10 Best Under Sink Instant Hot Water in The UK

Last updated on 11/08/2025

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2.5L 1500W Instant Hot Water Tap Boiling Tank 3 in 1 Boiling Water Tap Boiler 4 in 1 Hot Tap Boiling Unit with Filter Change Alarm Temperature Adjustable from 75°C to 98°C

Why We Love It

Adjustable temperatures for versatility.
User-friendly large touch screen.
Auto-Reheat for energy saving.

Main Highlights

Supply 98°C near boiling water to your instant boiling taps with temperature adjustable preset temperatures between 75°C and 98°C,to meet your different daily needs of beverages: 75°C for fruit tea, 80°C for scented tea, 90°C for coffee, 98°C for red tea.
The boiler is designed to be used with an anti-scale water filter (not included). It features a default G3/8" inlet connection and also supports a 1/4" quick-connect option. A 1/4" to G3/8" male adapter is included for compatibility with most water filters available on the UK market. The boiler outlet connects to a boiling water tap via a default G3/8" connection or a 5mm inner diameter silicone hose using the included adapter.
Featuring a user-friendly interface with a large touchscreen display, the boiler allows you to set your preferences effortlessly with a simple tap. A prominent circular LED boiling status indicator makes it easy to monitor at a glance. The display shows both the preset temperature and the current boiling water temperature for added convenience. The upgraded filter change reminder function helps ensure optimal performance—preset to 6 months for soft water areas, and adjustable to 4 months for medium-hard or 3 months for hard water areas.
The boiler features an automatic reheat function, which reactivates heating when the water temperature drops more than 5°C below the preset level, ensuring consistent hot water availability. In energy-saving mode, the boiler stops heating during the programmed sleep period to reduce electricity consumption. An auto power-on function ensures the boiler resumes operation automatically after a sudden power outage, providing added convenience and peace of mind.
Operating pressure: 1.5 to 5 bar. 2 Year Warranty. Important tips: a anti-scale water filter is a must for boiling unit. Please change the water filter every 3-6 month according to water hardness to keep boiler guarantee valid. ****Improper installation may caused leaking, please contact us for professional assistance. **** Boiler is non-pressurized system, not suitable for Qettle, Franke, Quooker taps.

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)

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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.

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)

6% OffFree Shipping

Why We Love It

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

Main Highlights

【Installation Note】that the approval of the relevant distribution network operator (DNO) is required for installation and that the installation of the products may only be carried out by the distribution network operator itself or by an installation company entered in the operator's list of installers.
【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 7.5KW 240V it requires 240 Voltage, 2 x Double-POLE 30AMP, 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
【Installation Note】that the approval of the relevant distribution network operator (DNO) is required for installation and that the installation of the products may only be carried out by the distribution network operator itself or by an installation company entered in the operator's list of installers.
【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
【Installation Note】that the approval of the relevant distribution network operator (DNO) is required for installation and that the installation of the products may only be carried out by the distribution network operator itself or by an installation company entered in the operator's list of installers.

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‘’

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).

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

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

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Why We Love It

Instant 24/7 hot water.
Easy remote controlled temperature.
Versatile and safe installation.

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.
【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.
【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.

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

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.

9.2

Superb

We scanned 1746 products

We reviewed these offers relevant to the Under Sink Instant Hot Water 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 Generic, WARMCITY, FVSTR, thermomate, Briwellna, Bellanny, YUCHENGTECH, wowspeed, QCXWCJWD, 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 Instant Hot Water in the market, we considered we took a deep dive into 8731 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 2.5L 1500W Instant Hot Water Tap Boiling Tank 3 in 1 Boiling Water Tap Boiler 4 in 1 Hot Tap Boiling Unit with Filter Change Alarm Temperature Adjustable from 75°C to 98°C. We love many things about this product by Generic. What sets it apart from the competition is Adjustable temperatures for versatility, User-friendly large touch screen, Auto-Reheat for energy saving.
The best value product for most shoppers and where user satisfaction is continuously the highest is 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) by WARMCITY based on online reviews by bloggers, experts and online shoppers.
The biggest bargain at the moment for Under Sink Instant Hot Water 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 Under Sink Instant Hot Water 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 Instant Hot Water in The UK

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We scanned 1746 products

We concluded that: