10 Best Under Sink Hot Water Boiler Electric in The UK

Last updated on 20/08/2025

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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

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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

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.

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.

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

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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.

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‘’

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.

CJHZQYY Instant Electric Water Heater, 3500W Mini Instantaneous Water Heater Without Tank Intelligent Instantaneous Water Heater Heater with Temperature Display for Bathroom Kitchen, UK Plug (White)

9% OffFree Shipping

Why We Love It

Space-saving and versatile installation.
Impressive heating efficiency.
Smart temperature regulation.

Main Highlights

💦This instantaneous water heater is small and space-saving. 360° can be installed arbitrarily without taking up space and can meet your different needs. This water heater can heat up to 50°C. Since the temperature depends on the amount of water in the water heater, the temperature rises faster when the water flow is low. If you use it in winter, please adjust the water flow if the water temperature is not enough.
💦This is a water heater that turns cold water into hot water. The 3500 W high-performance instantaneous water heater heats water efficiently, evenly and permanently. This type of water heater is widely used in kitchen, bathroom or public toilet faucet to heat water instantly.
💦Adopting nickel-chromium wire technology, the thermal efficiency is higher than ordinary heating pipes, not easy to scale. This water heater does not need to store water and only starts working when hot water is needed, saving electricity and water. Stable use even with low water pressure
💦Frequency conversion automatic constant temperature intelligent identification function, according to the water inlet and the set temperature, intelligent automatic adjustment of the power, so that the use effect is better, more power and water saving. Digital LCD temperature display.
💦Water pressure switch + water flow switch: double start switch, easy to deal with high-rise / old building / peak water consumption. Note: Installation is easy, but professional installation is highly recommended. Before connecting the power for the first time, make sure that cold water is flowing through the device to avoid dry heat.

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

31% OffFree Shipping

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

8.7

Excellent

Save 31%

We scanned 1909 products

We reviewed these offers relevant to the Under Sink Hot Water Boiler Electric 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 Ariston, Generic, Fudeer, VINABUKS, WARMCITY, thermomate, Bellanny, CJHZQYY, FVSTR, 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 Hot Water Boiler Electric in the market, we considered we took a deep dive into 9546 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 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. We love many things about this product by Ariston. What sets it apart from the competition is Energy efficiency rated 'A', Eco Evo function saves money, Anti-legionella for safety.
The best value product for most shoppers and where user satisfaction is continuously the highest 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 by Generic based on online reviews by bloggers, experts and online shoppers.
The biggest bargain at the moment for Under Sink Hot Water Boiler Electric and the best cost-to-value ratio is 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 Useat FVSTR with a 31% discount.
Our list of the best Under Sink Hot Water Boiler Electric 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 Hot Water Boiler Electric in The UK

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We scanned 1909 products

We concluded that: