The ranges
These are the figures published on this site. They are ranges because that is what is honest — a quote depends on the property, not just the appliance.
| Item | Typical range | What sits at each end |
|---|---|---|
| New system supplied and installed | $875 – $7,000+ | Low: small electric storage, straight swap. High: large heat pump or solar with extra work |
| Solar hot water system installed | $3,100 – $5,200 | Varies with collector type, tank size, boosting method and roof access |
| Repair call-out and labour | $140 – $400+ | Low: a thermocouple or a relief valve. High: diagnostic work or awkward access |
| Replacement parts | $30 – $50 | Elements, thermostats, thermocouples, valve components |
Installation itself typically takes two to three hours for a like-for-like replacement, which is the part of the job most people can picture. Everything below is what makes it longer.
What moves the number
Access. A unit in an open side passage is a different job to one in a roof space, on a first-floor balcony, or behind a fence with no gate wide enough to carry a cylinder through.
The base or bracket. Old steel stands rust from the bottom. A new tank does not go onto a failed stand, so that gets replaced first.
Compliance catch-up. A tempering valve where the old unit had none. A relief valve drain line that currently discharges somewhere it should not. A gas flue termination that is no longer acceptable. Common on units installed decades ago and not optional.
Fuel changeover. Electric to gas means a licensed gas fitter running a new gas point. Gas or electric to heat pump means a suitable electrical circuit and clear air around the unit. Both are a day rather than a morning.
Relocation. New water lines and often a new gas or electrical run. It costs more now and frequently pays back by getting the unit out of the weather and closer to the bathrooms.
Removal. Draining and carting away the old cylinder. Normally included in a quoted changeover, but worth confirming.
Running cost is the bigger number
Over a decade, what the system costs to run usually dwarfs what it cost to buy. Broadly, from cheapest to dearest to operate: solar with an efficient booster, heat pump, gas continuous flow, gas storage, electric storage on a controlled tariff, electric storage on a standard tariff.
That ordering is why the first question is whether the property has mains gas. On a connected street, gas beats resistance electricity comfortably. On a street with no gas, the comparison is heat pump against electric tank, and the heat pump wins over ten years at roughly a third of the electricity for the same hot water.
Solar PV changes this. A household with a decent rooftop array that can heat water during the day shifts the economics of both electric storage and heat pumps considerably.
Repair or replace
A rough rule that holds up: under about eight years, repair the part. Over about twelve, put the repair money toward a replacement. Between the two, it depends what failed.
An element or thermostat is a cheap part on a sound tank. A cylinder weeping from the shell is not repairable at any price — the steel has corroded through and no patch is legitimate. See hot water repairs for which faults fall where.
Perth's hard water pushes storage cylinders toward the shorter end of their expected life, which shifts the arithmetic slightly earlier than it would be in a soft-water city.
Before you accept a quote
Ask what is included: the unit, the installation, the tempering valve, the removal of the old one, and the compliance paperwork. Ask whether the price changes if the base needs replacing. Ask what the warranty covers and what voids it.
Then read the installation page so you know what you are buying, and the hot water systems overview if you are still choosing a type. If the old unit has already failed, emergency replacement covers doing this under time pressure.
Frequently asked questions
How much does it cost to install a new hot water system in Perth?
The figure published on this site is a range of roughly $875 to $7,000 or more for supply and installation, depending on the system type and what the job involves. The bottom of that range is a small electric storage unit swapped like for like. The top is a large heat pump or a solar system with significant additional work.
What do hot water repairs cost?
The range published on this site is roughly $140 to $400 or more for a repair, with replacement parts adding around $30 to $50. That covers the common items — elements, thermostats, thermocouples, relief and tempering valves. It does not cover anything where the cylinder itself has failed, because that is a replacement rather than a repair.
Why do quotes for the same unit vary so much?
Because most of the price is not the appliance. Access, whether the base or bracket needs replacing, whether a tempering valve or a compliant relief drain has to be added, whether the gas line needs upsizing, whether the electrical circuit is suitable, and how far the unit has to be carried all move the number before anyone touches the box.
Is a heat pump worth the extra money?
On a property with no mains gas, usually yes over a ten year horizon, because it uses roughly a third of the electricity of a resistance element. On a property with mains gas already connected and a working gas unit, the case is weaker. The right comparison is total cost over the system's life, not the purchase price.