10 Best Instantaneous Under The Sink Water Heaters in The UK

Last updated on 05/08/2025

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Stiebel Eltron DCE-X Premium Compact Instant Water Heater, Suitable for Showers, Maximum Energy Efficiency, Accurate Temperature delivery, 238159, 220240 V, White, 10/12 kW

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Why We Love It

Energy efficiency at its best.
Accurate temperature delivery always.
Easy and efficient operation.

Main Highlights

Fully electronic compact instantaneous water heater with 4i technology
Maximum energy efficiency and accurate temperature delivery at all times thanks to fully electronic closed-loop control
Easy operation via a large, backlit multifunction display
Particularly energy efficient in ECO mode
High grade design

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‘’

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

VELPAX Mini Electric Water Heater, 10L Electric Instantaneous Water Heate,1500W 220V,Waterproof Under Sink Water Heater with Digital Display for RV Kitchen Bathroom

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Why We Love It

Instant hot water, no waiting.
Durable construction, long-lasting use.
User-friendly, easy installation process.

Main Highlights

【Electric Mini Tank Water Heater】- The Electric Mini Tank Water Heater,1500-watt heating system delivers instant hot water in seconds without preheating,with more safety protection such as anti-freezing protection,over heating protection, 10L of hot water can be output per minute. The maximum temperature raise is 158 °F.
【Durable and Long Service】- The internal materials of instant hot water heater electric 110v are made of high-temperature calcined layer and enamel layer, which have corrosion resistance, rust prevention,and anti-corrosion properties.Stainless steel heating tubes and built-in magnesium rods can effectively purify water quality and extend service life.Integrated stainless steel tank body and Polyurethane CFC-free filling layer ensure the stability of the tank body and excellent insulation.
【Super High Efficiency】- Small Hot Water Heater Energy efficient with plenty of hot water,also known as demand-type or instantaneous water heaters, provide hot water only as it is needed,our water heaters with thermal efficiency up to 90%,Instant hot water at the point of use, whenever needed,Also equipped with a high-definition intelligent digital LED display,effortlessly adjust the temperature between 86°F-158°F according to your preferences.
【Easy Assemble and Use】- This Electric Tank Water Heater,for 1/2" NPT water hose connection,with Leakage protection fitting 1/2" NPT, pressure relief valve, two 3FT hoses,10L small tank water heaters,Compact design,The product dimensions are 14.5 x 8.6 x 10.6 inches, can be wall or floor-mounted in a discreet location.
【Satisfaction Guarantee】- We feel confident that you will love our mini tank water heater. If there's something makes you unsatisfied, please don't hesitate to contact us. We would offer you 100% refund or a replacement within 3 months.

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)

15% OffFree Shipping

Why We Love It

Unlimited hot water on-demand.
Efficient, space-saving design.
Ensures multiple security protections.

Main Highlights

[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.
[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.
[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.
[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
[Multiple Security Protection] Smart protection functions protect the product from leakage, over-temperature, dry heating and over-pressure. We offer one-year warranty.
[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).

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.

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.

4% OffFree Shipping

Why We Love It

Award-winning design and innovation.
Ensures total user safety.
Highly space-saving and efficient.

Main Highlights

Instant electric water heater designed and produced for installation in the UK. Awarded the Good Design Award in 2019
Multi-Point: Aures Multi can supply multiple outlets with hot water (not simultaneously) upon point of use. New Italian premium design
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.
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.
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.

wowspeed 1.5KW Electric Water Heater, 220V 7A Instant Water Heater with Digital Display, Under Sink Tankless Electric Water Heater Suitable for Showers, Water Heat for RV Kitchen Bathroom

3% Off

Why We Love It

Quick hot water anytime.
Compact and portable design.
Energy-saving and safe.

