Pool heating options compared: solar, heat pump, gas or a mix
Pool heating can turn a summer-only pool into one the family uses from spring well into autumn, and in some set-ups all year. The right choice depends on your city, your roof, where a unit can sit and how many months you actually want to swim. This guide compares solar, heat pump, gas and combined set-ups city by city, including clearance and noise. For season running costs, see our pool heating cost guide, and for the whole picture, our guide to pool running costs.
Pool heating options at a glance
Start with a pool cover, then pick the heater that matches how many months you want to swim. NSW's BASIX guidance recognises solar (on its own or boosted by gas or electricity), gas and electric heat pump pool heating, and describes solar as the most efficient way to heat a pool. Each option asks something different of your property, so compare them on what they need rather than on one headline.
| Option | How it heats | What it needs at your place | Season it suits | Main trade-off |
|---|---|---|---|---|
| Pool cover | Keeps heat in by cutting evaporation | Somewhere to store it | Stretches summer a little | Must go back on after every swim |
| Solar | Pumps pool water through roof collectors | Unshaded, ideally north-facing roof and its own pump | Around two months either side of summer | No sun, no heat |
| Heat pump | Moves heat from the air into the water | Outdoor spot with airflow clearance and a suitable power supply | Can allow year-round swimming | Output drops in cold air; some noise |
| Gas | Burns natural gas or propane | Gas supply and a licensed gasfitter | Can allow year-round swimming; quick heat on demand | Fuel use: energy.gov.au suggests gas users consider solar or a heat pump |
| Solar plus booster | Solar first, gas or heat pump tops up | Roof space plus a booster site | Solar season plus cooler months | Two systems to buy and service |
Which heating suits Brisbane, Adelaide, Melbourne and Perth
Sustainability Victoria says solar can add around two months either side of summer, while gas or heat pump heating could allow swimming all year. Read alongside the Bureau of Meteorology's climate averages below, that suggests solar can carry much of the year in Brisbane, while in Melbourne and Adelaide winter swimmers are more likely to look at a heat pump or gas, often alongside solar.
| City (BOM station) | January mean max | July mean max | July mean min | What to weigh |
|---|---|---|---|---|
| Brisbane | 30.4°C | 22.0°C | 10.6°C | Mildest winter days of the four. Solar can run a long season, and heat pumps have milder winter air to draw heat from. |
| Perth (Perth Metro) | 31.4°C | 18.5°C | 8.1°C | Hot summers and mild winter days. Solar for spring to autumn; a booster and cover for winter swims. |
| Adelaide (Kent Town) | 29.6°C | 15.4°C | 7.6°C | Cool winter days. Solar stretches spring and autumn; winter swimmers may look at a heat pump or gas. |
| Melbourne (Olympic Park) | 26.8°C | 14.5°C | 7.6°C | Coolest of the four. Sustainability Victoria puts southern Victoria's swimming season at around 3 to 4 months without help. |
These are city averages, not your backyard. Sustainability Victoria notes that wind exposure and shade also shape the season, so ask for a site check before choosing.
Solar pool heating: how it works and what it needs
For most homes, SPASA recommends solar collector area of at least 80% of your pool's surface. SPASA is the pool and spa industry association. Pool water is pumped up through rows of black tubes, called collectors, warmed by the sun and returned to the pool. SPASA also notes that the area means the collector itself, not the whole roof. Collectors should ideally sit on a north-facing roof and stay out of shade for at least six hours a day.
Most systems run on their own pump: SPASA says a typical home system needs about 100 to 200 litres per minute. Sustainability Victoria adds that a controller only sends water to the roof when the sun is strong enough to heat the pool. SPASA says solar can add up to four months of pool use; Sustainability Victoria puts it at around two months either side of summer. The limit is simple: cloudy weeks and short winter days mean little heat.
