Advertising Disclosure Undersink Water Heaters Comparison - April 2026
7 Best Undersink Water Heaters In the UK
Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant's customer service levels, popularity trends, and more. The rankings reflect our opinion and should be a good starting point for shopping. As an Amazon Associate we may earn from qualifying purchases. We may receive a commission from purchases made through links on our site, which will help us continue to provide you with value.
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| 1 Best Choice  9.6Exceptional | 2  9.3Excellent | 3 9.0Very Good | 4 Best Value 8.8Very Good | 5  8.7Very Good | 6  8.4Good | 7 8.1Good |
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ModelAriston 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. | Model Hyco Speedflow 10 Litre 2kW Unvented Water Heater | Model Hyco Speedflow 10 Litre 2kW Unvented Water Heater | Model 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 | Model Water Heater Speedflow Undersink Electric 2kW Slim 15 Litre Tank SF15K by Hyco | Model Speedflow Unvented Undersink Water Heater 15 liter Capacity | Model 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. |
BrandAriston | Brand Hyco | Brand Hyco | Brand Ariston | Brand Hyco | Brand Speedflo | Brand Ariston |
Reviews | Reviews  | Reviews  | Reviews | Reviews | Reviews | Reviews |
Features | ||||||
Easy installation 9.4 | Easy installation 9.4 | Easy installation 9.3 | Easy installation  9.8 | Easy installation 9.3 | Easy installation 8.6 | Easy installation 9.9 |
Lasts a long time 9.8 | Lasts a long time 9.8 | Lasts a long time 9.6 | Lasts a long time 9.6 | Lasts a long time 9.1 | Lasts a long time 9.1 | Lasts a long time 9.8 |
Temperature control 9.9 | Temperature control 9.9 | Temperature control 9.8 | Temperature control 9.4 | Temperature control 9.1 | Temperature control 9.4 | Temperature control 9.8 |
Tech Specs | ||||||
item weight 7.5 kg | item weight 7.6 kg | item weight 7.6 kg | item weight 8.14 kg | item weight - | item weight 10 kg | item weight 7.19 kg |
special features Fast Heating | special features Overheat Protection | special features Overheat Protection | special features Fast Heating | special features - | special features - | special features Fast Heating |
color Silver, Black | color - | color - | color Black | color White | color Red, Silver, White, Blue | color White |
product dimensions 34.6 x 34.6 x 38.5 cm 7.5 kg | product dimensions - | product dimensions - | product dimensions 34.6 x 34.6 x 38.5 cm 8.14 kg | product dimensions - | product dimensions - | product dimensions 29.8 x 29.8 x 38.5 cm 7.19 kg |
energy efficiency class A to G | energy efficiency class - | energy efficiency class - | energy efficiency class A to G | energy efficiency class - | energy efficiency class - | energy efficiency class A to G |
power wattage 3 KW | power wattage - | power wattage - | power wattage 2 KW | power wattage - | power wattage - | power wattage 2 KW |
package dimensions- | package dimensions 46.4 x 33.6 x 30.8 cm 7.6 kg | package dimensions 46.4 x 33.6 x 30.8 cm 7.6 kg | package dimensions - | package dimensions - | package dimensions 53 x 31 x 28 cm 10 kg | package dimensions - |
Available On | Available On | Available On | Available On | Available On | Available On | Available On |
Our Top 3 Picks
Here are the top 3 recommended products with more information to help you find the right product for you
9.6
1Ariston16% OffAriston 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.
9.9 Temperature control9.8 lasts a long time9.4 Easy installationWhy we love it
Durable titanium enamelled tank.
Energy-saving economy setting.
Precise temperature control.
-
9.3
2
HycoHyco Speedflow 10 Litre 2kW Unvented Water Heater
9.9 Temperature control9.8 lasts a long time9.4 Easy installationMain highlights- product type: WATERHEATER
- ensures constant hot water
- Installation above or below the sink
- Hyco Speedflow instantaneous water heater, unventilated, 10 l, 2 kW
-
9.0
3
Hyco
Hyco Speedflow 10 Litre 2kW Unvented Water Heater
9.8 Temperature control9.6 lasts a long time9.3 Easy installationMain highlights- product type: WATERHEATER
- ensures constant hot water
- Installation above or below the sink
- Hyco Speedflow instantaneous water heater, unventilated, 10 l, 2 kW
Our ranking system
The topchoice.co.uk Team selects top-of-the-line items from a wide selection and conducts rigorous evaluations on almost all the products available on the internet. We rank each product based on how well it matches our criteria.We can ensure that the product is well-tested with the help of our expertise, experts, and artificial intelligence technology. topchoice.co.uk requires consistent care for the products we review, ensuring that our assessments are always accurate and up to date.
Features
Our team of experts analyzes key attributes, capabilities, significance, and many more depending on the type of product to determine its effectiveness.
Consumer Reviews
We ensure an evaluation of the ratings using references all over the internet for each product. With the help of our AI technology and professional review teams, we give weight to the worth of individual user experiences.
Popularity
Popularity is an important criterion in choosing a product. Several factors contribute to the popularity of the products on our site, including prestige, relevance, reputation, news, and more.
Value for money
topchoice.co.uk compares product attributes to price, examines tech specs, ratings and reviews, and more.When compared to other criteria, does the pricing seem reasonable? In order to provide genuine value for money, our team must answer that question with advanced calculations.
Value for money
topchoice.co.uk compares product attributes to price, examines tech specs, ratings and reviews, and more.When compared to other criteria, does the pricing seem reasonable? In order to provide genuine value for money, our team must answer that question with advanced calculations.