Main Highlights

【Instantaneous Water Heater】 Are you still worried about not having enough hot water when washing dishes? Our instantaneous water heater heats up quickly, saving heating time, with good insulation, providing you with a constant supply of warm water and automatic refilling. Single-piece compact insulation reduces energy consumption. Knob type temperature control makes your operation easier and more convenient
【Energy Saving and Safe Instantaneous Water Heater】Our energy saving under sink water heater is safe and effective. Fast heating reduces the long wait for hot water, get hot water on demand anytime. PREVENT DRY BURNING: When the inner liner is dry and dry, the secondary insulation protection immediately cuts off the power supply and automatically stops the work. INDICATOR LIGHT: When the machine is in the heat preservation state, it will light up a green light
【Safe Electric Water Heater】The electric water heater is made of stainless steel tubing, which is resistant to contamination and can adapt to a variety of complex water quality environments. When the pressure in the inner liner exceeds the safety rated pressure, the safety relief valve will automatically relieve the pressure to protect the liner and your safety. Note: When installing for the first time, please fill up with water first and then turn on the power to avoid burning the heating tube
【Friendly Design】Equipped with a high-definition LED digital display can show the water temperature, to avoid you or your family members being scalded due to high water temperature, to provide safety for your use. Mini electric water heater is lightweight and compact for tight spaces, energy efficient and large water output. Our water heater has a thermal efficiency of up to 90%, can provide hot water anytime, anywhere, and the heating time is only 8-15 minutes (depending on the climate)
【Wide Range of Application】This under sink electric water heater can be placed in tight spaces, suitable for most floor standing, shelf or wall mounted installations, perfect for any tight space, giving you easy access to instant and endless hot water. Can be installed in the kitchen, lounge, bathroom, caravan or anywhere else you want

YUCHENGTECH Mini Instant Water Heater 6500W Electric Tankless Water Heaters with Remote Control Constant Temperature Instant Tankless Hot Water Heater for Home Kitchen Bathroom Indoor 220V

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Why We Love It

Hot water 24/7.
Saves 15%-30% energy.
User-friendly controls.

Main Highlights

【Timely Hot Water Supply】: 6500W 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
【Energy-saving and Power-saving】: Intelligent frequency conversion chip, no need to preheat in advance. The power is automatically adjusted according to the preset water temperature, which is energy-saving and environmentally friendly. Instant electric water heaters save 15%-30% of electricity compared to traditional water heaters
【Easy to operate】: The temperature can be adjusted through the remote control and knob. The LED display screen is equipped with a digital display screen, which can display the current temperature in real time. The temperature can be adjusted by rotating the knob or by using a remote control. The operation is very simple and convenient
【Safe 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
【360° Free Installation】: the body of the Instant electric 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.

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.

8.9

Excellent

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We scanned 394 products

We reviewed these offers relevant to the Instantaneous Under The Sink Water Heaters 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, thermomate, Hyco, VELPAX, Briwellna, Bellanny, Ariston, wowspeed, YUCHENGTECH, WARMCITY, all of which have a reputation for consistently delivering high-quality products that users love and innovative approaches for function & design.

For the best Instantaneous Under The Sink Water Heaters in the market, we considered we took a deep dive into 1971 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 DCE-X Premium Compact Instant Water Heater, Suitable for Showers, Maximum Energy Efficiency, Accurate Temperature delivery, 238159, 220240 V, White, 10/12 kW. We love many things about this product by Stiebel Eltron. What sets it apart from the competition is Energy efficiency at its best. , Accurate temperature delivery always. , Easy and efficient operation.
The best value product for most shoppers and where user satisfaction is continuously the highest is 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 by thermomate based on online reviews by bloggers, experts and online shoppers.
The biggest bargain at the moment for Instantaneous Under The Sink Water Heaters and the best cost-to-value ratio is 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)at Briwellna with a 15% discount.
Our list of the best Instantaneous Under The Sink Water Heaters 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 Instantaneous Under The Sink Water Heaters in The UK

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We scanned 394 products

We concluded that: