Power and gas bills have crept up again for Perth households in 2026, and one of the biggest untapped opportunities for savings is often sitting quietly in the backyard or laundry: an ageing hot water system. With federal rebates for heat pump hot water systems now easier to access, and WA's climate practically tailor-made for the technology, plenty of homeowners are asking whether it's finally time to upgrade. Here's what's changed, what it could mean for your household budget, and how to tell if your current system is on borrowed time.

What's Changed With Hot Water Rebates in 2026

The federal Small-scale Technology Certificate (STC) scheme remains the main lever available to WA households looking to offset the cost of a heat pump hot water system. Every eligible installation earns STCs, which installers typically discount off the upfront price rather than requiring homeowners to trade them separately. With certificate prices sitting around $38 each in early 2026, a typical heat pump installation can attract a discount in the order of $800 to $1,200, depending on the size and model of the unit.

Unlike Victoria and New South Wales, which run generous state-based top-up rebates on hot water upgrades, WA doesn't currently offer an equivalent state scheme. That makes the federal STC discount the primary financial incentive for Perth homeowners, so it pays to get quotes from a few licensed installers to see how much of that saving is being passed on.

How Heat Pump Hot Water Systems Actually Work

A heat pump hot water system doesn't generate heat directly the way a gas burner or electric element does. Instead, it works like a reverse-cycle air conditioner running in heating mode, drawing warmth from the surrounding air and transferring it into the water stored in the tank. Because it's moving heat rather than creating it from scratch, a heat pump typically uses three to four times less electricity than a standard electric storage system to heat the same amount of water.

Why Perth's Climate Suits Heat Pump Systems So Well

Heat pumps perform best when the surrounding air is mild, which is exactly the conditions Perth offers for most of the year. Unlike the cold winters of Victoria or Tasmania, where heat pumps have to work harder to extract warmth from chilly air, Perth's long sunshine hours and moderate winter temperatures mean the outdoor unit rarely struggles. For households that already have rooftop solar, running the heat pump during daylight hours can push the effective cost of hot water close to zero.

Gas, Electric or Heat Pump: Weighing Up the Options

Gas storage and continuous flow systems remain popular in Perth for their fast recovery and lower upfront cost, but ongoing gas price rises have narrowed the running-cost gap in recent years. Standard electric storage systems are the cheapest to install but the most expensive to run, especially outside off-peak tariff windows. Heat pump systems sit at a higher upfront cost but typically offer the lowest ongoing running costs of the three, particularly for larger households with consistent hot water demand.

Signs Your Current Hot Water System Is on Its Way Out

• The system is more than 10 to 12 years old, which is around the typical lifespan for a storage tank.
• You're hearing rumbling, popping or banging noises, usually caused by sediment building up at the bottom of the tank.
• Water coming out rusty or discoloured, which can point to internal tank corrosion.
• Pooling water or damp patches around the base of the unit.
• Inconsistent water temperature or a noticeably reduced hot water supply.
• For gas systems, a pilot light that won't stay lit or keeps cutting out.

Practical Tips to Extend the Life of Any Hot Water System

• Have the sacrificial anode checked and replaced every few years to slow internal corrosion.
• Get sediment flushed out of the tank annually, particularly in areas with harder water.
• Check that the temperature and pressure relief valve is operating correctly each year.
• Insulate any exposed hot water pipes, especially those running through the roof space.
• Book an annual professional service so small issues get caught before they become a full system failure.

Making the Switch

If your system is ageing, noisy or costing more to run each quarter, it's worth getting a professional assessment before it fails outright, rather than making an emergency decision when the hot water suddenly stops. A licensed plumber can tell you whether a heat pump is a good fit for your household's hot water usage and roof space, and walk you through what rebates and running-cost savings are realistically available.

If you're weighing up your options, the team at Plumbdog Hot Water Systems Perth can assess your current setup, talk you through gas, electric and heat pump options, and handle the supply and installation from start to finish.