Heat pumps: how they work, clearance and noise
A heat pump moves heat rather than making it. YourHome, the Australian Government's home energy guide, explains this for household hot water: the heat pump uses electricity to move heat from the surrounding air into the water, which uses much less energy than an electric system that heats water directly. A pool heat pump works on the same idea, and the Henden Essential manual notes that in heating mode the air coming out of the unit is cooler than the air around it. The trade-off is weather: the Henden Essential pool heat pump manual says the unit's efficiency and heating capacity depend on the air temperature and humidity where it is installed. YourHome makes a similar point about hot water heat pumps, which are most efficient in relatively warm, humid climates, while noting that many are designed to run efficiently in cold climates. If you plan to swim through a Melbourne or Adelaide winter, ask how the quoted unit performs at your local winter temperatures.
Clearance
Heat pumps need fresh air moving through them. The Henden Essential manual, published by Reece, requires outdoor installation, at least 500 mm clear at the front and 300 mm at the back and sides, and recommends a site within 10 metres of the pool for optimal heating. Other models differ, so check the manual for the unit you are quoted.
Noise
The same manual warns against sites near bedrooms or living rooms, asks installers to consider neighbours, and offers a night mode about 3 dB(A) quieter. EPA Victoria says a heat pump used for heating, or a pool pump, must not be heard in a neighbour's habitable room before 7 am or after 10 pm on weekdays, or before 9 am or after 10 pm on weekends and public holidays. Outside Victoria, ask your local council which rules apply.
Gas heaters and hybrid set-ups
Gas heaters can lift water temperature quickly. One manufacturer's published guide for its smallest residential gas pool heater lists a rise of about 17°C per hour in a 2,000 litre spa, and about 21°C over 24 hours for a covered pool with 20 m² of surface. Those figures assume an outdoor heater, light wind and a cover, and the maker notes the rise is lower in stronger wind.
The trade-off is the fuel. energy.gov.au suggests households heating a pool with gas or electricity consider switching to solar or a heat pump, and to use a cover. Sustainability Victoria notes that gas or heat pump heating could allow year-round swimming.
A hybrid pairs solar with a gas or heat pump booster, which BASIX recognises as gas or electric boosted solar. The idea is that solar does the work while the sun allows and the booster steps in when it cannot keep up. You buy and service two systems, so ask for both to be priced separately.
Covers: keep the heat you already have
A pool cover is the first heating upgrade to make, whichever system you choose. Sustainability Victoria notes that covering the pool at night keeps heat in by reducing evaporation, which extends the season to some extent. The Town of East Fremantle's pool cover fact sheet says a correctly fitted cover can prevent up to 97% of evaporation and can lift water temperature by up to 8 degrees. Heat pump manuals ask for a thermal cover to minimise heat loss, and the gas heater figures above assume one is in place. energy.gov.au also reminds households heating a pool with gas or electricity to use a cover.
The catch is daily effort. A cover only works if it goes back on after each swim, so ask about a roller or storage spot that makes that easy. For options, see our pool accessories page.
Heating an above-ground or plunge pool: yes, and small pools warm faster
Above-ground and plunge pools can be heated, and their smaller surface works in their favour. The gas heater guide above shows the effect: the same heater lifts a covered 20 m² pool about 21°C over 24 hours, but a 100 m² pool only about 6°C. Solar sizing follows the same logic, because SPASA ties collector area to the pool's surface area, so a small pool needs fewer collectors and less roof.
Three things to check. First, flow: heat pump manuals list an advised water flow rate for each model, so ask the installer to match it to your pump and filter. Second, space: a heat pump still needs its clearances on a tighter block. Third, a cover that fits the pool's shape. For budgets, see our plunge pool cost guide, or browse above-ground pools in Brisbane, Adelaide, Melbourne and Perth.
