How Much Does It Cost to Replace a Hot Water System in Australia (2026)?
Quick Answer
Hot water system replacement costs $1,200–$4,500+ fully installed. Electric storage: $1,200–$2,200. Gas storage: $1,500–$3,000. Gas instantaneous: $1,800–$3,200. Heat pump: $3,000–$4,500. Solar: $3,500–$7,000.
Hot Water System Costs by Type (2026)
| Type | Unit Cost | Install Cost | Total |
|---|---|---|---|
| Electric Storage (250L) | $700–$1,200 | $500–$1,000 | $1,200–$2,200 |
| Gas Storage (170L) | $900–$1,600 | $600–$1,400 | $1,500–$3,000 |
| Gas Instantaneous (26L/min) | $1,000–$1,800 | $800–$1,400 | $1,800–$3,200 |
| Heat Pump (270L) | $2,000–$3,000 | $1,000–$1,500 | $3,000–$4,500 |
| Solar (Flat Plate + Tank) | $2,500–$4,500 | $1,000–$2,500 | $3,500–$7,000 |
What Affects the Price?
- Like-for-like vs conversion: Replacing the same type is cheapest. Converting from electric to gas or gas to heat pump adds $500–$2,000 for new pipework, flue, or electrical work
- Location: Roof-mounted vs ground-level affects labour time
- Access: Tight spaces, stairs, or long pipe runs add cost
- Disposal: Removing the old unit typically adds $100–$200
- TMV installation: Required by AS 3500.4 for bathrooms — adds $150–$300 if not already fitted
- Government rebates: Heat pumps may attract $500–$1,000 in rebates (check your state)
Compliance Requirements
Hot water system replacement is notifiable work in QLD — you must lodge a Form 7 Compliance Certificate. Gas installations also require compliance with AS/NZS 5601.1 and a gas compliance certificate.
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