique insulation technology enables your thermal energy to last longer without wasting a penny，We are truly an environmental protection product

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

Free Shipping

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‘’

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

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)

15% OffFree Shipping

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

Bellanny Mini Electric Water Heater, 1.5KW 220V Electric Instantaneous Water Tap with 10L Water Tank, IP4X Waterproof Under Sink Water Heater with LCD Digital Display & Temperature Knob, UK Plug

13% Off

Why We Love It

Heats water incredibly fast.
Provides hot water instantly.
Durable stainless steel construction.

Main Highlights

【Fast Heating】 This instant water heater adopts advanced instantaneous heating technology, which heats up quickly and greatly saves time waiting for hot water. The single-piece compact insulation design not only reduces energy consumption, but also ensures a continuous supply of hot water. Whether you are washing up in the morning or bathing in the evening, you can turn on the water immediately and enjoy a comfortable living experience.
【On-Demand Water Supply】 This compact water heater eliminates the long wait for hot water at the sink, allowing you to get hot water on demand whenever you need it. Whether you're washing your hands, face or dishes, it's ready to use, providing convenience and comfort. Whether you are a domestic user or a commercial establishment, this water heater is the ideal choice for you.
【Quality Material】This under sink water heater is made of stainless steel tubes with excellent anti-pollution ability, which can adapt to a variety of complex water quality environments. Whether it is hard water or soft water, it can ensure the long-term stable operation of the water heater and extend its service life. High-quality material selection, so you can use it with confidence and peace of mind.
【Safety & Reliability】 This water heater adopts a one-piece moulding design, effectively preventing erosion in bathroom and kitchen environments. Over-pressure protection function: when the pressure in the liner exceeds the safety rated pressure, the safety relief valve will automatically release the pressure. Dry burn prevention function: when the liner dries out, the secondary insulation protection will immediately cut off the power supply and automatically stop working.
【Flexible Installation】 Compact in size, this small electric water heater can be easily placed in the kitchen, lounge, bathroom or anywhere else you need it. The exquisite design not only saves space, but also blends into various home environments and enhances the overall aesthetics. Whether it is wall-mounted or vertical installation, it can meet your personalised needs and make life more convenient.

Mini Instant Water Heater, Electric Instant Water Heater, 220 V 3500 W Adjustable Temperature Instant Water Heater, Electric Instant Water Heater for Kitchen Sink Under The Faucet

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Why We Love It

Instant hot water convenience.
Space-saving compact design.
Efficient energy-saving technology.

Main Highlights

【High Efficiency Portable Water Heater】This is a high efficiency water heater suitable for hot and cold water applications from 30°C to 52°C (adjustable temperature). The temperature of this type of water heater depends on the amount of water in the water heater and the temperature of the incoming water. You can change the small nozzle in our set to adjust the water volume and make the water a little warmer.
【Instant Heating】The mini shower water heater can heat up quickly. Turn on the faucet and there will be hot water immediately, so you don’t have to wait too long. No preheating required. Now turn on the faucet and enjoy fresh hot water from your RV water heater. This mini water heater comes with a large high-resolution touch screen. Directly control the required temperature with one click, making it more convenient to use
【Mini takes up no space】This water heater is small and saves space. Can be installed at 360° angle. This is a water heater that converts cold water into hot water. The 5500W high-performance tankless water heater heats water efficiently, evenly and permanently. This type of water heater is often used in faucets in kitchens, bathrooms or public restrooms to instantly heat water.
【High-Quality Material】Due to the use of nickel-chromium wire technology, the thermal efficiency is higher than traditional heating tubes and is not prone to scaling. This kind of water heater does not need to store water and only starts working when hot water is needed, saving electricity and water. Stable to use even under low water pressure. Engineering plastics have good insulation, and metal casings are not suitable for electric water heaters.
【Note】3.5kW is suitable for environments where the inlet water temperature is above 20°C. It is not recommended to install a 3.5 kilowatt water heater in the bathroom. When used in the shower, the power may be too low to achieve the desired results. Installation is easy, but professional installation is highly recommended. Before connecting the device to power for the first time, make sure cold water is running through the device to avoid dry heat. You must do the wiring yourself.

Luqixcey Electric Water Heater 220V 6000W, Under Sink Instant Tankless Water Heater With 30-55℃ Adjustable Temperature, Remote Control, 2 Modes for Kitchen, Bathroom

Free Shipping

Why We Love It

Instant heating, no waiting.
Smart energy-saving technology.
Comprehensive safety features included.

Main Highlights

【6000W Instant Water Heater】This under sink water heater boasts a maximum power of 6000W, providing instant heating that can raise the water temperature to 40°C in just 5 seconds, with a maximum temperature of 55°C. Once heated to the desired temperature, it will automatically maintain a constant temperature. It has two operating modes, variable frequency and fixed power, offering energy efficiency and high performance to meet various water usage needs.
【Smart Variable Frequency Temperature Control Mode】Our instant water heater features a smart variable frequency temperature control function, allowing manual temperature adjustment between 30~55°C. The power of the water heater can also be automatically adjusted based on the temperature to achieve optimal operation. This not only meets temperature requirements but also ensures efficient energy saving.
【Rated Power Mode】This water heater also offers a rated power mode. In standby mode, long press the UP key to adjust the power between 3500, 4500, and 5500W. In the on state, continue long pressing the power key to enter the gear mode, where you can adjust the power between 1 to 5 levels. Fixed power is more suitable for scenarios that require a stable supply of hot water for extended periods.
【Multi-function Digital Display & Two Control Methods】This electric water heater is equipped with a high-definition digital display screen, which can clearly show information such as water temperature, water flow, and incoming water temperature. We also provide two control methods, touchscreen control and remote control, allowing you to adjust the water temperature and the water heater's switch according to your needs at any time.
【8-layer Safety Protection】Our tankless water heater comes with comprehensive safety protection features, including double insulation, dry burn prevention, water-electricity separation, grounding protection, over-voltage protection, constant temperature anti-scalding, IPX4 waterproof rating, and over-temperature protection. These safety measures ensure the water safety for you and your family.
【Integrated Molded Cast Aluminum Heating Element】This portable water heater adopts an integrated molded cast aluminum heating core, which combines a 304 stainless steel waterway with integrated die-casting, and separates the circuit and the inlet and outlet to achieve water-electricity separation. This not only ensures safety but also enhances the stability of heating.

8.7

Excellent

We scanned 450 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 Bosch Thermotechnik, Fudeer, VINABUKS, FVSTR, thermomate, Hyco, Bellanny, QCXWCJWD, Luqixcey, 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 2251 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 Bosch Tronic Comfort Compact Hydraulic Water Heater 3.5 kW, Ready to Plug, Under-Sink Device, Pressure- and Pressure-Resistant Connection, White/Grey. We love many things about this product by Bosch Thermotechnik. What sets it apart from the competition is Compact design for small spaces. , Efficient hot water generation. , Robust and safe construction. .
The best value product for most shoppers and where user satisfaction is continuously the highest is Fudeer 220V 5.5Kw Stainless Steel Instant Electric Water Heater, Mini Tankless Water Heater with Digital Display for Kitchen/Bathroom Sink, Under/Above Counter, Adjustable Temperature 30-45℃(Silver by Fudeer 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 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)at FVSTR with a 15% 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 450 products

We concluded that: