Boiler installation

Time for a new boiler? Get one fitted in Bristol.

Replacing an old boiler, switching to a combi or moving it somewhere better. Tell us about your home and get a quote from a local installer.

Like-for-like replacements
Combi conversions
Boiler moves and new flues

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Boiler installation

What a new boiler installation involves

Every installation starts with a look at your home: the boiler you have, where it sits, how the flue leaves the building and how much hot water you use. That decides the type and size of boiler, and the price.

A wall-mounted gas boiler beside a hot water storage cylinder, joined by copper pipework.

Choosing the right boiler

A combi heats water on demand and suits most flats and smaller homes. A system boiler with a cylinder suits homes where two showers run at once. A regular boiler keeps the loft tanks and is often the easiest swap in an older house.

If you are weighing them up, combi, system and regular boilers explained sets out the differences.

Close-up of the digital display and control buttons on a gas combi boiler.

Getting the size right

Boiler size means heat output, not the size of the case. It is worked out from how much heat your home loses and, for a combi, the hot water flow you want at the taps.

An oversized boiler costs more to buy and switches on and off more often than it needs to.

An installer kneeling on a dust sheet to prepare a boiler flue section in a living space.

Keeping it in place or moving it

A like-for-like swap in the same spot is the quickest job. Moving the boiler means new gas, water and condensate pipes, a new flue route and some making good afterwards.

Say in your enquiry if anything is moving, so the quote covers it.

A man reading a boiler instruction booklet beside a wall-mounted boiler.

Fitting day and what you are left with

The old boiler comes out, the system is cleaned, and the new one is fitted, filled, tested and commissioned. What happens on boiler installation day walks through the day in order.

Gas boiler work must be done by an engineer on the Gas Safe Register, so ask to see their Gas Safe ID card before work starts.

The commissioning record
The manufacturer warranty registration
The Building Regulations notification

How it works

From enquiry to a new boiler

Three steps, and nothing is agreed until you accept the quote.

Tell us about your home
The property, the boiler you have now and anything you want to change.
Survey and quote
A local installer checks the details, recommends a boiler and prices the job.
Fitting and handover
Your new boiler is fitted, commissioned and explained to you, with its paperwork.

FAQ

Boiler installation questions

What people usually want to know before replacing a boiler.

Can't find your question? Contact us

Do I have to replace like for like?

No. Switching type is common, especially combi conversions in homes with a cylinder that is no longer needed. It adds work, such as removing the cylinder and tanks and altering the pipework, so mention it when you get in touch.

Will my radiators need changing too?

Not usually, but they get checked. A system that has run without inhibitor may need cleaning, and some radiators may be the wrong size once the boiler and controls change.

Can I get a price without a visit?

An installer can often give a guide price from photos and a good description. The firm price comes once someone has seen the gas supply, the flue route and the space.

What paperwork should I get?

The commissioning record, the manufacturer warranty registration and the Building Regulations notification for the gas work. Keep them together for future servicing.

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