Heat Pump vs Gas Heater — Which Is Better for Perth Pools?

For most Perth pool owners, a heat pump is the better long-term investment. With Western Australia's mild winters and high ambient temperatures for much of the year, air-source heat pumps operate at peak efficiency, delivering significantly lower running costs than gas heaters. That said, gas heaters still have their place — particularly when rapid heat-up is the priority or for pools that are used infrequently.

How Does a Pool Heat Pump Work?

A pool heat pump works like a reverse-cycle air conditioner. It draws warmth from the surrounding air using a fan and evaporator coil, then compresses that heat and transfers it to your pool water via a titanium heat exchanger. The key metric is the Coefficient of Performance (COP) — a COP of 5.0 means the unit produces five units of heat energy for every one unit of electrical energy consumed. In Perth's warm climate, most quality heat pumps achieve a COP between 5.0 and 7.0 for much of the swimming season.

How Does a Gas Pool Heater Work?

Gas heaters burn natural gas or LPG to heat water directly. Cold pool water flows through a combustion chamber where it is rapidly heated before returning to the pool. Gas heaters are powerful and can raise water temperature quickly — often by several degrees per hour — regardless of the ambient air temperature. This makes them the go-to option when you need your pool warm right now.

Running Cost Comparison for Perth Pools

This is where the difference becomes stark. Based on current Perth energy rates, running a heat pump for a typical 40,000-litre pool costs approximately $1.50 to $3.00 per day during the swimming season. A gas heater running the same pool can cost $15 to $30 per day depending on gas type and desired temperature. Over a full season, that translates to hundreds — even thousands — of dollars in savings with a heat pump.

The reason is simple: a heat pump moves heat rather than creating it. It leverages free energy from the air, so you are only paying for the electricity to run the compressor and fan — not for the fuel to generate all the heat from scratch.

Installation Cost Comparison

Gas heaters are generally cheaper to purchase upfront, with units starting from around $2,500 to $4,000 installed. Heat pumps typically cost between $4,000 and $8,000 installed, depending on capacity and brand. However, the higher upfront cost of a heat pump is usually recovered within two to three swimming seasons through lower running costs — making it the smarter investment for pools used regularly.

Perth's Climate Advantage for Heat Pumps

Perth is one of the best cities in Australia for heat pump performance. Our mild winters rarely drop below 8°C overnight, and daytime temperatures through autumn and spring sit comfortably in the high teens to mid-twenties. Since heat pumps extract warmth from ambient air, Perth's climate means they operate efficiently for eight to ten months of the year. In colder parts of Australia, heat pumps struggle in winter — but that is rarely an issue here in WA's northern suburbs.

When Does a Gas Heater Make More Sense?

Gas heaters still win in specific scenarios. If you only use your pool on weekends and want it heated quickly from cold, a gas heater can bring the temperature up in a few hours. Heat pumps, by contrast, work gradually — typically raising the temperature by 1 to 2°C per day. Gas is also the better option for indoor pools or enclosed pool areas where airflow is restricted, as heat pumps need good ventilation to operate efficiently.

Environmental Impact

Heat pumps produce significantly fewer carbon emissions than gas heaters. Because they rely primarily on ambient air energy and use only a small amount of electricity, their carbon footprint is a fraction of a gas unit. For Perth homeowners with rooftop solar panels, the advantage is even greater — you can run your heat pump during peak solar generation hours and heat your pool with virtually zero energy cost.

Pairing a Heat Pump with a Pool Cover

The single most effective way to maximise your heat pump's efficiency is to use a quality pool cover. An uncovered pool can lose up to 70% of its heat through evaporation overnight. A good solar or thermal cover retains that heat, meaning your heat pump does less work to maintain temperature. The combination of a heat pump and pool cover is the gold standard for energy-efficient pool heating in Perth — reducing running costs by up to 50% compared to a heat pump alone.

Which Brands Does Poolwise Recommend?

At Poolwise Padbury, we stock and install leading pool heat pumps from trusted brands sized to suit Perth pools from 20,000 to 100,000 litres. Our team can assess your pool size, exposure, and usage pattern to recommend the right unit — ensuring you get the performance you need without overspending on capacity you do not require.

Get a Heat Pump Quote from Poolwise Padbury

Ready to extend your swimming season without blowing your energy budget? Visit us at Shop 14, 75 Warburton Avenue, Padbury WA 6025 or call (08) 9403 6000 for a personalised heat pump recommendation and quote. We will help you choose the right system for your pool and your budget — backed by expert installation and local after-sales support.