Hot water prices in Perth at a glance
No government body publishes a price list for hot water systems in Perth. The figures below are our own 2026 planning ranges in Australian dollars for a typical home, installed, based on the kinds of jobs that get quoted around the metro. Use them to set a budget and sense-check a quote. They are not quotes: every price depends on the unit chosen and the site, and the real figure comes from a contractor who has seen the installation or good photos of it.
| System (typical home) | What usually suits | 2026 guide, installed (AUD) |
|---|---|---|
| Electric storage, like-for-like | Smaller households, unit swap in the same spot | $1,500 to $3,000 |
| Gas storage, like-for-like | Families wanting fast recovery, existing gas line | $2,000 to $3,800 |
| Gas continuous flow | Homes with gas, two or more bathrooms | $2,200 to $4,500 |
| Heat pump (after certificate discount) | Replacing an electric tank, most households | $3,000 to $6,000 |
| Solar with booster (after certificate discount) | Unshaded north-facing roof, long-term owners | $4,500 to $8,500 |
Repairs are a different kind of cost. A typical repair visit for a part such as an element, thermostat, thermocouple or relief valve commonly lands somewhere between about $200 and $700, depending on the part, the time it takes to diagnose and whether a call-out fee applies. That range is also a guide only; an on-site quote is needed.
What pushes a price up or down
Changing system type. Swapping like-for-like reuses existing connections. Changing fuel or system type often adds gas capping, an electrical circuit, a new base or a different position.
Capacity and flow rate. A bigger tank or a higher-rated continuous flow unit costs more. Getting the size right matters more than getting the cheapest unit.
Access. An external tank on a side wall with a clear path is quick. A unit in a roof space, a tight cupboard, upstairs or behind built-in joinery takes longer, and solar collectors on a two-storey roof need safe-access equipment.
Tempering and valves. A tempering valve is required on many installations; old isolation, non-return and relief valves are often replaced at the same time.
Older homes. In older Perth homes, corroded copper or galvanised fittings near the old unit, or a crumbling base, can add to the job.
Timing. Urgent or out-of-hours work may cost more than a booked job.
Disposal. Removing and disposing of the old unit should be on the quote. Ask if it is not.
Running costs matter as much as purchase price
An electric storage tank is usually the cheapest to buy and among the dearest to run. A heat pump or solar system costs more upfront but uses much less bought energy in Perth's climate. Gas sits between, depending on your tariff. When comparing, ask the contractor or supplier to show the running-cost assumptions: household size, daily hot water use, and the electricity or gas rate used. Synergy supplies electricity to most Perth households, and your bill shows the rate you actually pay.
How to compare two quotes fairly
Line them up and check each one names:
- the brand, model and capacity or flow rate
- the fuel, and whether natural gas or LPG
- whether a tempering valve is included
- any new valves, base, flue or pipework
- electrical or gas work, listed separately
- removal and disposal of the old unit
- the certificate discount on heat pumps and solar, as its own line
- compliance paperwork for plumbing, gas and electrical work
- the manufacturer warranty and the contractor's own workmanship warranty.
If one quote is much lower than the rest, it is usually missing one of those lines, or it is for a smaller or lower-grade unit.
Getting a firm price quickly
For a straightforward replacement, a contractor can often price from photos: the whole unit, the compliance or data plate, the connections at the bottom and the space around it. For a change of system, a visit is usually needed. Call 08 7830 0936, or use one of the local lines for Bibra Lake, Merriwa or Wangara. Quotes are free.
Questions people ask before they commit
Why do two hot water quotes differ so much?
Usually because they are not for the same job. One may include a tempering valve, new valves, removal of the old unit and electrical work, while the other leaves them out or uses a smaller or cheaper unit. Put the quotes side by side, line by line, before comparing totals.
Is the small-scale technology certificate discount already in the price?
For heat pumps and solar, installers usually take the certificate value off the price, but not always, and the value changes with the market and the system. Ask whether the figure is before or after the discount, and ask for the discount as its own line.
Does replacing a gas unit with an electric heat pump cost more?
Usually, because there is more work: capping the gas line, possibly a new electrical circuit, and a different position for the unit. Against that, a heat pump costs less to run than most alternatives, and if it lets you close a gas account you save the daily supply charge.
Are repairs charged by the hour?
It varies. Some contractors charge a call-out or inspection fee plus parts and labour; others quote a fixed price once they know the fault. Ask how it works before the visit.
Is there a WA government rebate for hot water systems?
Programs change, so check current information from the WA Government and your energy retailer before you buy. The federal small-scale technology certificate scheme, run by the Clean Energy Regulator, is the main ongoing incentive for heat pumps and solar systems.