Heat Exchanger Replacement Cost — Furnace & Boiler (UK, 2026)
Estimated £400–£2,200 for a heat exchanger replacement in the UK, depending on the HVAC system and the exact fault. Built from 3 sourced repair jobs across 3 HVAC types — each row keeps its own sources. Reviewed July 2026.
What a heat exchanger replacement costs, by HVAC and fault Estimated
Each row is a real sourced repair job whose description matched this part. Parts and total are that job's own national range — follow the problem link to localize it to your area.
| HVAC | Problem | Repair | Parts | Total | DIY |
|---|---|---|---|---|---|
| Gas Furnace | Cracked heat exchanger replacement | Cracked heat exchanger repair (before replacement becomes the better option) | £300–£700 | £1,200–£2,200 | Pro recommended |
| Boiler | Leaking water | Heat exchanger replacement (cracked/corroded — high-ticket) | £150–£400 | £450–£750 | Pro recommended |
| Oil Furnace | Cracked heat exchanger / combustion chamber | Heat exchanger replacement on an oil-fired appliance (OFTEC-registered technician) | £180–£700 | £400–£1,500 | Pro recommended |
Base: 1 published national repair-cost guide (full source registry on the methodology page), published rates from 10 UK repair companies · National base ranges — localize any figure on its linked problem page · Reviewed July 2026 · Estimated
Related HVAC cost guides
The full cost guide for each HVAC system a heat exchanger replacement shows up in:
Estimated national ranges aggregated from the linked problem pages — no per-page localization is applied here. See the methodology for the localization method and named sources.
Reviewed by a Red Seal–certified appliance technician who also holds a Technical Safety BC gas ticket (Gas-C) and an ODS/halocarbon refrigerant ticket (CFC/HCFC/HFC).