Water Heater Installation Cost
£200–£1,200electric or gas supply-and-install range. Last updated August 2026.
Electric water heaters typically cost £200–£700 supplied and installed; gas models typically cost £450–£1,200.
What each option costs
| Type | Typical cost | Notes |
|---|---|---|
| Electric water heater | £200–£700 | Supply and installation |
| Gas water heater | £450–£1,200 | Supply and installation |
What affects the price
- Gas or electric system
- Capacity and specification
- Pipework, flue, ventilation, and electrical upgrades
What’s included
- The heater, connections, labour, and disposal stated in the quote
- Testing and commissioning
Good to know
How long does it take? A straightforward replacement can be completed within a day; new services or upgrades take longer.
Do I need one? Gas models require a Gas Safe engineer; electrical and unvented-cylinder work require appropriate competence.
Before you book, read what to check before a plumber starts.
How to pay less
- Replace in the same location where suitable
- Compare quotes using the same capacity and installation scope
