10 Best under Sink Water Heaters in the UK 2025
Updated on 17/07/2025
#1
Recommended
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- 2.5KW power rating for efficient heating and an 8-liter capacity for light to medium usage.
- Designed for under-sink installation, perfect for kitchens and utility rooms.
- Durable copper heating element ensures effective heat conduction.
- Energy Class A rating for good efficiency and lower running costs.
- Safety features include overheat protection and pressure relief valve; CE approved.
- Plug-and-play installation with standard UK plug; not portable; requires tank filling before use.
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- 2.5KW power rating for efficient heating and an 8-liter capacity for light to medium usage.
- Designed for under-sink installation, perfect for kitchens and utility rooms.
- Durable copper heating element ensures effective heat conduction.
- Energy Class A rating for good efficiency and lower running costs.
- Safety features include overheat protection and pressure relief valve; CE approved.
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#2
Value for Money
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- Electric mini tank water heater with a 1500-watt system for instant hot water delivery without preheating, providing up to 4 gallons of hot water per minute and a maximum temperature rise of 158°F.
- Constructed with high-temperature calcined and enamel layers for corrosion resistance, featuring stainless steel heating tubes and magnesium rods for improved water quality and longevity.
- Energy-efficient design with thermal efficiency up to 90%, offering hot water on demand with adjustable temperatures between 86°F and 158°F, complemented by a high-definition LED display.
- Simple installation with 1/2" NPT connections, including a pressure relief valve and hoses, compact dimensions of 11 x 11 x 11 inches for versatile mounting options.
- Three-month satisfaction guarantee offering a full refund or replacement for unsatisfied customers.
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- Electric mini tank water heater with a 1500-watt system for instant hot water delivery without preheating, providing up to 4 gallons of hot water per minute and a maximum temperature rise of 158°F.
- Constructed with high-temperature calcined and enamel layers for corrosion resistance, featuring stainless steel heating tubes and magnesium rods for improved water quality and longevity.
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#3
13% Off
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- Advanced instantaneous heating technology for quick hot water access, reducing wait times.
- On-demand water supply for immediate hot water use at sinks, suitable for both domestic and commercial use.
- Constructed from stainless steel for durability and resistance to various water quality conditions, ensuring long-term use.
- Includes safety features such as over-pressure and dry burn prevention for reliable operation.
- Compact design allows for versatile installation options, fitting seamlessly into any room and conserving space.
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- Advanced instantaneous heating technology for quick hot water access, reducing wait times.
- On-demand water supply for immediate hot water use at sinks, suitable for both domestic and commercial use.
- Constructed from stainless steel for durability and resistance to various water quality conditions, ensuring long-term use.
- Includes safety features such as over-pressure and dry burn prevention for reliable operation.
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#4
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- Provides hot water in 20 seconds with an adjustable temperature range of 30-45℃ based on inlet temperature and flow rate.
- Features a digital display for real-time temperature monitoring and easy temperature adjustments for various uses.
- Constructed with durable stainless steel to resist high temperatures, corrosion, and prevent scale buildup.
- Compact tankless design ideal for small spaces, installable under or above sinks without the need for a storage tank.
- Energy-efficient operation heats water on demand, reducing electricity costs, with built-in safety features for safe usage.
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- Provides hot water in 20 seconds with an adjustable temperature range of 30-45℃ based on inlet temperature and flow rate.
- Features a digital display for real-time temperature monitoring and easy temperature adjustments for various uses.
- Constructed with durable stainless steel to resist high temperatures, corrosion, and prevent scale buildup.
- Compact tankless design ideal for small spaces, installable under or above sinks without the need for a storage tank.
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#5
13% Off
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- Compact under-sink water heater provides instant hot water at the touch of a button, eliminating wait times for immediate use.
- Advanced heating technology ensures rapid warming, maintaining a constant flow of hot water while reducing energy consumption.
- Constructed with stainless steel, the heater is durable and effective against varying water qualities, ensuring long-term stable operation.
- Integrated design protects against environmental factors, featuring overpressure and anti-dry burn safety mechanisms for user protection.
- Space-saving and versatile installation options allow for easy placement in various home environments without sacrificing aesthetics.
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- Compact under-sink water heater provides instant hot water at the touch of a button, eliminating wait times for immediate use.
- Advanced heating technology ensures rapid warming, maintaining a constant flow of hot water while reducing energy consumption.
- Constructed with stainless steel, the heater is durable and effective against varying water qualities, ensuring long-term stable operation.
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#6
3% Off
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- Compact tankless water heater design for space-saving installation in tight areas and under sinks.
- User-friendly digital display for easy monitoring of current water temperature.
- Intelligent frequency conversion allows for adjustable water temperatures between 20°C to 50°C, optimizing energy efficiency and performance based on seasonal changes.
- On-demand heating provides instant hot water without waiting, reducing energy consumption and costs.
- Durable stainless steel construction ensures longevity, and tankless design minimizes maintenance and cleaning efforts.
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- Compact tankless water heater design for space-saving installation in tight areas and under sinks.
- User-friendly digital display for easy monitoring of current water temperature.
- Intelligent frequency conversion allows for adjustable water temperatures between 20°C to 50°C, optimizing energy efficiency and performance based on seasonal changes.
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#7
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- 10 Litre capacity suitable for under-sink installation
- Brand: ATC
- Type: Water Heater
- Color: Red
- Designed for efficient water heating
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- 10 Litre capacity suitable for under-sink installation
- Brand: ATC
- Type: Water Heater
- Color: Red
- Designed for efficient water heating
#8
35% Off
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- Designed for installation in the UK
- ErP class B rating
- Economy setting for enhanced comfort and energy efficiency
- Durable titanium enamelled tank providing optimal corrosion protection
- High-density polyurethane insulation maintains water temperature
- Immersion thermostat for precise water temperature control
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- Designed for installation in the UK
- ErP class B rating
- Economy setting for enhanced comfort and energy efficiency
- Durable titanium enamelled tank providing optimal corrosion protection
- High-density polyurethane insulation maintains water temperature
- Immersion thermostat for precise water temperature control
#9
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- External temperature control with neon indicator
- IPX4 water-resistant rating
- Maximum operating temperature of 75°C
- 1.5m pre-wired cable for easy installation
- Can be installed above or below the sink in the correct orientation
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- External temperature control with neon indicator
- IPX4 water-resistant rating
- Maximum operating temperature of 75°C
- 1.5m pre-wired cable for easy installation
- Can be installed above or below the sink in the correct orientation
#10
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- High-efficiency portable water heater with adjustable temperature settings from 30°C to 52°C, depending on the water volume and temperature.
- Instant heating capability allows for immediate hot water delivery without preheating, controlled via a large touch screen for easy temperature adjustment.
- Compact design allows for 360° installation, making it suitable for various setups in kitchens, bathrooms, or public restrooms, while efficiently converting cold to hot water.
- Constructed with nickel-chromium wire technology for improved thermal efficiency, reducing scaling issues. Operates only when hot water is needed, conserving electricity and water.
- Operational guidelines indicate that 3.5kW is recommended for inlet water temperatures above 20°C and may not be suitable for bathroom installations. Professional installation is advised for optimal performance.
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- High-efficiency portable water heater with adjustable temperature settings from 30°C to 52°C, depending on the water volume and temperature.
- Instant heating capability allows for immediate hot water delivery without preheating, controlled via a large touch screen for easy temperature adjustment.
- Compact design allows for 360° installation, making it suitable for various setups in kitchens, bathrooms, or public restrooms, while efficiently converting cold to hot water.
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