Boiler Replacement Cost Calculator

Boiler replacement costs £1,800-£4,500 depending on boiler type. Combi boilers cost £1,800-£3,000, system boilers £2,000-£3,500, and regular boilers £2,500-£4,500. This includes the boiler unit, installation labour, and basic materials. Additional costs apply for smart controls (+£200), relocating the boiler (+£500-£1,000), or upgrading pipework. Free replacements available through ECO4 for eligible households.

Yes, free boiler replacements are available through the ECO4 scheme if you receive certain benefits (Universal Credit, Pension Credit, Child Benefit, Income Support, etc.) or have household income under £36,000 with an EPC rating of D-G. The scheme covers full installation costs with no repayment required. The new boiler must be A-rated for efficiency. Around 2 million UK households qualify.

Combi boilers are the cheapest to replace at £1,800-£3,000 including installation. They're compact (no separate hot water tank needed), quick to install (4-6 hours for like-for-like), and have lower labour costs. However, they're not always the best choice - consider your home's hot water demand. If you have multiple bathrooms used simultaneously, a system boiler (£2,000-£3,500) may be more appropriate despite higher upfront costs.

A like-for-like boiler replacement (same type, same location) takes 4-6 hours. Switching boiler types (e.g., regular to combi) takes 1-2 days due to pipework changes and tank removal. Moving the boiler to a new location adds 1-2 days. The installer will remove the old boiler, fit the new one, connect pipework and gas supply, test for leaks, commission the system, and demonstrate controls. Your home will be without heating/hot water during installation.

Yes, replacing a 15-year-old boiler typically saves £200-£400 annually on energy bills. A 15-year-old boiler runs at 70-75% efficiency versus 92%+ for modern A-rated boilers. With replacement costs of £1,800-£3,000, payback is 5-10 years. Additional benefits include improved reliability (fewer breakdowns), better heating performance, smart controls, and longer warranties (10 years vs 1-2 years for old boilers). Boilers over 15 years old are more likely to fail, causing emergency replacement costs.

A standard boiler replacement includes: removing and disposing of old boiler, supplying and fitting new A-rated boiler, connecting to existing pipework and gas supply, fitting new flue, system flushing (to remove sludge), inhibitor treatment, leak testing, commissioning and certification, 10-year warranty, and user demonstration. May NOT include: smart controls (£150-£250 extra), relocating boiler (£500+), upgrading pipework (£200-£500), or magnetic filter (£100-£200). Always request a detailed written quote.