Mandurah's water, weather and homes
The estuary and canals
Mandurah's centre sits on the Mandurah Estuary, which drains the Peel Inlet and Harvey Estuary, about 134 square kilometres of water. The Dawesville Channel, opened in April 1994, lets Indian Ocean seawater flush into the Peel Inlet, and suburbs like Halls Head, Dudley Park and Wannanup are built around canals that run off it.
The ocean coast
The city also has many kilometres of sandy ocean coastline. Within 200 m of a surf beach, the GAA's corrosion guide rates the air C5, its harshest band.
Milder summers on the coast
Bureau of Meteorology figures for Mandurah average a summer maximum of 27 degrees and a winter minimum of 9. The station is on the coastline, so suburbs away from the coast can run hotter on summer days than it shows.
Mostly houses, many settled owners
Across the City of Mandurah in 2021, 83.5% of homes were separate houses and 33.6% were owned outright. In central Mandurah, 52.3% were rented and the median age was 50.
Gas is on
ATCO's gas network covers greater Perth with Mandurah included. In the ABS's 2006 survey, gas was the main heater in 46% of WA homes with heating.
Outdoor units on canal and beach blocks
Mitsubishi Electric's instructions list salty places such as the seaside among the spots to avoid, and Daikin's warranty card makes the owner responsible for extra corrosion protection in sea air. Neither says what counts as too close, so ask the installer to look at your block and say what they'd do.
On a canal block, think about which wall faces the water. A unit on the street side or a sheltered side wall may be better protected, even with a longer pipe run, so ask the installer. Have it serviced every year and ask the technician to check the coil and casing for corrosion. Our coastal homes guide covers coastal coil protection.
Don't forget heating
Mandurah's winter nights average 9 degrees on the coast, so a heater gets real use from June to August. Reverse cycle does both jobs from one system. If you're keeping a gas heater, have a licensed gasfitter service it at least every two years, the interval Energy Safe Victoria and the Better Health Channel give. See gas heater servicing in Perth, which covers Mandurah's gas network too.
What a Mandurah quote should cover
- The model's coastal or anti-corrosion protection, in writing.
- Exactly where the outdoor unit goes, and why that side of the house.
- Heating capacity as well as cooling capacity.
- The electrical contractor's EC number and the ARC details.
What we'd do
Where we'd start in Mandurah
We'd treat every Mandurah outdoor unit as a coastal one. For a canal or beachside home, that means coastal protection on the coil, the most sheltered position the installer can manage, and a service every year. We'd choose reverse cycle so the same system covers winter nights, and we'd want someone who regularly works near the water.
