When a hot water system fails, most Brisbane homeowners face the same question: replace like for like, or move to a heat pump? The answer depends on your household, your roof, your switchboard and how much you want to spend upfront versus over the next decade.
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How a conventional electric hot water system works
A standard electric storage system heats a tank of water with a resistance element, much like a large kettle. They’re simple, reliable and cheap to buy, with replacement installs commonly starting from around $1,500 to $2,500 depending on the tank size and brand. The downside is running cost: resistive heating uses a lot of electricity, and a family of four can see hot water make up a large share of the power bill.
How a heat pump hot water system works
A heat pump works like an air conditioner in reverse. It pulls heat from the surrounding air and transfers it into the water, using a compressor and refrigerant. Because it moves heat rather than creating it, it can use roughly a quarter to a third of the electricity of a conventional element system. Brisbane’s warm climate is well suited to this technology, since the air is rarely cold enough to hurt performance.
The trade-off is the upfront cost. Heat pump systems typically start from around $3,500 to $5,500 installed, and the unit needs space with free airflow around it, as it makes a low fan noise much like an outdoor air conditioning unit.
Which suits your home?
- Larger households: higher hot water use means a heat pump pays itself back faster.
- Small households or rentals: a conventional system’s lower purchase price can make more sense.
- Homes with solar: a heat pump can run during the day on your own solar generation, cutting costs further.
- Tight outdoor spaces: heat pumps need airflow and clearance, so unit placement matters.
What the electrical side involves
Hot water systems are hardwired to a dedicated circuit, and the work must be done by a licensed electrician in Queensland. If you’re replacing an old system, the existing circuit and switchboard are worth checking at the same time. Older boards with no safety switch protection are common in Brisbane homes, and a hot water changeover is a sensible moment to upgrade the switchboard if it needs it.
Some older homes also have off-peak hot water on a separate tariff and meter. Whether that suits a heat pump depends on how the unit is wired and your retailer’s tariff, so it’s worth confirming before you buy.
Repair or replace?
If your tank is leaking, replacement is the only option. If the water just isn’t getting hot, the cause is often a failed element or thermostat, which is far cheaper to fix. Systems over 10 to 12 years old are usually better replaced than repaired repeatedly. Our guide to electric hot water system repairs covers the common faults.
Sizing and placement
Tank size matters more than most people expect. A two-person household is generally well served by a smaller tank, while a family of four or five usually needs a larger one to avoid running out during the morning rush. Oversizing wastes energy keeping extra water hot, and undersizing leaves you with cold showers. On a heat pump, the compressor unit also needs a spot with good airflow, away from bedroom windows, and with a drain for condensate.
Many Brisbane homes have the old tank in a tight side passage or under the house, so it’s worth checking access before you choose. A tidy installation keeps future servicing simple and keeps the unit performing as it should.
Rebates and incentives
Government rebates and incentives for efficient hot water systems change regularly, and eligibility depends on your location and the system. Check the current Queensland and federal programs before you buy, and ask your installer which models qualify.
Getting it done properly
A good installer will assess your household’s hot water use, check the switchboard and circuit, and recommend the system that suits, rather than defaulting to the most expensive option. If you also use air conditioning heavily, it’s worth thinking about the whole electrical load. See our full range of services or contact us for a free quote and we’ll talk through your options.
Planning a new or replacement system? See our air conditioning installation page for typical prices, or our full range of air conditioning services.