10 Best Under Sink Water Heaters in The UK

Last updated on 27/06/2025

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Best Choice

9.7

Exceptional

Hyco

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

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.

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 (Cream)

12% OffFree Shipping

Why We Love It

Instant, unlimited hot water supply.
Compact size for easy replacement.
Smart protection for safe use.

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

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] (7.5KW)

4% OffFree Shipping

Why We Love It

Instant and sufficient hot water.
Convenient digital display control.
Compact and versatile positioning.

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

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

12% OffFree 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‘’

Ariston ANDRIS R 10 L Undersink Electric Water Heater, 2kW Control Unit, B class ErP rating, Economy “E” Setting, Manufactured to be installed in UK - 3100863.

35% OffFree Shipping

Why We Love It

Optimized comfort and energy saving.
Enhanced durability with titanium tank.
Precise water temperature adjustment.

Main Highlights

Water heater designed and manufactured to be installed in UK
Â€œBâ€ class ErP rating
Economy' setting on the dial to optimise comfort and energy saving
Titanium enamelled tank for durability: This premium quality water heater the best tank protection with the properties of titanium, wich constitutes a perfect shield against corrosion. Every single component is developed to ensure longlasting high performance with the guarantee of Ariston Brand
Maximum Comfort: Andris series products are able to keep the water hot for a long time thanks to the thick high-density polyurethane insulation placed in the tank and the outside of the water heater. It provides an effective barrier against heat losses, optimizing both the performance of the product and the usersâ€ comfort. The models of the Andris series are equipped with an immersion thermostat, which allows a very precise adjustment of the water temperature, heating it to the desired point
Installation kits to be purchased separately

Ariston ANDRIS LUX ECO 15 L Undersink Electric Water Heater 2.5kW with A Titanium Enamelled Tank, A Class Erp Rating, Copper Heating Element, Manufactured To Be Installed In UK - 3100722, White

Free Shipping

Why We Love It

Energy efficiency rated 'A'.
Eco Evo function saves money.
Anti-legionella for safety.

Main Highlights

Water heater designed and manufactured to be installed in UK
First in Class ErP rating “A” across all models: With its electronic temperature control and its Eco Evo Function, the Andris Lux Eco is an energy efficient electric water heater boasting an “A” ErP energy rating across the whole range
“Eco Evo” function: Thanks to the ECO EVO function, Andris Lux Eco remembers when and how much hot water you use. In this way the function will not only provide hot water efficiently, buti t will also and above all saving up to 15 Percentage on your energy bill
Anti-legionella function for total peace of mind: Once a month, this mini-tank electric water heater automatically increases the water temperature up to 65°C, in order to eliminate the risk of legionella bacteria developing. Ideal for applications such as hospitals, schools and care homes
Eco Display: The unit’s smart, user-friendly display is easy to use and provides precise electronic temperature control, allowing the user to set the desired temperature for every need. The button “ECO” indicates when the Eco Evo Mode is activated and the LED indicator provides a visual guide to the water temperature inside the tank. In yhis way, you can have the hot water you need, when you need it, without any effort
Titanium Enamelled TankEnhanced Anti-Corrosion: With its proprietary titanium tank engineering, the Andris Lux Eco boasts exceptional durability and an extended product life. In addition, with its robust 4 bolt flange and copper heating element, this efficient water heater offers improved protection against water corrosion
Ideal Installations: Medical Environments Laboratories School Facilities
Fully UKCA certified to be installed in the UK Market

Mini Electric Instant Water Heater for Sink, Stainless Steel On-Demand Small Vented Undersink Water Heater, 5500W 220V Point-of-use Compact Geyser for Home, Kitchen, Bathroom, Garage(Silver)

3% OffFree Shipping

Why We Love It

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

Main Highlights

Compact Design: This tankless water heater has a sleek, water heater for sink,cylindrical shape that is ideal for space-constrained areas. The cylindrical shape optimizes vertical space, allowing you to maximize available area. Its compact size enables installation in tight spaces or under sink installations, freeing up valuable storage and counter space. This makes it an ideal choice for small apartments or homes with limited room.
Digital Display: Unleash the convenience of our state-of-the-art electric water heater, where a user-friendly digital display comes to the fore. Its intuitive interface prominently displays the current temperature, granting you the precision you need for tailored water temperature control at a glance. This sleek design ensures a seamless experience, bringing control and comfort to your daily routines.
Intelligent Frequency Conversion Design: Indulge in the convenience of our intelligent electric water heater, featuring a cutting-edge frequency conversion design. Easily regulate the water temperature to suit your preferences, from a refreshing 20°C to a warm 50°C. In spring and summer, you’ll appreciate its energy-saving efficiency without any sauna-like heat, ensuring a gentle, low-power performance. As the weather turns cooler, our heater swiftly delivers high-power, rapid heating, letting you enjoy hot water without the waiting times typically associated with traditional systems.
Efficient and Effortless Hotness: Unlike traditional tank-based systems that store and reheats water, this tankless model heats water on-demand. This means the water is instantaneously heated as it flows through, ensuring you never have to wait for tepid water again. It saves you energy by only consuming power when you’re actively using it, promoting eco-friendliness and cost-effectiveness.
Durable Construction and Maintenance-Friendly: Crafted from high-quality stainless steel, this heater is built to withstand daily use. With a tankless design, you don’t have to worry about regular water storage maintenance. The compact nature also simplifies cleaning, as there’s no hard-to-reach tank to clean or replace.

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

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.

VELPAX Mini Electric Water Heater, 15L Electric Instantaneous Water Heate,1500KW 220V,Waterproof Under Sink Water Heater with Digital Display for RV Kitchen Bathroom

Free Shipping

Why We Love It

Instant hot water availability.
Durable and corrosion-resistant materials.
High efficiency saves energy.

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, 15L 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,15L small tank water heaters,Compact design,The product dimensions are 11 x 11 x 11 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.

8.7

Excellent

We scanned 1348 products

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

For the best Under Sink Water Heaters in the market, we considered we took a deep dive into 6741 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 Speedflow Unvented Undersink Water Heater 15 liter Capacity. We love many things about this product by Hyco. What sets it apart from the competition is Easy temperature control assurance. , Effortless and time-saving installation. , Flexibility in installation location.
The best value product for most shoppers and where user satisfaction is continuously the highest is 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. by Ariston based on online reviews by bloggers, experts and online shoppers.
The biggest bargain at the moment for Under Sink Water Heaters and the best cost-to-value ratio is Ariston ANDRIS R 10 L Undersink Electric Water Heater, 2kW Control Unit, B class ErP rating, Economy “E” Setting, Manufactured to be installed in UK - 3100863.at Ariston with a 35% discount.
Our list of the best Under 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 Under Sink Water Heaters in The UK

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We scanned 1348 products

We concluded that: