Average Cost of a New Boiler in Gloucestershire (2026)

Boiler prices have steadied in 2026 after a volatile couple of years. Here's what we're seeing across Gloucester, Cheltenham and the surrounding villages.

Typical installed prices

• Combi swap (like-for-like): £2,100 – £3,200
• System boiler upgrade: £2,800 – £4,000
• Full heat-only conversion: £3,500 – £5,500

What pushes the price up

Moving the flue, upgrading pipework to 22mm, or adding a magnetic filter and smart thermostat will typically add £300–£700.

When to replace vs repair

If your boiler is over 12 years old and needs a repair costing more than a third of a replacement, replacement usually wins on efficiency alone.