Heat Exchanger Replacement Cost — Furnace & Boiler (Australia, 2026)
Estimated $400–$4,200 AUD for a heat exchanger replacement in Australia, depending on the HVAC system and the exact fault. Built from 6 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 | Heat exchanger replacement on a supported unit | $700–$1,600 AUD | $1,200–$2,800 AUD | Pro recommended |
| Boiler | No hot water | Plate heat exchanger descale or replacement (scaled domestic-hot-water side) | $250–$700 AUD | $650–$1,400 AUD | Pro recommended |
| Boiler | Leaking water | Failed heat exchanger or corroded boiler body — exchanger replacement, or the repair-versus-replace decision | $900–$2,600 AUD | $1,600–$4,200 AUD | Pro recommended |
| Boiler | Kettling (banging / rumbling noise) | Heat exchanger descale and burner clean during a full boiler service | $40–$180 AUD | $400–$900 AUD | Pro recommended |
| Oil Furnace | Not heating / no heat | Heat exchanger replacement where the exchanger has cracked or failed | $700–$1,900 AUD | $1,200–$2,800 AUD | Pro recommended |
| Oil Furnace | Cracked heat exchanger / combustion chamber | Heat exchanger replacement on a ducted warm-air heater | $600–$1,800 AUD | $1,200–$2,800 AUD | Pro recommended |
Base: published rates from 37 Australian 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).