10 Best Water Heater 15l in The UK

Last updated on 16/07/2025

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Ariston 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

6% Off

Why We Love It

Energy efficiency rated 'A'.
Eco Evo function saves money.
Anti-legionella for safety.

Main Highlights

Water heater designed and manufactured to be installed in UK
First in Class ErP rating “A” across all models: With its electronic temperature control and its Eco Evo Function, the Andris Lux Eco is an energy efficient electric water heater boasting an “A” ErP energy rating across the whole range
“Eco Evo” function: Thanks to the ECO EVO function, Andris Lux Eco remembers when and how much hot water you use. In this way the function will not only provide hot water efficiently, buti t will also and above all saving up to 15 Percentage on your energy bill
Anti-legionella function for total peace of mind: Once a month, this mini-tank electric water heater automatically increases the water temperature up to 65°C, in order to eliminate the risk of legionella bacteria developing. Ideal for applications such as hospitals, schools and care homes
Eco Display: The unit’s smart, user-friendly display is easy to use and provides precise electronic temperature control, allowing the user to set the desired temperature for every need. The button “ECO” indicates when the Eco Evo Mode is activated and the LED indicator provides a visual guide to the water temperature inside the tank. In yhis way, you can have the hot water you need, when you need it, without any effort
Titanium Enamelled TankEnhanced Anti-Corrosion: With its proprietary titanium tank engineering, the Andris Lux Eco boasts exceptional durability and an extended product life. In addition, with its robust 4 bolt flange and copper heating element, this efficient water heater offers improved protection against water corrosion
Ideal Installations: Medical Environments Laboratories School Facilities
Fully UKCA certified to be installed in the UK Market

Ariston Andris Lux 15L Under-Sink Unvented Electric Water Heater, 3kW 3100309 - Hanicks

Why We Love It

Easy temperature regulation via knob.
Durable design with safety features.
Efficient and environmentally friendly insulation.

Main Highlights

Regulation & Safety Thermostat | Overheat Cut-Out Protection | Environmentally Sound & Efficient Thermal Insulation

Triton Showers Electric Water Heater | 15L Tank | Undersink Electric Water Heater | Instaflow | 2kW

Why We Love It

Smooth temperature settings adjustment.
Prevents corrosion build up.
Two years parts warranty.

Main Highlights

15 Litre Stored Water Tank for small bathrooms and hand basins
Smooth temperature settings on the front of the unit for easy adjustment
Top temperature of 75ᵒC
Stainless steel tank with enamel lining to prevent any corrosion build up
Two Years Parts and Labour

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.

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Why We Love It

Superior titanium enamelled tank durability.
Enhanced performance and user comfort.
Optimised energy and heat conservation.

Main Highlights

Water heater designed and manufactured to be installed in UK
“B” class ErP rating
Economy' setting on the dial to optimise comfort and energy saving
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

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

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Why We Love It

Smart control via WiFi.
Safe and reliable operation.
Energy-saving Eco functions.

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
Anti-legionella function for total peace of mind; this feature makes the ariston water heater safe and reliable
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
Electronic temperature regulation for precise control; ideal for customising your hot water heater in the kitchen, bathroom or utility room
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.

Ariston Andris Elite WiFi 15l Water Heater Over Sink 4012005 2.5kw White for Sink hot Water heaters

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Why We Love It

Smart control for convenience.
Safe and reliable functionality.
Energy saving for small spaces.

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
Anti-legionella function for total peace of mind; this feature makes the ariston water heater safe and reliable
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
Electronic temperature regulation for precise control; ideal for customising your hot water heater in the kitchen, bathroom or utility room
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.

ThermoMate ZERO16 16L Gas Water Heater, Instant Outdoor Water Heater, Tankless Propane Gas Boiler, Use for Camping Showers, Horses Washing, RV Trip,Mobile Home Vacation

15% OffFree Shipping

Why We Love It

Instant and endless hot water.
Quick installation and user-friendly.
Multiple safety protections included.

