Choosing between pool heaters and heat pumps can make a big difference to how often you use your pool, how quickly the water warms up and how much you spend on running costs over time.
Whether you are looking to extend the swimming season, make your pool more comfortable during cooler months, or plan the right heating setup for a brand-new fibreglass pool, it is worth understanding how each option works before you invest.
This guide compares pool heaters vs heat pumps, including gas pool heaters, solar pool heating and electric pool heat pumps, so you can decide which option is best suited to your pool, climate, budget and swimming habits.
Key Takeaways
- Pool heaters and heat pumps are not the same. Gas pool heaters create heat by burning gas, while electric heat pumps draw warmth from the surrounding air and transfer it into the pool water.
- Gas pool heaters usually heat water faster, making them useful for spas, smaller pools, occasional swimming or when you want the pool ready quickly.
- Electric pool heat pumps are generally better suited to regular pool use because they are more energy-efficient once running.
- Solar pool heating can be cost-effective to run, but its performance depends heavily on sunshine, roof space and weather conditions.
- Pool size, climate, energy prices, wind exposure and how often you swim should all influence your decision.
- A pool cover can help reduce heat loss, improve heating efficiency and lower ongoing running costs.
- Fibreglass pools can heat efficiently because they generally retain warmth well compared with some other pool types.
Quick Answer: Should You Choose a Pool Heater or a Heat Pump?
For most pool owners who want to swim regularly and maintain a comfortable water temperature, an electric pool heat pump is usually the better long-term option. It may cost more upfront than a gas heater in some cases, but it can be more economical for regular use because it transfers heat from the air rather than creating heat directly from fuel.
A gas pool heater may be the better option if you want fast heat on demand, especially for a spa, plunge pool, smaller pool or occasional weekend swimming. It can heat water quickly, but the running costs are usually higher if used frequently.
Solar pool heating may be the best option if you live in a sunny area, have suitable roof space and want lower ongoing running costs. However, it is less reliable during cloudy, rainy or cooler periods.
Pool Heaters vs Heat Pumps: What Is the Difference?
The term “pool heater” is often used broadly, but it can refer to several types of heating systems. For this article, we are comparing traditional pool heaters, such as gas and solar systems, with electric pool heat pumps.
| Feature | Gas Pool Heater | Solar Pool Heating | Electric Pool Heat Pump |
|---|---|---|---|
| How it works | Burns natural gas or LPG to heat water | Uses solar energy collected through roof-mounted tubes or panels | Extracts heat from the air and transfers it to pool water |
| Heating speed | Fast | Slower and weather-dependent | Moderate |
| Upfront cost | Often lower than heat pumps | Moderate to high depending on roof setup | Often higher than gas |
| Running cost | Usually higher | Usually low | Usually moderate to low for regular use |
| Best for | Quick heating, spas and occasional use | Sunny climates and low running costs | Regular swimming and maintaining temperature |
| Weather dependence | Low | High | Moderate |
| Main drawback | Higher running costs | Relies on sunshine | Slower than gas and less effective in very cold air |
What Is a Gas Pool Heater?
A gas pool heater uses natural gas or LPG to warm your pool water. Water is drawn from the pool, passed through the heater and warmed as gas burns inside the combustion chamber. The heated water is then returned to the pool.
Gas heaters are one of the fastest ways to heat a swimming pool, which makes them popular for pool owners who want heat on demand.
Benefits of Gas Pool Heaters
Gas pool heaters are a strong option when speed matters. If you only use your pool occasionally, or you want to heat a spa quickly, gas can be very practical.
They can also perform better than some other systems in cooler conditions because they do not rely on direct sunshine or warm air to operate. This makes them useful in areas where temperatures drop during the colder months.
Another benefit is that gas heaters can have lower upfront costs than electric heat pumps, depending on the system, gas connection and installation requirements.
Disadvantages of Gas Pool Heaters
The biggest downside of gas pool heaters is the ongoing running cost. Because they burn fuel to create heat, they can become expensive if you use them often or keep them running for long periods.
Gas heaters also use a lot of energy, which can make them less appealing for pool owners who want a more efficient or environmentally friendly option.
They may also require more regular maintenance, especially if water chemistry is not managed properly. Minerals and chemical imbalances can affect the heater and reduce performance over time.
What Is Solar Pool Heating?
Solar pool heating uses energy from the sun to warm your pool water. Pool water is pumped through a series of solar collectors, often installed on the roof, where it is warmed before returning to the pool.
Solar heating is a popular option for pool owners who want low ongoing running costs and have good sun exposure.
Benefits of Solar Pool Heating
Solar pool heating can be cost-effective to run because it uses the sun rather than gas or electricity to generate heat. Once installed, the ongoing operating cost is generally low compared with gas heating.
It can also be a more environmentally friendly option, especially for homes with strong sun exposure and enough roof space for the solar collectors.
For pool owners in warmer, sunnier climates, solar heating can be a practical way to extend the swimming season without relying heavily on electricity or gas.
Disadvantages of Solar Pool Heating
The main drawback of solar pool heating is that it depends on the weather. On cloudy, rainy or cooler days, the system may not heat the water enough for comfortable swimming.
Solar systems also need suitable roof space and correct positioning to perform well. If your roof is shaded or poorly oriented, solar heating may not be the most reliable choice.
