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5 Best Under Sink Water Heaters of 2026

Last Updated - 02/04/2026

1
Best Choice

✖
Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

Stiebel Eltron

Stiebel Eltron DCE-S 6/8 Plus Compact Instant Water Heater, Suitable for Showers, Precise Temperature Selection from 20 °C to 60 °C, 238153, 220240 V, White, kW

Stiebel Eltron

£303.26

More Details
Main highlights
- SAFETY: The multi stage safety concept comprises a high limit temperature switch, sensor controlled monitoring of the heating element and detection of air bubbles, effectively protecting the appliance
- INSTALLATION: Quick and easy installation using the improved PROFI-RAPID installation system; The power cable is prepared for the power connection as standard
- ENERGY SAVING: Always accurate water temperature thanks to 4i technology; Power saving mode due to optional ECO function
- CONVENIENCE FEATURES: Straightforward operation and accurate temperature control to the exact degree via a large, backlit multifunction display; Two temperature memory keys (memory function)
- APPLICATION: Fully electronically controlled instantaneous water heater for space-saving over-the-sink installation in showers, kitchens or on sinks in utility rooms
£303.26
2
Best Value
18% Off

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Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

Ariston
18% Off

Ariston Andris Elite WiFi 15l Water Heater Under Sink 4012006 2.5kw White for Sink hot Water heaters

Ariston

£144.24

£174.99
(18% Off)

More Details
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
- 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.
- Electronic temperature regulation for precise control; ideal for customising your hot water heater in the kitchen, bathroom or utility room
- 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
- Anti-legionella function for total peace of mind; this feature makes the ariston water heater safe and reliable
£144.24
£174.99 (18% Off)
3
11% Off

✖
Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

Ariston
11% Off

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.

Ariston

£110.94

£125.00
(11% Off)

More Details
Main highlights
- 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.
- Multi-Point: Aures Multi can supply multiple outlets with hot water (not simultaneously) upon point of use. New Italian premium design
- Instant electric water heater designed and produced for installation in the UK. Awarded the Good Design Award in 2019
- 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.
- 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.
£110.94
£125.00 (11% Off)
4

✖
Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

Ariston

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.

Ariston

£107.19

More Details
Main highlights
- Â€œBâ€ class ErP rating
- Water heater designed and manufactured to be installed in UK
- 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
- Economy' setting on the dial to optimise comfort and energy saving
£107.19
5

✖
Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

Ariston

Ariston ANDRIS R 15 Litre Undersink Electric Water Heater 2kW, Control Unit, B class ErP rating, Economy “E” Setting, Manufactured to be installed in UK - 3100864

Ariston

£119.99

More Details
Main highlights
- “B” class ErP rating
- Water heater designed and manufactured to be installed in UK
- 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
- Economy' setting on the dial to optimise comfort and energy saving
£119.99

5 Best Under Sink Water Heaters of 2026

Stiebel Eltron DCE-S 6/8 Plus Compact Instant Water Heater, Suitable for Showers, Precise Temperature Selection from 20 °C to 60 °C, 238153, 220240 V, White, kW

Ariston Andris Elite WiFi 15l Water Heater Under Sink 4012006 2.5kw White for Sink hot Water heaters

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.

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.

Ariston ANDRIS R 15 Litre Undersink Electric Water Heater 2kW, Control Unit, B class ErP rating, Economy “E” Setting, Manufactured to be installed in UK - 3100864

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