Advertising Disclosure Undersink Water Heaters Uk Comparison - August 2025
7 Best Undersink Water Heaters Uk 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. By purchasing the products we rank, you’ll get the lowest price we found while we may receive a commission at no cost to you, which will help us continue to provide you with value.
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| 1 Best Choice  9.7Exceptional | 2  9.4Excellent | 3  9.3Excellent | 4 Best Value  9.2Excellent | 5  9.0Excellent | 6  8.9Very Good | 7  8.6Very Good |
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ModelAriston 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 | Model 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. | Model Triton Water Heater | Instaflow | 7.7kW | Electric Water Heater I Instant Water Heater | Tankless Electric Water Heater | Undersink Water Heater | SPINSF07MW | White | Model Triton Showers Electric Water Heater | 15L Tank | Undersink Electric Water Heater | Instaflow | 2kW | Model Evolve 10 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. | Model 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 | Model 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 |
BrandAriston | Brand Ariston | Brand Triton Showers | Brand Triton Showers | Brand EVOLVE | Brand FVSTR | Brand Bellanny |
Reviews | Reviews  | Reviews | Reviews | Reviews | Reviews  | Reviews |
Features | ||||||
Easy installation 8.6 | Easy installation 9.4 | Easy installation  9.9 | Easy installation 9.6 | Easy installation 9.4 | Easy installation 9.3 | Easy installation 9.1 |
Tech Specs | ||||||
product dimensions 34.2 x 36 x 38.5 cm 8.46 kg | product dimensions 34.6 x 34.6 x 38.5 cm 7.5 kg | product dimensions 50 x 50 x 50 cm 100 g | product dimensions 39 x 44 x 46.5 cm 1 kg | product dimensions 36 x 36 x 35 cm 5 kg | product dimensions 24 x 24 x 33.48 cm 3.7 kg | product dimensions 26 x 26 x 28 cm 4.24 kg |
item weight 8.46 kg | item weight 7.5 kg | item weight 100 g | item weight 1 kg | item weight 5 kg | item weight 3.7 kg | item weight 4.24 kg |
customer reviews4.5 4.5 out of 5 stars 123 ratings 4.5 out of 5 stars | customer reviews 4.4 4.4 out of 5 stars 56 ratings 4.4 out of 5 stars | customer reviews 4.2 4.2 out of 5 stars 11 ratings 4.2 out of 5 stars | customer reviews 4.9 4.9 out of 5 stars 17 ratings 4.9 out of 5 stars | customer reviews 5.0 5.0 out of 5 stars 1 rating 5.0 out of 5 stars | customer reviews 3.9 3.9 out of 5 stars 113 ratings 3.9 out of 5 stars | customer reviews 4.7 4.7 out of 5 stars 4 ratings 4.7 out of 5 stars |
color White | color Silver, Black | color White | color White and Stainless Steel | color White | color White | color White |
special features Fast Heating | special features Fast Heating | special features IP25 water ingress protection, A energy rating, heats water on demand with smooth power selection | special features - | special features Thermal Cut off Protection, Security Assurance, Corrosion Free, Lightweight, Overheat Protection, Constant Temperature Water Flow | special features Fast Heating | special features - |
included components Pressure relief valve, dielectric junctions, wall bracket, installation manual, warranty certificate | included components - | included components no components | included components Wall-Mounted Bracket, Pressure Relief Valve, Dielectric Junctions supplied | included components 10 Liters Electric Water Heater, Inbuilt 3 Way Plug with 1.2 mts 3 Core wire, Safety Relief Valve, Wall Hanging Bracket, Instruction Manual | included components - | included components Electric Water Heater |
voltage 240 Volts | voltage - | voltage - | voltage - | voltage 220 Volts | voltage 120 Volts AC | voltage 220 Volts |
wattage 2.5 KW | wattage - | wattage - | wattage 2 KW | wattage 2 KW | wattage - | wattage 1500 watts |
item package quantity 1 | item package quantity - | item package quantity 1 | item package quantity 1 | item package quantity 1 | item package quantity - | item package quantity - |
plug profile- | plug profile - | plug profile Wall | plug profile Wall | plug profile Wall | plug profile - | plug profile Wall |
batteries required No | batteries required - | batteries required No | batteries required No | batteries required - | batteries required - | batteries required - |
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
9.7
1AristonAriston 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
8.6 Easy installationWhy we love it
The Andris Lux Eco has a first in class ErP rating of A across all models.
The Eco Evo function saves up to 15 on your energy bill by remembering when and how much hot water you use.
The monthly anti legionella function eliminates the risk of legionella bacteria developing.
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9.4
2Ariston
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.
9.4 Easy installationWhy we love it
Durable titanium enamelled tank.
Energy-saving economy setting.
Precise temperature control.
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9.3
3Triton Showers
Triton Water Heater | Instaflow | 7.7kW | Electric Water Heater I Instant Water Heater | Tankless Electric Water Heater | Undersink Water Heater | SPINSF07MW | White
9.9 Easy installationWhy we love it
Easy to install with clear instructions.
Provides instant hot water on demand.
Compact size, saves space.
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.
