How much does a hot water system cost in Perth?
Gas is what Perth searches for, and a gas storage unit supplied and installed costs $1,250–$3,675, with continuous flow gas at $1,575–$3,675. Electric storage is the cheapest to buy at $840–$3,150 but carries a running cost of $525–$1,250 a year. A heat pump is $3,150–$6,300 before the federal certificates and $2,625–$5,550 after them, and solar hot water $3,675–$7,350. Those are planned-replacement prices; a same-day like-for-like swap is $1,375–$4,200. Perth households average 2.6 people while 45.7% of homes have four or more bedrooms (ABS 2021 Census), which is why the sizing question matters more here than in a city of flats.
Comparing cities, or after the Australia-wide picture? See the national guide: Hot water system cost in Australia.
Detailed Pricing — Hot Water System Cost in Perth 2026
| Service | Low | Typical | High |
|---|---|---|---|
| Electric storage (supply + install) | $840installed | $1,900 | $3,150 |
| Gas storage (supply + install) | $1,250installed | $2,300 | $3,675 |
| Continuous flow gas | $1,575installed | $2,300 | $3,675 |
| Heat pump (supply + install) | $3,150installed | $4,400 | $6,300 |
| Heat pump (after rebates) | $2,625installed | $3,775 | $5,550 |
| Solar hot water | $3,675installed | $5,250 | $7,350 |
| Tempering valve install | $160per job | $260 | $420 |
| Hot water repair (general) | $160per job | $315 | $525 |
| Anode replacement | $210per job | $315 | $525 |
| Old system removal + disposal | $79per job | $135 | $210 |
| Urgent / same-day replacement (like-for-like, supplied + installed) | $1,375installed | $2,425 | $4,200 |
| Running cost (electric, annual) | $525/year | $840 | $1,250 |
| Heat pump, 250–270 L (1–3 people, supply + install, before rebates) | $3,150installed | $4,000 | $6,300 |
| Heat pump, 300–315 L (3–5 people, supply + install, before rebates) | $3,575installed | $4,725 | $7,350 |
| Hot water storage tank (electric 160–400 L or gas 135–170 L, supply only) | $945per unit | $1,475 | $2,300 |
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Get Perth quotes →Prices include GST. Based on Perth metro area, October 2026. Outer suburbs may vary.
Perth hot water costs: gas systems, replacement and repairs
Gas hot water system cost in Perth
A gas storage system costs $1,250–$3,675 installed in Perth, typically $2,300. A continuous flow gas system is $1,575–$3,675, typically $2,300. For comparison, electric storage is $840–$3,150.
Hot water system replacement cost in Perth
Removing and disposing of the old system is priced separately in our Perth table, at $79–$210. An emergency replacement is $1,375–$4,200, typically $2,425.
Hot water repairs in Perth
A general hot water repair in Perth costs $160–$525, typically $315. Replacing the anode is $210–$525 and fitting a tempering valve $160–$420.
These answers use the prices in the table on this page.
New hot water system cost in Perth (2026): electric, gas, heat pump and solar
A new hot water system in Perth costs $840–$7,350 supplied and installed, depending on the type of system. An electric storage unit is the cheapest to buy at $840–$3,150 ($1,900 typical); a heat pump or solar system costs the most up front and the least to run. The bands below are supply and installation for a like-for-like swap; removing the old unit is a separate line.
| Job | Low | Typical | High |
|---|---|---|---|
| Electric storage (supply + install) | $840 | $1,900 | $3,150 |
| Gas storage (supply + install) | $1,250 | $2,300 | $3,675 |
| Continuous flow gas (supply + install) | $1,575 | $2,300 | $3,675 |
| Heat pump (supply + install) | $3,150 | $4,400 | $6,300 |
| Solar hot water (supply + install) | $3,675 | $5,250 | $7,350 |
| Old system removal + disposal | $79 | $135 | $210 |
Gas hot water system prices in Perth: a gas storage unit is $1,250–$3,675 installed ($2,300 typical) and continuous flow gas $1,575–$3,675. Gas hot water installation in Perth is a like-for-like swap when the gas line and flue are already there; running a new gas line or moving the unit outside is quoted on top. Continuous flow costs more to buy and never runs out of hot water.
What moves a new-system quote within its band:
- Like-for-like or a changeover: replacing electric with electric is the simplest job; switching to gas, heat pump or solar adds plumbing, electrical or roof work.
- Tank size: a larger tank for a bigger household costs more than a compact unit.
- Access: a unit in a tight cupboard, on a roof or up stairs takes longer to swap than one at ground level outside.
- Valves and compliance: a tempering valve, pressure-relief valve or a new isolation tap are quoted separately when the old ones cannot be reused.
- Rebates: federal certificates and the Western Australian scheme apply to eligible heat pump and solar systems and change over time; ask for the quote with the current rebates taken off.
Not sure which type? The sections above compare running costs and lifespans for Perth homes.
What Affects Hot Water System Costs in Perth
Gas storage or continuous flow
The two gas options land in the same band, $1,250–$3,675 for a storage tank and $1,575–$3,675 for an instantaneous unit on the wall. Storage is simpler to swap like for like; continuous flow never runs out but may need a larger gas line and a power point for its ignition. In Western Australia all gasfitting must be done by the holder of a Building and Energy gasfitting licence, so the gas connection is never a handyman line on the quote.
Sizing for a four-bedroom house
Nearly half of Perth homes have four or more bedrooms (45.7%, ABS 2021 Census) while the average household is 2.6 people, so a tank sized to the house can be bigger than the people in it need. For a heat pump the table separates the sizes: $3,150–$6,300 for one to three people and $3,575–$7,350 for three to five. Count the people, not the bedrooms, and ask for the smaller unit if it fits.
The federal certificates
The discount worth chasing in Perth is federal: under the Small-scale Renewable Energy Scheme an eligible heat pump or solar water heater earns small-scale technology certificates, deemed over the system's ten-year life, and the installer normally takes their value off the price. Perth postcodes sit in the Clean Energy Regulator's zone 3 for both heat pumps and solar water heaters. That discount is the gap between $3,150–$6,300 and $2,625–$5,550 in our table.
Dry summers and a mild winter
Perth is NCC climate zone 5, warm temperate: February days average 31.7 °C, December brings only 9.6 mm of rain, and even July, the wettest month at 147.0 mm, has nights around 8.1 °C (BOM averages). That is kind weather for solar hot water ($3,675–$7,350) and for a heat pump, which draws heat from the air and works hardest in cold that Perth rarely sees. Site either unit out of shade.
Licensed plumbers and the 50 °C valve
Only a plumber licensed by the Plumbers Licensing Board can do water supply plumbing in Western Australia, and Building and Energy's online licence search will confirm the name on the van. The National Construction Code caps hot water at bathroom outlets at 50 °C for new installations, so a tempering valve at $160–$420 goes on the quote if the old system had none. Removing and disposing of the old tank is $79–$210.
Repair, anode or replace
A general repair call is $160–$525, and a new sacrificial anode, the rod that corrodes so the tank does not, is $210–$525. Where the tank itself is weeping, repair money is wasted: a supply-only replacement tank is $945–$2,300 before fitting. Waiting until it fails costs the urgent premium, $1,375–$4,200 against a planned $2,300.
How to Save Money on Hot Water System Cost in Perth
Frequently Asked Questions — Hot Water System Cost in Perth
Our Methodology
These are independent estimates from public cost guides, marketplaces and industry rate data, and no tradesperson can influence them, so always get a few quotes. Last reviewed October 2026. Read our full methodology →