Water heater installation and repair.
A “tankless” or on-demand water heater in most UK homes is a combi boiler, and stored hot water comes from a cylinder. Here is what we install and repair, and how to start.

Which water heater do you mean?
- On-demand (tankless) hot water: a combi boiler heats water as you use it, with no cylinder. It suits flats and smaller homes. Combi boiler prices.
- Stored hot water: a system or regular boiler with a cylinder, or an unvented cylinder, supplies several taps and showers together. Unvented cylinders.
- Electric stored hot water: a direct cylinder with immersion heaters. Cylinder and immersion heater.
- Electric boiler: heats radiators and hot water without gas. Electric boiler installation.
We do not install solar hot water or oil-fired systems, or gas fires and warm-air units. If you have a different type of stand-alone water heater, send us the make, model and photos and we will tell you whether we can help before you book.
Installation and prices
Combi boilers from £2,049 fully installed. Unvented cylinders: indirect from £1,769, direct from £1,639, fully installed. Get your price online for a boiler or a cylinder. Which system suits you depends on your household, water pressure and space, and we cover it at the free survey. See hot water systems.
Water heater repair: no hot water
If a boiler is not heating your water, book a boiler diagnostic. For a cylinder, immersion heater or pressure problem, see hot water cylinder and immersion heater, unvented cylinder repairs and immersion heater replacement.
The £92.50 covers up to 45 minutes to investigate the fault. We aim to get your boiler working during the visit where possible. The fee is for the diagnostic visit and is payable regardless of the outcome. Any further repair work is agreed separately. What happens at the visit
Information to send
- The full postcode and whether the property is a house, flat or rented.
- The make and model of the boiler, cylinder or water heater, from the data label, and a photo of it.
- What is wrong: no hot water, lukewarm water, low pressure, leaks, noise or an error code.
- Photographs and/or videos of the unit and the pipework around it, taken from a safe position. Do not open casings or touch gas or electrical connections.
Booking
Once you have paid, your booking is confirmed.
A two-hour arrival window can be confirmed on the day.