10 Best Under Sink Water Heater 15l in The UK

Last updated on 19/08/2025
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Best Choice
1
9.8
Exceptional
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
Ariston
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
9.8
Exceptional
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Best Value
2
9.6
Superb
Ariston ANDRIS R 15 L Undersink Electric Water Heater, 3kW, Control Unit, B class ErP rating, Economy “E” Setting, Manufactured to be installed in UK - 3100834.
Ariston
Ariston ANDRIS R 15 L Undersink Electric Water Heater, 3kW, Control Unit, B class ErP rating, Economy “E” Setting, Manufactured to be installed in UK - 3100834.
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Why We Love It
  • Superior titanium enamelled tank durability.
  • Enhanced performance and user comfort.
  • Optimised energy and heat conservation.
Main Highlights
  • Water heater designed and manufactured to be installed in UK
  • “B” 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 users’ 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
9.6
Superb
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3
9.4
Superb
Ariston Andris Elite WiFi 15l Water Heater Under Sink 4012006 2.5kw White for Sink hot Water heaters
Ariston
Ariston Andris Elite WiFi 15l Water Heater Under Sink 4012006 2.5kw White for Sink hot Water heaters
Free Shipping
Why We Love It
  • Smart control via WiFi.
  • Safe and reliable operation.
  • Energy-saving Eco functions.
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.
9.4
Superb
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4
9.2
Superb
Ariston Andris Lux 15L Under-Sink Unvented Electric Water Heater, 3kW 3100309 - Hanicks
Hanicks
Ariston Andris Lux 15L Under-Sink Unvented Electric Water Heater, 3kW 3100309 - Hanicks
Why We Love It
  • Easy temperature regulation via knob.
  • Durable design with safety features.
  • Efficient and environmentally friendly insulation.
Main Highlights
  • Regulation & Safety Thermostat | Overheat Cut-Out Protection | Environmentally Sound & Efficient Thermal Insulation
9.2
Superb
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5
9.2
Superb
Speedflow Unvented Undersink Water Heater 15 liter Capacity
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
9.2
Superb
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6
9.1
Superb
Save 4%
Ariston Andris Lux 15 litres Under-Sink Unvented Electric Water Heater, 2kW
Ariston
Ariston Andris Lux 15 litres Under-Sink Unvented Electric Water Heater, 2kW
4% Off
Why We Love It
  • Simplicity through a mechanical dial.
  • Reliable copper heating element.
  • Comforting heating cycle indicator.
Main Highlights
  • Fast Reheat Times for instant hot water: ensures quick and efficient heating to meet daily needs
  • Modern, cutting-edge and stylish design: complements any space while maximizing functionality
  • Easy to operate with mechanical dial: simple and intuitive temperature control
  • Installation in 10 easy steps: hassle-free setup with clear instructions for quick installation
  • Titanium enamelled tank and 4-bolt flange for robustness and durability: copper heating element (nickel free) for reliable performance and longevity
  • Copper heating element (nickel free) for efficient heating: ensures long-lasting performance and reduces the risk of corrosion
  • Copper heating element (nickel free) for efficient heating: ensures long-lasting performance and reduces the risk of corrosion
9.1
Superb
Save 4%
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7
9.1
Superb
Save 16%
Ariston Andris Elite WiFi 15l Water Heater Over Sink 4012005 2.5kw White for Sink hot Water heaters
Ariston
Ariston Andris Elite WiFi 15l Water Heater Over Sink 4012005 2.5kw White for Sink hot Water heaters
16% OffFree Shipping
Why We Love It
  • Smart control for convenience.
  • Safe and reliable functionality.
  • Energy saving for small spaces.
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.
9.1
Superb
Save 16%
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8
9.0
Superb
Evolve 15 Liters Undersink Electric Water Heater, 2 Years Warranty, 2kW Control Unit, B Class ErP Rating, UK Plug, overheat Protection and Thermal Cut with Triple Safety Device.
EVOLVE
Evolve 15 Liters Undersink Electric Water Heater, 2 Years Warranty, 2kW Control Unit, B Class ErP Rating, UK Plug, overheat Protection and Thermal Cut with Triple Safety Device.
Why We Love It
  • Extended lifespan due to glasslining.
  • Easy installation with bolt flange.
  • Environment friendly, CFC free.