Gas and electrical connection: a job for licensed trades
Hard-wiring a pool heater, adding a new circuit or outlet for one, and gas fitting are jobs for a licensed tradesperson, not a weekend project, under the regulator guidance cited here for Queensland, Victoria and Western Australia. Queensland's Electrical Safety Office says appliances that need hard-wiring must be connected by a licensed electrician. Western Australia's Building and Energy says the law requires all electrical work to be done by a person holding the relevant licence. Energy Safe Victoria says it is illegal for unlicensed people to do gasfitting or electrical work, and that homeowners must always use a licensed or registered gasfitter. In Queensland, the QBCC says anyone performing gasfitting work must hold a gasfitting licence. In Western Australia, Building and Energy says the law requires all gasfitting work to be carried out by a person holding a licence it has issued. Heat pump manuals carry the same electrical warning. In South Australia and other states, check the tradesperson's licence with your state regulator before work starts. Owner jobs stop at safe checks: reading the controller, keeping air vents clear and putting the cover on.
When pool heating is not worth it yet
Heating is not the right first spend for every household. If you only swim in the warmest months, a cover may be all you need for now. If your roof is shaded or faces the wrong way, solar may need more collector area than you have, and it is better to learn that before you buy. If a heat pump would have to sit beside a neighbour's bedroom, talk through placement and noise first.
If money is tight, heating can be staged. When planning a new inground pool, ask whether pipework and power can be allowed for now so a heater can be added later. Whatever stage you are at, the useful step is getting real numbers: an itemised quote that lists the heater, pump, plumbing, electrical or gas work and any roof work separately, so you can compare like with like before ruling heating in or out.
Frequently asked questions
How much clearance does a pool heater need?
It depends on the model, so the manual for the exact unit is the final word. As one example, the Henden Essential heat pump manual asks for at least 500 mm clear at the front and 300 mm at the back and sides, outdoors only, within 10 metres of the pool. The clearance lets the unit draw fresh air, and blocked airflow lowers efficiency. Ask your installer to show you the clearance diagram for the unit they quote.
What is the downside to heat pumps?
A heat pump draws its heat from the air, so one pool heat pump manual says its efficiency and heating capacity depend on the local air temperature and humidity. Ask how the quoted unit performs in your winter. It also makes some noise, needs an outdoor spot with clear airflow, and hard-wired units must be connected by a licensed electrician. In Victoria, EPA rules limit when a heat pump can be heard inside a neighbour's home, so placement matters.
Can heating be added to an existing pool?
It depends on what the site can take. Solar needs enough unshaded, ideally north-facing roof and usually its own pump. A heat pump needs an outdoor spot with clearance near the pool and a suitable power supply, and gas needs a supply line and a licensed gasfitter. Ask for a site inspection and an itemised quote that shows the heater, pump, plumbing and electrical or gas work separately.
Does a gas pool heater need a licensed gas fitter?
Yes. Energy Safe Victoria says homeowners must always use a licensed or registered gasfitter, and that unlicensed gasfitting is illegal. In Queensland, the QBCC says anyone performing gasfitting work must hold a gasfitting licence, and Western Australia's Building and Energy says the law requires all gasfitting work to be done by a licensed person. In other states, check the fitter's licence with your state regulator before work starts, and ask for any compliance paperwork when the job is done.
Is solar pool heating worth it on the Gold Coast or in Brisbane?
Brisbane's climate is kind to solar: its July days average 22.0°C at their warmest, the mildest of the four capitals compared here, so a solar season can run long. Whether it suits your home depends on the roof. SPASA recommends collector area of at least 80% of the pool's surface for most homes, on an unshaded, ideally north-facing roof. Gold Coast owners can use the same roof checks, and a cover helps hold the heat overnight.
What's the cheapest way to heat a swimming pool?
Start with a pool cover, which energy.gov.au reminds heated-pool owners to use. After that, NSW BASIX guidance describes solar as the most efficient way to heat a pool, and energy.gov.au suggests people heating with gas or electricity consider solar or a heat pump. Cheapest to run is not always cheapest to buy, so compare the up-front quote and the season running cost together.
Next steps
To see what a heated season costs to run in your city, read our pool heating cost guide. When you are ready to price a system for your own roof and pool, see solar heating for pools and ask for an itemised quote.
Sources
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