Advertising Disclosure Instant Water Heater Under Sink Comparison - September 2025
6 Best Instant Water Heater Under Sink 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  9.6Exceptional | 3 Best Value  9.3Excellent | 4  9.0Excellent | 5  8.8Very Good | 6  8.7Very Good |
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ModelInstant Electric Tankless Water Heater 220/240V, FVSTR Small Smart Portable Self-Modulating on Demand?Use Under Sink Kitchen Household Shower, Hot Water for House Shower [Energy Class A] (7.5KW) | Model 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 | Model Briwellna Electric Instantaneous Tankless Water Heater 5.5kW 220V, Instant Hot Water Heater with Digital Display for Kitchen Bathroom Sink Counter Under/Above Home Indoor (White) | 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 | Model Mini Instant Water Heater, Electric Instant Water Heater, 220 V 3500 W Adjustable Temperature Instant Water Heater, Electric Instant Water Heater for Kitchen Sink Under The Faucet | Model Luqixcey Electric Water Heater 220V 6000W, Under Sink Instant Tankless Water Heater With 30-55℃ Adjustable Temperature, Remote Control, 2 Modes for Kitchen, Bathroom |
BrandFVSTR | Brand thermomate | Brand Briwellna | Brand Bellanny | Brand QCXWCJWD | Brand Luqixcey |
Reviews | Reviews | Reviews  | Reviews | Reviews - | Reviews - |
Tech Specs | |||||
product dimensions 40.64 x 25.4 x 12.7 cm 2.42 kg | product dimensions 19 x 16.5 x 9.5 cm 1.3 kg | product dimensions 27 x 20 x 11 cm 2.14 kg | product dimensions 26 x 26 x 28 cm 4.24 kg | product dimensions 28.3 x 28.3 x 33.7 cm 1.35 kg | product dimensions 24 x 24 x 30 cm 1.9 kg |
item weight 2.42 kg | item weight 1.3 kg | item weight 2.14 kg | item weight 4.24 kg | item weight 1.35 kg | item weight 1.9 kg |
included components electric tankless water heater | included components Thermomate 5.5kW electric water heater, installation accessory kit, instruction manual | included components water heater, user's manual, accessories | included components Electric Water Heater | included components Mini Shower System with Electric Tankless Water Heater | included components Streamline Electric Water Heater |
color White | color White | color White | color White | color Silver | color White |
voltage 240 Volts | voltage 230 Volts | voltage 220 Volts | voltage 220 Volts | voltage 220 Volts | voltage - |
batteries required No | batteries required No | batteries required No | batteries required - | batteries required No | batteries required No |
special features Overheat Protection | special features Concealed automatic rotate digital temperature control display | special features Digital Display | special features - | special features Portable | special features - |
wattage 7000 watts | wattage 5.5 KW | wattage 5.5 KW | wattage 1500 watts | wattage - | wattage - |
customer reviews3.7 3.7 out of 5 stars 84 ratings 3.7 out of 5 stars | customer reviews 3.5 3.5 out of 5 stars 76 ratings 3.5 out of 5 stars | customer reviews 3.7 3.7 out of 5 stars 38 ratings 3.7 out of 5 stars | customer reviews 4.7 4.7 out of 5 stars 4 ratings 4.7 out of 5 stars | customer reviews - | customer reviews - |
batteries included No | batteries included No | batteries included No | batteries included - | batteries included - | batteries included - |
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
1FVSTRInstant Electric Tankless Water Heater 220/240V, FVSTR Small Smart Portable Self-Modulating on Demand?Use Under Sink Kitchen Household Shower, Hot Water for House Shower [Energy Class A] (7.5KW)
Why we love it
Instant hot water, no waiting.
Energy-efficient with 98% efficiency.
Compact design, easy installation.
Main highlights- 【Simple Installation】1/2-Inch Water heater connector. In order to install whole house tankless water heater electric 11KW 240V it requires 240 Voltage, 2 x Double-POLE 60AMP, wire gauge 2 x 8AWG, please check to confirm that your breaker panel meet these specifications. 2-year limite warranty and 24/7 customer support services
- 【SMART SELF ADJUSTMENT】 The hot water heater adjusts power input based on flow rate and temp setting in real time. For example, less power will be applied by the system when waterflow reduced, thus you still get ideal temperature instead of scalding hot water, which means comfortable experience. Optimal energy efficiency of 98% saves considerable electric charge.
- 【SAFE and DURABLE】 Applied with multiple protection devices, every piece goes through strict tests to ensure 100% safe. Inner water and electricity lines are designed to run separately so as to avoid leakage or harm of scale build up. Approval by ETL and qualifies for UL, you can expect outstanding performance for years to come..POINT of USE The sleek tankless water heater is compact as an oatmeal box, making it possible to install anywhere close to outlet and avoid energy waste
- 【REMOTE CONTROL】 The tankless water heater comes with digital display & touch control panel so temp setting is easy job. Now turn on the tap and let the smart unit do the rest, you needn’t go through hard lesson about temp setting by a mixer tap without any hint. The model comes with Remote control, useful for installation under sink.
- 【INSTANT HOT WATER HEATER 】- Applied with 7500W/11000W heating system, the electric tankless water heater supplies instant hot water, 3 seconds to get hot water without preheating. Instant consistent and endless hot water of the maximum temperature reach to 55℃/131℉. It is perfect companion for sinks, bringing you perfect experience of comfort and relaxing
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9.6
2thermomate
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
Why we love it
Instant hot water in 2 seconds.
Adjustable temperature with LED display.
Saves up to 50% on heating costs.
Main highlights- 【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‘’
- 【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.
- 【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
- 【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.
- 【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.
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9.3
3Briwellna24% Off
Briwellna Electric Instantaneous Tankless Water Heater 5.5kW 220V, Instant Hot Water Heater with Digital Display for Kitchen Bathroom Sink Counter Under/Above Home Indoor (White)
Why we love it
Compact size fits any space.
Instant hot water, no waiting.
Easy installation, no plumber needed.
Main highlights- [Save Energy and Time] Equipped with the latest integral cast aluminum heating technology, this water heater produces instant hot water without storing water, preheating devices or an attemperator, saving power consumption, water, time and space. It can be shut off by turning off water or power supply
- [On-demand, Umlimited Hot Water] Briwellna Non-Thermostatic Tankless Electric Water Heater is ideal for a single sensor faucet or a single metering faucet for handwashing and other fixed-flow applications.
- [Multiple Security Protection] Smart protection functions protect the product from leakage, over-temperature, dry heating and over-pressure. We offer one-year warranty.
- [Flexible Installation in Any Orientation] The product can be installed at any angle and the display will be automatically adjusted when the product is installed upside down.
- [Easy Installation] Coming with multi-language user's manual, it's easy to install the faucet without plumbers. Video of installation guadiance is available. It can be installed above or under the sink. Please make sure the water pressure required(0.04-0.8MPa) and your breaker panel to dedicate 25A(5500W) double pole breakers solely to the unit. The water connector size is 1/2". Fits both old style 1/2" hose connector and 3/8" water supply system(with adapters).
- [Compact Size Fits Almost Anywhere] This water heater is designed specifically with replacements in mind. The smaller dimensions (210mm×172mm×73mm)makes it easier to swap out your existing less-efficient water heater.
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Features
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Consumer Reviews
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Popularity
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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.
