A same-position combi swap starts at £1,999 fitted and is a one-day job. The price includes the boiler, flue, wireless thermostat, magnetic filter and a system cleanse, with the manufacturer warranty registered in your name.
What a same-position swap includes
Combi swap pricing includes the boiler, a horizontal flue, a wireless thermostat, a magnetic filter, and a full system cleanse — same-position installs, estimates confirmed after a free survey.
- 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
How the day runs
Water and gas go off in the morning. The old boiler comes out, the new one goes on, pipework is adapted where it needs to be, the system is flushed through, cleaned and dosed, and everything is back on by the evening. We set the controls, walk you through the thermostat, register the warranty and leave the paperwork.
Swap prices
| 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.
Costs that are not in the headline price
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.