New Boiler Leicester: Installation by Gas Safe Fitters

About three in four Leicester households heat with mains gas only, so a like-for-like boiler swap is the most common heating job in the city. The decisions that matter are the type of boiler, the flue route and how to protect it from hard water.

National price ranges for Leicester homeowners to check against are in our new boiler cost guide. Get at least two written quotes and make sure each one lists the same work.

Leicester at a glance

Water hardness: Hard. Severn Trent's results for August 2025 to July 2026 rate both city supply zones as hard: about 207 mg/l as calcium carbonate in the Leicester City zone and about 225 mg/l in the Victoria Park zone. Source
Age of homes: 26% of homes in Leicester were built before 1919, and 20% before 1900, according to the Valuation Office Agency's March 2024 count. Source
House types: 29.2% of Leicester households live in a terraced house, 36.4% in a semi, 11.4% in a detached house and about 23% in a flat or maisonette. Source
How homes are heated: 74.0% of Leicester households heat with mains gas only and 11.0% with electricity only. 1.9% are on a communal or district heat network and 1.9% have no central heating. Only 49 households use oil alone. Source
Energy ratings: About 57% of homes with an EPC in Leicester are rated band D or below (median score 67, band D), against 47% across England. Based on certificates lodged in the 10 years to March 2025. Source

Combi, system or regular

A combi suits most two- and three-bed terraces with one bathroom. It heats water on demand and frees up the airing cupboard.

A larger semi with two bathrooms, or a family that runs a bath and a shower at once, usually does better with a system boiler and an unvented cylinder. Keeping a cylinder also leaves the door open to a heat pump later.

Protecting it from scale

Severn Trent rates both Leicester city supply zones as hard. Ask every installer what scale protection they will fit on the cold feed and whether the boiler maker requires one for the warranty. A quote that leaves it out is not comparable with one that includes it.

Fit a magnetic filter on the return pipe as well. In older houses it catches the iron sludge that the first weeks of flow will stir up from old radiators.

What the quote should include

Expect a power flush or chemical clean, the filter, new controls, the flue kit and Building Regulations notification through Gas Safe. The installer should also tell you the boiler's output in kW and why it suits your home's heat loss rather than just matching the old one.

Fitting a boiler in Leicester homes

Red-brick Victorian terraces

With 29.2% of households in terraces, rear flues are common, but a narrow passage next door may limit where the terminal can go. A plume kit can steer the vapour away from a neighbour's window.

Interwar and postwar semis

Moving from a regular boiler with tanks in the loft to a combi frees space, but check the mains flow first. A weak supply makes a combi feel slow.

Estates built from the 1990s onwards

These usually have short flue runs and modern pipework, so swaps are quick. Check whether the original boiler was undersized for a loft conversion or extension added since.

Areas covered

Engineers who cover Leicester work across areas including Clarendon Park, Stoneygate, Knighton, Belgrave, Evington, Aylestone, Braunstone, Oadby, Wigston and Birstall.

View Leicester on Google Maps

Questions people in Leicester ask

Should I get a heat pump quote as well?

If you have outdoor space and plan to stay, yes. The Boiler Upgrade Scheme pays £7,500 towards an air source heat pump, which can close much of the price gap. See our air source heat pumps guide.

Sources

Also nearby: Boiler installation in Nottingham, Boiler installation in Coventry, Boiler installation in Northampton, Boiler installation in Derby

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