Top 10 Instant Hot Water Heater UK – Water Heaters & Parts

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1. Horstmann


Multi, Horstmann Electronic 7 Water Heater

Horstmann #ad - Horstmann electronic 7 immersion Heater Controller Economy 7. For control of "off peak" type water heater installations. Automatic clock adjusts to accommodate GMT/BST summer/winter time.
BrandHorstmann #ad
ManufacturerHorstmann #ad
Part NumberElectronic 7
ModelElectronic 7

2. Stiebel Eltron


STIEBEL ELTRON instant electric hot water heater

Stiebel Eltron #ad - Energy-saving: saves up to 30% energy and water thanks to the 3i technology and electronic power control. Installation: time-saving installation thanks to professional rapid installation system and effortless replacement of all standard instantaneous water heaters.

In addition, a permanent scald protection can be set by the skilled craftsmen. The closed, pressure-resistant device can be used with all standard pressure fittings. No need to mix cold water, which leads to very good energy efficiency. Country approval: germany, Austria, Belgium, Czech Republic, Netherlands. Comfort features: both the device cap and the control unit can be rotated. High power connection either at the top or bottom. Box contents: stiebel eltron dhb-e 18/21/24 lcd, special accessories see below, mounting template, hanging bar, operating and installation instructions English language not guaranteed.

Areas of application: electric instantaneous water heater for the accurate, constant hot water supply of several removal points in the kitchen and bathroom. The temperature is infinitely and digitally adjusted via a rotary selector and displayed on the LCD display. Safety: adjustable child lock against accidental adjustment and overheating protection.
BrandStiebel Eltron #ad
ManufacturerStiebel Eltron #ad
Height11.6 cm (4.57 Inches)
Length46.6 cm (18.35 Inches)
Weight2.9 kg (6.39 Pounds)
Width22.5 cm (8.86 Inches)
Part Number236745
Warranty24 months.

3. Stiebel Eltron


20.2, White, Eco, On Demand Hot Water, Stiebel Eltron Tankless Water Heater – Tempra 24 Plus – Electric

Stiebel Eltron #ad - Our 7-year leakage and 3-Year Parts Warranties are included with purchase. Continuous flow – advanced flow control patented technology invented by Stiebel Eltron, automatically maintains water temperature for constant comfort. Tempra 24 plus – this specific model is 24kw, requires a min recommended electric service of 150 A, and offers an output water temperature of 68° to 140°F.

Has a digital temperature display and preset temperature and memory buttons, while the interior solid copper heating system does all the power work. Eco friendly unit saves energy with auto-modulation and the ability to electronically control water flow. Hot showers will never be interrupted again. Check our guides below to compare features of our various Trend and Plus models, 240V, each available in different kW levels.

It’ll reduce flow slightly if hot water demand exceeds capacity. Warranties included – stiebel eltron’s top-rated electric tankless water heaters perform with the highest standards for comfort and reliability. Easy operation – electronic switch activates the hot water heater and it’s noise free while in use. Savings monitor even shows how much you save on energy costs. Space & energy saver – its small, sleek white design saves space yet still provides endless hot water for your whole house, and no venting is required.
BrandStiebel Eltron #ad
ManufacturerStiebel Eltron #ad
Part Number239222

4. Triton Showers


465.0 mm*390.0 mm*440.0 mm, Triton TOLINSF150S Instaflow 2kW 15L Stored Water Heater, White and Stainless Steel

Triton Showers #ad - Stainless steel tank with enamel lining to prevent any corrosion build up. Two years Parts and Labour. 15 litre stored water Tank for small bathrooms and hand basins. Top temperature of 75ᵒC. Smooth temperature settings on the front of the unit for easy adjustment.
BrandTriton Showers #ad
ManufacturerTriton Showers #ad
Part NumberTOLINSF150S
Warranty2 years.



Camplux BW158BC 6L Instant Gas Water Heater with Rain Cap, Use for Outdoor Shower Camping RV Trip Horse Washing, CE Certified GAR Standard Tankless Propane Gas Boiler

CAMPLUX #ad - Led temperature display shows you the exact outlet water temperature, dogs, cats, useful for setting your shower temperature and safely giving a comfortable hot spa for your horses, etc. Ce certified gar standard - the 6l tankless water heater complies with CE certified GAR standard throughout EU market, overheat protection, which features multiple protection configurations, 20-min safety shutoff protection, such as flame failure protection, enhancing your family safety.

Energy class: A+. Weatherproof rain cap - equipped with a rain cap, it is easily installed outdoor without worries that the rain runs down inside, as well as leaves, insects and other hazards, prolonging its lifespan. The provided 37mbar ce gas regulator is compatible with any propane gas bottle with 27mm clip-on connection.

Lightweight compact design - camplux 6l gas shower comes with most of the necessary accessories to help quickly install. With 025 bar startup and ignited via 2-D cell batteries, stables, RV, trolley and other off grid areas. Endless hot water, it is great for campsite, saving energy - delivering 6l/min of endless hot water at the flick of a switch anywhere. With lightweight and compact design, it is easy to carry everywhere. Only heats the water up for actually use.
BrandCAMPLUX #ad
ManufacturerCAMPLUX #ad
Weight5.1 kg (11.24 Pounds)
Part NumberBW158BC
Warranty1 year warranty.



