A straight combi-for-combi swap in Birmingham starts at £1,999 fitted, and converting an older cylinder system to a combi starts at £2,699. Both figures include the boiler, a horizontal flue, wireless thermostat, magnetic filter, system cleanse and inhibitor, plus a 5 to 10 year manufacturer warranty registered in your name.
What you get for the price
Every installation we quote is a complete job, not a boiler on a wall. The fitted prices on this site include the appliance, a horizontal flue, a wireless room thermostat, a magnetic system filter, chemical cleanser and long-term inhibitor, all fittings, and the Building Regulations notification that goes to your local authority.
- 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
Combi swap or system conversion?
A combi swap means your new boiler goes where the old one was and the pipework is largely reused — the cheapest and quickest option, usually one day.
A conversion means moving from an older system with a hot water cylinder and a tank in the loft over to a single combi. It costs more because we remove the cylinder and tanks, re-run pipework, make good, and rebalance the whole system. Budget two days, from £2,699. For most three-bed houses across Birmingham it is the change that makes the biggest difference to running costs and loft space.
If you have two or more bathrooms and a household that showers at the same time, a combi is often the wrong answer — we will say so at the survey rather than sell you the wrong boiler.
Which boiler should you actually buy?
We install Worcester Bosch, Vaillant, Baxi and Main — those four only. There is no single best boiler — there is the right output for your radiator count and the right warranty for how long you plan to stay.
- Baxi / Main Eco Compact and Worcester Greenstar 1000 — a solid budget choice for a flat or small terrace, 5 year warranty.
- Baxi 600 — the best warranty-per-pound on our list, at 7 years.
- Worcester Greenstar 4000 and 8000 — quieter, better hot-water performance, worth it in a family home with a power shower.
- Vaillant ecoTEC plus — our pick for larger properties and for anyone who wants parts availability for years to come.
Not sure? Answer three questions and we will point you at the right row of the price list.
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.
How the job runs
- 1
Survey
We look at the gas meter and supply pipe, count radiators, check flue routes and water pressure. Around fifteen minutes, no charge.
- 2
Fixed quote
Written, itemised, and it does not move unless you change the scope.
- 3
Install day
Water and gas off in the morning, back on the same evening for a swap. A conversion or a boiler move normally takes two days.
- 4
Handover
We set the controls, run you through the thermostat, register the warranty and leave the paperwork.
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.