Choosing between heat pump systems and solar options is one of the most common decisions when upgrading to an efficient hot water system in Perth.
Heat pump systems extract heat from ambient air to heat water and work day and night, rain or shine, with lower installation costs and consistent year-round performance.
Solar water heaters use solar collector panels to capture free solar energy directly, offering very low operating costs wherever the sun is reliable.
And if you already have rooftop solar panels, or plan to install them, a heat pump running on excess solar electricity is often the most cost-effective long-term solution of all.
The Case for Solar Hot Water in Perth
Perth’s position as Australia’s sunniest capital city makes it one of the best places in the world to run a solar hot water system. During a good Perth summer, solar collector panels can supply almost all your hot water from free solar energy, meaning very low energy bills for months at a time.
Solar hot water suits homes with adequate north-facing roof space that receive enough solar energy throughout the day. The solar collectors are built for longevity, typically lasting 15 to 20 years or more with regular servicing.
Both the system and installation are eligible for Small-scale Technology Certificates (STCs) that reduce upfront costs.
Solar Hot Water Works Well if You:
- Have a north-facing roof with good access to solar energy and minimal shading
- Want the lowest possible running costs driven purely by solar power
- Are not currently planning to add a solar PV system to your home
- Are you replacing an existing solar hot water system with a like-for-like upgrade
The Trade-Offs to be Aware of:
- Higher upfront installation cost than a heat pump
- North-facing roof space with the right orientation is essential
- An electric element booster is needed during cold temperatures or extended cloudy periods
- More maintenance touchpoints over the system’s lifespan compared to a heat pump
The Case for a Heat Pump Hot Water System
Heat pump hot water systems are not weather-dependent and deliver strong energy efficiency year-round. By extracting heat from ambient air and operating reliably down to -7°C, they deliver consistent hot water every day of the year, regardless of cloud cover or cold temperatures.
Solar Repairs installs Eurosun heat pumps, which run at 350% efficiency (COP 4.15) and operate as quietly as 43dB (roughly the same as a household fridge).
No heavy roof panels are required. The outdoor unit sits at ground level on a concrete pad, so there is no structural roof load to factor in.
Heat pump units connect to normal household electricity wiring and can be timed to operate during the day, drawing on electricity generated by your existing solar PV system rather than the grid.
This flexibility is what makes them such a compelling choice for Perth homes already running rooftop solar panels.
A Heat Pump is a Strong Choice if You:
- Have or plan to install a rooftop solar system generating excess solar electricity
- Have limited roof space or panels already occupying your best north-facing sections
- Are replacing an older electric hot water system and want a straightforward upgrade
- Want lower installation complexity and access to the strongest available government rebates
- Prefer a low-maintenance system with a 6-year warranty
The Trade-Offs to Consider:
- Requires adequate airflow around the outdoor unit
- Some fan noise during operation, though modern units are significantly quieter than older models
- Running costs are marginally higher than solar hot water when not paired with a solar PV system
Head-to-Head Comparison
| Factor | Heat Pump | Solar Water Heater |
| Upfront cost | Lower ($3,000–$5,000) | Higher ($4,000–$7,000+) |
| Running costs | Low | Very low in sunny conditions |
| Works at night? | Yes | No (relies on stored heat) |
| Works in cloudy weather? | Yes, full efficiency | Reduced (booster kicks in) |
| Roof space needed? | No | Yes, north-facing preferred |
| Lifespan | 10–15 years | 15–20+ years (collectors) |
| Government rebates (STCs) | Yes, often higher | Yes |
In Perth, where the sun shines more than any other Australian capital city, both systems perform well. The right choice still comes down to your roof, your household size, and your existing setup.
Heat Pump + Rooftop Solar PV
If you already have a rooftop solar system, or are planning to install one, a heat pump hot water system is almost always the smarter choice.
Program your heat pump to run during peak solar generation hours, and it draws on excess solar electricity generated by your rooftop panels rather than pulling from the grid. For most Perth households with a 5kW or larger solar PV system, that can mean hot water that costs almost nothing to run across the entire year.
The combination of solar photovoltaic panels and a heat pump water heater is the most efficient hot water system available for Perth homes today.
Solar Repairs installs both systems and can assess your existing setup to find the right combination.
Which Hot Water System Is Right for You?
Choose a Solar Hot Water System if:
- Your roof has good north-facing space with minimal shading and no existing solar PV panels
- You want to maximise the use of direct, free solar energy for water heating
- You are replacing an existing solar hot water system and want to retain the same approach
- Long-term, low-cost operation from solar energy alone is your primary goal
Choose a Heat Pump if:
- You have or are planning to install rooftop solar panels to generate excess solar electricity
- Your roof space is already occupied, limited, or partially shaded
- You want a straightforward upgrade from your existing electric hot water system
- You are after the highest available government rebates and a low-maintenance system
Our technicians provide an honest recommendation based on your actual setup, with no pressure toward one product over another.
Need Further Help Deciding? Contact Solar Repairs Today!
Whether you are drawn to the free solar energy of a rooftop solar hot water system or the year-round reliability of a heat pump, both are a significant step up from a standard electric or gas water heater.
For Perth homes already running solar PV panels, pairing them with a heat pump is often the most cost-effective solution available.
For homes with a clear north-facing roof and no existing solar setup, solar hot water remains a strong long-term investment.
Solar Repairs installs and services both systems across Perth and WA. Call us on 1300 555 274 to get in touch today.