Use for Outdoor Shower Camping RV Trip Horse Bathing, Camplux AY132B 5L Portable Gas Water Heater with Folding Handle, Tankless LP Gas Boiler

CAMPLUX #ad - You can enjoy hot shower, give a comfortable hot spa for your horses, pets with this portable outdoor shower. Enjoy tankless & endless hot water - delivering 5 litres of endless hot water per minute within 8 seconds when the shower head is on.

Unlike the storage water heater, this tankless water heater only heats the water in amount for you need. No need to be preheated, thus eliminating the waiting time for hot water. Drain plug is applied to drain the residual water from the appliance to avoid being frozen or broken. Multiple protection - flame failure protection, overheat protection, oxygen depletion safety shutoff protection to ensure your family safety. Temperature ranges from 10~65°C.

Saving energy & money- camplux ay132 employs energy saving technology, higher temperature raise at same cost of gas. Easy to operate - you can simply adjust the water and gas flow to achieve your desired temperature. It comes with most of the necessary accessories for quick installation. Foldable handle for easy carry- this gas shower only weighs 4. 54kg, with a handle, which let you easily carry it anywhere. With 0
BrandCAMPLUX #ad
ManufacturerCAMPLUX #ad
Height37.6 cm (14.8 Inches)
Length29 cm (11.42 Inches)
Width11 cm (4.33 Inches)
Part NumberAY132B
Warranty1 year warranty.

7. Ariston


A Class Erp Rating, Ariston ANDRIS LUX ECO 10 L Oversink Electric Water Heater 2.5kW with A Titanium Enamelled Tank, Manufactured To Be Installed In UK, 3100717, Copper Heating Element

Ariston #ad - Ideal installations: Medical Environments Laboratories School Facilities. Anti-legionella function for total peace of mind: once a month, in order to eliminate the risk of legionella bacteria developing. In yhis way, user-friendly display is easy to use and provides precise electronic temperature control, you can have the hot water you need, without any effort.

Titanium enamelled tank/enhanced anti-corrosion: with its proprietary titanium tank engineering, the Andris Lux Eco boasts exceptional durability and an extended product life. 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. 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.

Water heater designed and manufactured to be installed in UK. In addition, with its robust 4 bolt flange and copper heating element, this efficient water heater offers improved protection against water corrosion. Ideal for applications such as hospitals, this mini-tank electric water heater automatically increases the water temperature up to 65°C, schools and care homes. Eco evo” function: thanks to the eco evo function, andris lux eco remembers when and how much hot water you use. Eco display: the unit’s smart, when you need it, allowing the user to set the desired temperature for every need.
BrandAriston #ad
ManufacturerAriston #ad
Height38.5 cm (15.16 Inches)
Length29.4 cm (11.57 Inches)
Width36 cm (14.17 Inches)
Part Number3100717
Warranty1 year.



Mizudo Natural Gas Tankless Water Heater 3.6 GPM, 80,000 BTU Indoor Installation Instant Hot Water heater

MIZUDO #ad - Instant hot water heatertankless water heaters can provide endless hot water on demand for 2- 3 water points. Compact designsave over 50% of available space compared to tank water heater. Premium design and durableAdopt oxygen-free copper water tank, reduce heat loss, high efficiency and durability. Quality serviceif you encounter product quality problems, you can contact us by phone, email and message, and we will provide service according to the warranty policy. Comfortable bathing experience3. 6 gpm hot water flow, precise temperature control, no water temperature sandwich.
BrandMIZUDO #ad
ManufacturerMIZUDO #ad



Camplux AY132 Tankless Propane Gas Water Heater White 5L

CAMPLUX ENJOY OUTDOOR LIFE #ad - For low water pressure areas, heater and pump assembly AY132P43, AY132Max for your choice. Drain plug is applied to drain the residual water from the appliance to avoid being frozen or broken.

Equipped with a folding handle for easy carrying whenever you go for camping tours in remote areas, RV, like campsite, stables, holiday house and other off grid areas. Heat is easy to adjust via water knob and gas knob. Instantly producing 5 litres of hot Water per minute. 37mbar for propane gas and 30mbar for butane gas. Runs on propane or butane gas cylinder. With 025 bar startup and ignited by 2pcs D-size cell batteries.
ManufacturerCamplux #ad
Height11 cm (4.33 Inches)
Length37.59 cm (14.8 Inches)
Width29.01 cm (11.42 Inches)
Part NumberAY132

10. Rheem


Rheem 18kW 240V Tankless Electric Water Heater

Rheem #ad - Flow rate- up to 4. 4 gpm. Threaded for easy replacement, simple installation, digital temperature display. External digital thermostatic control with LED display +/1 degree accuracy. Simple installation – bottom 3/4 inch NPT water connections. Durable copper immersion two heating elements, field Serviceable. Most advanced self-modulation, adjust power to meet hot water demand.
BrandRheem #ad
ManufacturerRheem #ad
Height46.36 cm (18.25 Inches)
Length36.83 cm (14.5 Inches)
Width36.83 cm (14.5 Inches)
Part NumberRTEX-18