A hot water system rarely fails at a convenient time. When replacement is the right call, the priorities are simple: get the right system for your home, get it installed properly and compliantly, and get your hot water back today — without invoice surprises.
Signs it's time to replace, not repair
- The system is 10+ years old — most storage systems last 8–12 years in Perth conditions
- Water pooling around the tank — cylinder corrosion is not repairable
- Rusty or discoloured hot water — the tank is corroding from the inside
- Rumbling, banging or popping — heavy sediment buildup from Perth's mineral-rich water
- Second major repair in a short period — the costs compound quickly
- Rising energy bills — an ageing system can cost hundreds more per year to run than a modern one
Not sure? We'll assess it and quote both options where a repair is genuinely viable. See hot water repairs.
How replacement works — step by step
- 1. Assessment & sizing. We check your existing system, household size and usage, gas availability and location — then recommend the right capacity and type, with a fixed written price.
- 2. You approve the quote. Everything is included: supply, installation, valves, compliance items, old unit removal and disposal.
- 3. Safe disconnection & removal. The old system is isolated, drained, disconnected and taken away — you never see it again.
- 4. Installation & compliance. New system installed with a tempering valve (required by WA regulations on new installs), pressure limiting and all required fittings.
- 5. Testing & handover. Temperature, pressure and safety checks, then we walk you through the system and simple care tips. Most like-for-like replacements take 2–3 hours.
Like-for-like, or upgrade?
A like-for-like swap is the fastest, cheapest path back to hot water. But replacement time is also the smartest time to upgrade — the labour is largely the same either way:
- Electric → gas continuous flow: endless hot water and lower running costs where mains gas is available. Popular in established northern suburbs. Gas systems →
- Electric → heat pump: up to 70% less electricity, with WA rebates cutting the upfront gap. Ideal for the many newer estates without gas. Heat pumps & rebates →
- Staying electric? Off-peak tariffs and correct sizing still make a real difference. Electric systems →
What does replacement cost?
Most like-for-like replacements in Perth land between $1,000 and $2,500 fully installed; upgrades to heat pump or solar run higher before rebates. Full breakdowns by type and brand: 2026 Perth hot water system cost guide.
Frequently asked questions
How long does a replacement take?
Most standard replacements take 2–3 hours onsite, including removal of the old unit, installation, testing and compliance checks.
When should I replace instead of repair?
Over 10 years old, tank leaking, rusty water, or repeated repairs — replace. Younger system with a single failed component — repair usually makes sense.
Do I need a tempering valve in WA?
Yes — WA regulations require tempering valves on new hot water installations to prevent scalding. It's included in every installation we do.
Can I switch from electric to gas or heat pump?
Yes — it involves some extra work (gas connection or electrical/siting changes), and we quote the complete changeover upfront.