Main Highlights
  • "Glasslined tank: The tank is lined with glass to provide protection against corrosion and extend the lifespan of the water heater. "
  • "Five bolt flange: The water heater is equipped with a five bolt flange for easy installation and secure mounting. "
  • Magnesium anode: The water heater includes a magnesium anode to prevent corrosion and extend the lifespan of the tank.
  • CFC free: The water heater does not contain any CFCs, which helps protect the environment.
  • Energy saving: The water heater is designed to be energy efficient, helping to reduce energy consumption and lower utility bills.
  • 2 Years Prodcut Warranty, Fully CE & UKCA certified to be installed in the UK Market.
  • Equipped with UK Plug. Water heater designed and manufactured to be installed in UK.
  • Triple safety device: The water heater has three safety features in place to prevent overheating and ensure safe operation. Thermal Cut off Proteching also provided
  • Max rated pressure is 7 to 9 Bar with Wattage from 1500 to 2000 Watts.
  • Constant Temperature: Water Flow with a constant temperature of 2L/min
9.0
Superb
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9
8.9
Excellent
Sararoom 1500W Electric Water Heater, 220V Mini Under Sink Water Heater with LCD Display and Temperature Knob, Instant Water Tap with 15L Water Tank for Kitchen, Lounge, Bathroom, UK Plug
Sararoom
Sararoom 1500W Electric Water Heater, 220V Mini Under Sink Water Heater with LCD Display and Temperature Knob, Instant Water Tap with 15L Water Tank for Kitchen, Lounge, Bathroom, UK Plug
Why We Love It
  • Efficient stainless steel construction.
  • Instant heating saves time.
  • Compact design saves space.
Main Highlights
  • 【Efficient and Durable Stainless Steel Tube, Adapt to Various Water Quality】This small instant water heater adopts high-quality stainless steel tube inner liner, which has strong anti-pollution ability and is not easy to scale or rust, so it can easily cope with complex water environment and ensure that it is still clean and hygienic for long time use. Whether it is hard water, soft water or water with trace impurities, it can operate stably and provide safe and healthy hot water.
  • 【Instantaneous Heating, Energy-Saving and Time-Saving more Efficient】This water heater adopting high efficiency instant heating technology, cold water instantly warms up without pre-heating. The compact single-piece insulation design effectively reduces heat loss and energy consumption, which is environmentally friendly and economical. Whether it's for early morning washing, daily hand washing or kitchen water, it can quickly provide stable hot water to meet your immediate needs.
  • 【Supply Hot Water on Demand, Say Goodbye to Waiting Troubles】While traditional water heaters need to adjust the water temperature repeatedly, this electric water heater can accurately output suitable hot water, which is ready to use, eliminating the long waiting time in front of the sink. Whether it is a sudden need to wash hands, emergency kitchen water, or the trouble of adjusting the temperature before bathing, it can quickly respond to provide comfortable hot water anytime, anywhere.
  • 【Compact and Exquisite, Flexible Installation Does not Take Up Space】Compact and beautifully designed, it can be easily installed in kitchens, bathrooms, lounges or anywhere hot water is needed. This water heater provides powerful hot water performance without taking up valuable space, making it ideal for small homes, flats, offices or rental properties. The concealed installation or wall-mounted design blends perfectly into the home environment, making it both attractive and practical.
  • 【Safe and Reliable, Intelligent Protection is More Worrying】Equipped with intelligent overpressure protection system, when the pressure in the inner liner exceeds the safety value, the pressure relief valve will start automatically, avoiding potential safety hazards. High-quality materials and strict craftsmanship ensure long-term stable operation. Whether it's for daily use at home or in commercial scenarios, this under sink water heater can provide you with lasting peace of mind.
8.9
Excellent
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10
8.8
Excellent
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VINABUKS Electric Water Heater Smart 4.2Gallon RV Camping Outdoor Point of Use 15L Instant Hot Water Heaters Safty Plug Boiler Wash Under Sink Compact Design
VINABUKS
VINABUKS Electric Water Heater Smart 4.2Gallon RV Camping Outdoor Point of Use 15L Instant Hot Water Heaters Safty Plug Boiler Wash Under Sink Compact Design
20% OffFree Shipping
Why We Love It
  • Compact design fits anywhere.
  • Instant hot water anytime.
  • Complete installation kit included.
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 120V 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.
8.8
Excellent
Save 20%
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