Combi swaps run from £1,999 to £2,899 fitted depending on the model, and cylinder-to-combi conversions start at £2,699. Every figure includes the boiler, flue, wireless thermostat, magnetic filter, system cleanse and a registered manufacturer warranty of 5 to 10 years.
The full price list
| Job | Warranty | Fitted price |
|---|---|---|
| Baxi / Main Eco Compact — combi swap | 5 yr | £1,999 |
| Worcester Greenstar 1000 — combi swap | 5 yr | £1,999 |
| Baxi 600 — combi swap | 7 yr | £2,199 |
| Worcester Greenstar 4000 — combi swap | 10 yr | £2,699 |
| Vaillant ecoTEC plus — combi swap | 10 yr | £2,699 |
| Worcester Greenstar 8000 — combi swap | 10 yr | £2,899 |
| Conversion to combi (from system or open vent) | — | from £2,699 |
Every price includes the boiler, horizontal flue, wireless thermostat, magnetic filter, system cleanse and inhibitor, Building Regulations notification, and removal of the old boiler. Same-position swaps. Estimates confirmed after a free survey.
What every price includes
Every installation we quote is a complete job, not a boiler on a wall.
- The boiler itself, sized to your radiator count
- A horizontal flue
- A wireless room thermostat
- A magnetic system filter
- Chemical cleanse and long-term inhibitor
- All fittings
- Building Regulations notification to your local authority
- Compliance certificate posted to you
- Manufacturer warranty registered in your name
- Old boiler and packaging taken away
What is not included
We would rather flag these now than surprise you on the day. A gas supply pipe that is undersized for the new boiler's output, a flue that has to be re-routed, a fused spur that needs moving, a system so heavily sludged it needs a power flush before the warranty is valid, or condensate that has to be run to a soil stack — any of these add cost. A free survey catches all of them before you commit.
None of these appear on a quote as a surprise — if the survey finds one, it goes into the written figure before you decide anything.
Why the prices are fixed
The survey is what makes a fixed price possible: fifteen minutes looking at the gas supply, radiator count, flue route and water pressure, and the quote that follows is written, itemised, and does not move unless you change the scope. No pressure on the day, no revised invoice afterwards.