Cost of Boiler Installation UK — 2026 Price Guide

Combi boiler installation is typically £1,800 - £3,000 and system £2,500 - £4,000 including VAT. Call-Out Fee Applies*. Call 020 8050 9933.

Key facts

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Boiler installation typically costs £1,800–£4,000, depending on boiler type, brand and pipework changes. Gas Safe registered engineers carry out gas boiler work. Discuss the scope of installation and appliance requirements when booking.

Combi boiler installation cost

Typically £1,800 - £3,000 including VAT. Compact and efficient, and suits most homes with one bathroom. The final price depends on the boiler, flue and any pipework changes.

System boiler installation cost

Typically £2,500 - £4,000 including VAT. Best for larger homes with multiple bathrooms and higher hot-water demand.

Regular (heat-only) boilers

These keep an existing hot-water cylinder and cold-water tank, which is common in older properties. The price depends on the existing system, so ask for a quote after describing your setup.

What affects the price

Boiler brand and output (kW), moving the flue or boiler location, upgrading pipework, magnetic filter, smart thermostat, and whether a system flush is needed.

How do I arrange installation?

Call 020 8050 9933 with details of your existing boiler, property and hot-water requirements. Gas Safe registered engineers carry out gas boiler installations.

Quick tips

Related help

Common questions

How long does a boiler installation take?

A like-for-like swap is usually 1 day. Moving the boiler or changing type takes 2–3 days.

Do I need a power flush with a new boiler?

If the old system has sludge, yes — otherwise the new boiler's warranty may be voided. We test the system on the survey.

Which brand of boiler is best?

The suitable boiler depends on your home, budget and hot-water demand. Compare output, controls and manufacturer requirements.

Call 020 8050 9933