Solar Hot Water Systems Perth: A 2025 Guide

Perth's 3,000+ hours of sunshine per year makes it one of the best cities in Australia for solar hot water. Your hot water system accounts for roughly 25–30% of household energy use — a solar upgrade pays off quickly here.

Solar Hot Water vs. Heat Pump

Solar hot water (evacuated tube or flat plate): Uses the sun directly to heat water in a roof-mounted collector. Extremely efficient in Perth's climate. Requires a suitable north-facing roof section. Uses a gas or electric booster for cloudy days. Lifespan: 15–20 years.
Heat pump hot water: Works like a reverse-cycle air conditioner, extracting heat from the air. No roof collectors needed — great for homes without suitable roofs. Runs on electricity, very efficient. Can be paired with solar PV to run near-free.

Rebates Available in Perth

Both systems are eligible for Small-scale Technology Certificates (STCs) under the federal government scheme, which reduce upfront costs by $600–$2,000 depending on the system size and your postcode. The WA government has also run targeted rebate programs — check the current status with your installer or the Clean Energy Regulator website.

Costs in Perth (2025)

Solar hot water system (supply & install): $3,000–$5,500 after STCs. Heat pump system: $2,500–$4,500 after STCs. Payback period: 4–8 years depending on current energy bills, usage, and tariff.