Hot Water System Prices

A hot water system replacement in Australia costs $800–$5,000+ depending on the type. Electric storage systems start at $800–$2,000 installed. Gas continuous flow systems cost $1,500–$2,500. Heat pump systems cost $3,000–$5,000 and solar hot water $2,800–$5,500. All prices include GST and a licensed plumber.

Electric storage hot water is the cheapest option to purchase and install, starting from around $800 for a 50L unit fully installed. However, electric storage has the highest ongoing running costs. If you are comparing total 10-year costs, a heat pump or gas continuous flow system often works out cheaper overall despite higher upfront pricing.

A heat pump hot water system costs $3,000–$5,000 fully installed in Australia, with most quality brands sitting in the $3,500–$4,500 range. STC rebates under Australia's renewable energy scheme typically reduce the purchase price by $400–$1,000 depending on your location and climate zone. Most installers quote the rebate-inclusive price upfront.

Electric storage hot water systems typically last 8–12 years. Gas continuous flow systems last 15–20 years with regular servicing. Heat pump systems last 10–15 years. Solar hot water systems can last 15–25 years with panel and collector maintenance. Replacing the anode rod every 5 years significantly extends the life of any storage system.

Heat pump hot water systems are worth the extra upfront cost for most Australian homeowners. They use 60–75% less electricity than standard electric storage systems, saving $400–$700 per year in running costs for an average household. The additional cost vs electric storage typically pays back in 4–7 years, after which savings continue for the life of the system.

Yes. A tempering valve is required by Australian Standard AS 3500.4 on all new hot water installations in domestic dwellings. It blends cold water with the hot storage water to deliver a safe maximum temperature of 50°C at the tap, preventing scalding. Most plumbers include this in their installation quote — confirm it is listed before accepting any proposal.

Gas continuous flow is the most popular choice for Australian apartments because there is no tank taking up space, it provides unlimited hot water, and efficiency is good compared to electric storage. In apartments without gas connection, a compact heat pump or electric storage unit is the standard alternative. Solar hot water is generally not viable in apartments due to shared roof access.

Yes. Both solar hot water and heat pump hot water systems qualify for Small-scale Technology Certificates (STCs) under Australia's Small-scale Renewable Energy Scheme. The rebate value depends on the unit's rated output and your climate zone (1–5, where 1 is warmest). STCs are usually assigned to the installer as a point-of-sale discount — the quoted price should already reflect this.

A like-for-like replacement of an electric storage hot water system typically takes 2–4 hours. Gas continuous flow replacements take 3–5 hours including gas connections and testing. Heat pump installations take 4–6 hours. Solar hot water installations can take a full day or more if roof mounting is involved.

The most common signs are: inconsistent water temperature or running out of hot water faster than usual, visible rust or water stains around the tank base, rumbling or popping noises during heating, and frequent relief valve discharge. If your storage system is over 10 years old or your gas continuous flow unit is over 15 years old, planning a proactive replacement avoids emergency pricing.

Switching from gas to a heat pump makes financial sense for most Australian households. Heat pumps use 60–75% less energy than electric storage and are cheaper to run than gas continuous flow. STC rebates of $400–$1,000 reduce the upfront cost. The switch is most worthwhile if your gas unit is due for replacement anyway, as you avoid the sunk cost of a new gas connection or flue compliance work.