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New Boiler Installation in Birmingham

A straight combi-for-combi swap in Birmingham starts at £1,999 fitted, and converting an older open-vent system to a combi starts at £2,699.

Quick answer

A straight combi-for-combi swap in Birmingham starts at £1,999 fitted, and converting an older open-vent system to a combi starts at £2,699. Both figures include the boiler, a horizontal flue, wireless thermostat, magnetic filter, system cleaner and inhibitor, plus a 5–10 year manufacturer warranty registered in your name.

New Boiler Installation in Birmingham — Synergy Gas & Plumbing, Birmingham
Boiler installation across Birmingham and the Black Country. Gas Safe registered 594385.

What you get for the price

Every installation we quote is a complete job, not a boiler on a wall. The prices below 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.

  • Gas Safe registered engineer on site for the whole install
  • Manufacturer warranty registered for you — 5 years on entry models, up to 10 years on Vaillant ecoTEC plus, Worcester Greenstar 4000 and 8000, and 7 years on the Baxi 600
  • System cleaned and dosed so the warranty stands up
  • Old boiler and packaging taken away
  • Building Regulations compliance certificate posted to you

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. 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 tell you that before you spend money, and quote a system boiler with an unvented cylinder instead.

Which boiler should you actually buy?

We install Worcester Bosch, Vaillant, Baxi and Main. 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 1000 — 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 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 guaranteed for years.

How the job runs

  1. Survey. We look at the gas meter and supply pipe, count radiators, check flue routes and water pressure. 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.
  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 survey catches all of them before you commit.

Rather we rang you?

Leave a number and a postcode. We will call you back — usually within the hour during office hours.

Prices

Baxi / Main Eco Compact combi boiler, supplied and fitted by Synergy Gas & Plumbing in Birmingham

Baxi / Main Eco Compact

5 year warranty

£1,999

Combi swap, fitted
Worcester Greenstar 1000 combi boiler, supplied and fitted by Synergy Gas & Plumbing in Birmingham

Worcester Greenstar 1000

5 year warranty

£1,999

Combi swap, fitted
Baxi 600 combi boiler, supplied and fitted by Synergy Gas & Plumbing in Birmingham

Baxi 600

7 year warranty

£2,199

Combi swap, fitted
Worcester Greenstar 4000 combi boiler, supplied and fitted by Synergy Gas & Plumbing in Birmingham

Worcester Greenstar 4000

10 year warranty

£2,699

Combi swap, fitted
Vaillant ecoTEC plus combi boiler, supplied and fitted by Synergy Gas & Plumbing in Birmingham

Vaillant ecoTEC plus

10 year warranty

£2,699

Combi swap, fitted
Worcester Greenstar 8000 combi boiler, supplied and fitted by Synergy Gas & Plumbing in Birmingham

Worcester Greenstar 8000

10 year warranty

£2,899

Combi swap, fitted
Fixed prices, updated August 2026
JobPrice
Baxi / Main Eco Compact — combi swap (5 yr warranty)£1,999
Worcester Greenstar 1000 — combi swap (5 yr warranty)£1,999
Baxi 600 — combi swap (7 yr warranty)£2,199
Worcester Greenstar 4000 — combi swap (10 yr warranty)£2,699
Vaillant ecoTEC plus — combi swap (10 yr warranty)£2,699
Worcester Greenstar 8000 — combi swap (10 yr warranty)£2,899
Conversion to combi (from system/open vent)from £2,699

Prices are estimates and may change after a site inspection. We cover Birmingham and 10 miles from B20 2JS as standard, extending to 50 miles for boiler installations. A travel charge may apply beyond 10 miles.

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Boiler installation

From £1,999 fitted
CalloutSame day where possible
OfficeMon–Fri 8–5.30
Emergency24/7
Gas Safe reg.594385

Coverage

From B20 2JS
Standard radius10 miles
Installationsup to 50 miles
TownsB'ham, Sandwell, Walsall, Dudley, Solihull
Answers

Boiler installation: common questions

How much is a new combi boiler in Birmingham?

A like-for-like combi swap starts at £1,999 fitted with a Baxi/Main Eco Compact or Worcester Greenstar 1000, and runs to £2,899 for a Worcester Greenstar 8000. Converting from an old cylinder system to a combi starts at £2,699. All prices include flue, wireless thermostat, magnetic filter and chemicals.

How long does a boiler installation take?

A straight combi swap in the same position is a one-day job. A conversion from a cylinder system, or a move to a different room, normally takes two days.

Do you install the boiler in a different room?

Yes, though it adds cost because gas, water, condensate and flue all have to be re-run. Kitchen-to-loft and kitchen-to-utility moves are the ones we do most often. We will price it at the survey.

Is my warranty valid if the system is dirty?

Manufacturers can refuse a claim if the system was not cleaned properly. That is why a magnetic filter, cleanser and inhibitor are in every one of our quotes as standard, and why we sometimes insist on a power flush first.

Do you take the old boiler away?

Yes. Removal and disposal of the old appliance and all packaging is included.

Do I need to tell the council?

We notify Building Regulations for you through Gas Safe Register and the certificate is posted to your address, usually within two weeks.

Also

Other services

Boiler playing up? We can usually get to you the same day.

Call the Birmingham office for a straight answer and a fixed price before we start work.

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