Main Highlights

【INSTANT & ENDLESS HOT WATER】- With a 16L thermomate tankless water heater, you can instantly enjoy continuous hot shower on demand anytime and anywhere. The LPG boiler will be ignited at 0.25 bar low water pressure. Fully adjustable heat and water flow via control knob.
【EASY TO SET UP & USE】 - Thermomate ZERO16 comes with all necessary accessories for quick installation and ignited by 2-D batteries, which is great to campsite, RV, stables, shower shack, off grid, etc.. Featuring a visible LED display and a smart thermostat device, you can read the real-time temperature, adjust the temperature at your preferred degree and avoid scalding.
【MULTIPLE PROTECTION CONFIGURATIONS】- Flame failure protection will cut gas supply off immediately in the event of flameout to reduce the risk of gas leakage; Overheat protection at 85℃; High water pressure protection active when over 8 bar. Anti-freezing drain plug can discharge the residual water to avoid freezing in cold areas or in case of long time no use.
【ENERGY SAVING & ECO MODE】- Compact structure with 11.5% energy saving technology. The heat exchanger and main burner of the propane water heater shower are designed with advanced combustion technology to decrease gas consumption and burning noise. Eco mode optional, segmented combustion for different heat power demands.
【PLEASE NOTE】- Please verify that this ZERO16 is the right size for your hot water needs before purchasing and installing. It runs propane gas and is for outdoor use only. The gas inlet, water inlet, and water outlet connectors are G1/2'' standard thread. If you live in a low-pressure area, you will additionally need a 12V water pump.

Speedflow Unvented Undersink Water Heater 15 liter Capacity

Why We Love It

Easy temperature control assurance.
Effortless and time-saving installation.
Flexibility in installation location.

Main Highlights

External temperature control and Neon element - on indicator
IPX4 rated
Maximum working temperature 75 degrees Centigrade
Cable pre-wired (1.5m) - saves time on installation
Units can be sited above or below or below the sink but must be installed the right way up

Water Heater Speedflow Undersink Electric 2kW Slim 15 Litre Tank SF15K by Hyco

VELPAX Gas Water Heater,Outdoor Instant Water Heater,16L Camping Water Heater with Digital Display and Multi-Protection for Indoor Shower,Kitchenette,Laundry Room,Courtyards,Outdoor Showe

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Why We Love It

Versatile for indoor and outdoor.
Enhanced safety features for protection.
Quiet operation for peaceful use.

Main Highlights

【Multi-functional water heater】-This water heater comes with, gas control centre, seasonal control centre,Water control centre and temperature display, continuous hot water supply, water and gas can be adjusted individually, suitable for indoor and outdoor, energy saving and more safety protection.
【Safer】-He has it with a variety of protection configurations, such as flame protection, overheating protection, 20-minute safety cut-off protection, which can improve the safety of the family and extend the life of the water heater.
【Product Specifications】-16L camping water heate Length: 13.4 inches, Width: 6.3 inches / 16 cm, Height: 23.2 inches / 59 cm, Capacity: 16 litres, Ignition: Automatic ignition
【ower Noise】-Outdoor Instant Water Heater has stable hot water temperature, low noise, comfortable bathing in all seasons, and the running sound is 48 decibels, which will not disturb you and your family's rest.
【WIDELY USED】- portable water heater is widely used in outdoor shower, indoor shower, kitchen, laundry room, patio and other scenarios, both outdoor and indoor, which brings great convenience to our life.

8.7

Excellent

We scanned 1909 products

We reviewed these offers relevant to the Water Heater 15l within online retailers such as Amazon, eBay and other local retailers, ensuring we covered all major brands and models. The products we selected come from trusted brands like Ariston, Hanicks, Triton Showers, thermomate, Hyco, VELPAX, all of which have a reputation for consistently delivering high-quality products that users love and innovative approaches for function & design.

For the best Water Heater 15l in the market, we considered we took a deep dive into 9546 online reviews , focusing on elements like user satisfaction, performance in real-world conditions, and long-term reliability. Our ranking also evaluates each review’s relevancy, authenticity, up-to-dateness and depth so that the comparison is more sound.

We concluded that:

The clear winner of our analysis is Ariston 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. We love many things about this product by Ariston. What sets it apart from the competition is Energy efficiency rated 'A', Eco Evo function saves money, Anti-legionella for safety.
The best value product for most shoppers and where user satisfaction is continuously the highest is Ariston Andris Lux 15L Under-Sink Unvented Electric Water Heater, 3kW 3100309 - Hanicks by Hanicks based on online reviews by bloggers, experts and online shoppers.
The biggest bargain at the moment for Water Heater 15l and the best cost-to-value ratio is ThermoMate ZERO16 16L Gas Water Heater, Instant Outdoor Water Heater, Tankless Propane Gas Boiler, Use for Camping Showers, Horses Washing, RV Trip,Mobile Home Vacationat thermomate with a 15% discount.
Our list of the best Water Heater 15l is updated regularly to reflect new releases and changes in product availability, so be sure to check back often for the latest rankings and discounts.

10 Best Water Heater 15l in The UK

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We scanned 1909 products

We concluded that: