Heat Exchanger Replacement Cost — Furnace & Boiler (New Zealand, 2026)
Estimated $650–$30,000 NZD for a heat exchanger replacement in New Zealand, depending on the HVAC system and the exact fault. Built from 4 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 | Replace the heat exchanger where the part is still supported for that model | $900–$2,600 NZD | $1,800–$4,200 NZD | Pro recommended |
| Heat Pump | Refrigerant leak repair / recharge | Indoor coil (evaporator) replacement where the leak is in the heat exchanger | $400–$900 NZD | $900–$1,800 NZD | Pro recommended |
| Oil Furnace | Not heating / no heat | Deeper repair — heat exchanger/flueway clean, failed control or circulator found during the visit | $150–$900 NZD | $650–$1,850 NZD | Pro recommended |
| Oil Furnace | Cracked heat exchanger / combustion chamber | Condemn-and-replace: unsafe oil/diesel heat source removed and a new heat source fitted (New Zealand practice — the heat exchanger is almost never replaced in isolation) | $5,800–$24,000 NZD | $7,800–$30,000 NZD | Pro recommended |
Base: published rates from 24 NZ repair companies · National base ranges — localize any figure on its linked problem page · Reviewed July 2026 · Estimated (GST-inclusive)
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).