Solar heating is usually slower than gas heating and may not be ideal if you want fast heat on demand.
What Is an Electric Pool Heat Pump?
An electric pool heat pump uses electricity to extract heat from the surrounding air and transfer it into your pool water. It does not create heat in the same way a gas heater does. Instead, it moves existing heat from the air into the pool.
This makes electric heat pumps more energy-efficient than many traditional heating systems, especially when they are used consistently in mild or warm climates.
Benefits of Electric Pool Heat Pumps
Electric heat pumps are often a strong choice for pool owners who swim regularly and want to maintain a comfortable temperature over time.
They usually have lower operating costs than gas heaters when used frequently because they rely on heat transfer rather than burning fuel. In the right climate, they can be an efficient way to extend your swimming season.
Heat pumps are also more reliable than solar heating in some situations because they do not rely purely on direct sunshine. They can still operate when the sun is not out, provided the air temperature is suitable.
Disadvantages of Electric Pool Heat Pumps
Electric heat pumps usually heat water more slowly than gas heaters. If you want to warm the pool quickly for a last-minute swim, a gas heater may perform better.
Heat pumps can also be less effective in very cold weather because they rely on warmth in the surrounding air. If air temperatures drop too low, the system has to work harder and may become less efficient.
They can also cost more upfront than gas heaters, although the lower running costs may balance this out over time for regular swimmers.
Pool Heaters vs Heat Pumps: Which Option Suits Your Pool?
The best heating option depends on how you actually use your pool. There is no single answer that suits every backyard, but these scenarios can help narrow it down.
| Your Priority | Best Option to Consider | Why |
|---|---|---|
| Fast heating | Gas pool heater | Heats water quickly and works well for occasional use |
| Lowest running cost | Solar pool heating | Uses solar energy and can be cheap to run in sunny conditions |
| Regular swimming | Electric heat pump | Efficient for maintaining a steady temperature |
| Spa or small pool | Gas pool heater | Great for fast, high-temperature heating |
| Sunny climate | Solar or heat pump | Both can perform well depending on usage |
| Cooler climate | Gas pool heater | Less dependent on air temperature or sunshine |
| Long-term efficiency | Electric heat pump | Often more economical for frequent use |
| Eco-conscious setup | Solar or heat pump | Lower reliance on gas |
Choose a Gas Pool Heater If…
A gas pool heater may be the better option if you only use your pool occasionally and want the water heated quickly.
It can also make sense if you have a spa, smaller pool or plunge pool where fast heating is more important than maintaining the temperature every day.
Gas may also be suitable if you live in a cooler area where solar heating or an electric heat pump may not perform as reliably during winter.
Choose Solar Pool Heating If…
Solar pool heating may be the right choice if your home receives plenty of sunshine and you have suitable roof space.
It is a good option for pool owners who want lower running costs and are happy for the heating performance to depend on weather conditions.
Solar heating is best suited to people who want to extend their swim season but do not necessarily need instant heating or guaranteed performance on cloudy days.
Choose an Electric Heat Pump If…
An electric heat pump may be the best option if you want to use your pool often and maintain a more consistent water temperature.
It is especially suitable for families who swim regularly through spring, summer and autumn and want a balance between performance and running costs.
Heat pumps are also a practical choice for pool owners who want a more efficient alternative to gas but need something more reliable than solar alone.
What Else Affects Pool Heating Performance?
Choosing between pool heaters and heat pumps is important, but the system itself is only one part of the equation. Your pool, backyard and usage habits will all affect performance.
Pool Size
Firstly, consider the size of your pool. Smaller pools usually do not need as powerful a heating system, while larger swimming pools will generally require more powerful equipment to warm the water effectively.
Before choosing a heater or heat pump, make sure the system is correctly sized for your pool volume. An undersized system may struggle to heat the water properly, while an oversized system may cost more than necessary.
Climate and Weather
Your local climate plays a major role in choosing the right heating system.
If your area gets plenty of sunshine, solar heating may be very effective. If you live in a mild climate, a heat pump can be a strong option. If your area gets cold, or if you want reliable heating regardless of weather, a gas heater may be more suitable.
How Often You Swim
If you swim almost every day, a heat pump is often more practical because it is designed to maintain temperature efficiently over time.
If you only swim occasionally, a gas heater may be more suitable because it can heat the water quickly when needed.
Heating Speed
Gas heaters are usually the fastest option. Heat pumps and solar systems are generally slower and better suited to planned, consistent heating rather than last-minute use.
If you want to decide on Friday afternoon that the pool should be warm by Friday evening, gas may be the better choice. If you want the pool to stay comfortable across the week, a heat pump may be more efficient.
Energy Prices
The cost of electricity, natural gas or LPG in your area will affect the total cost of ownership. It is worth comparing the upfront price with estimated running costs before choosing a system.
A cheaper system upfront may cost more to run over several years, while a more expensive system may save money if it is used frequently.
Pool Covers
Before you start your heating journey, it is a good idea to invest in a pool cover as well. A cover helps reduce heat loss, especially overnight or during windy weather.
By keeping more heat in the water, a pool cover can reduce how hard your heating system has to work. This may lower energy use, help your pool reach the desired temperature faster and reduce ongoing heating costs.
Are Fibreglass Pools Easier to Heat?
Fibreglass pools can be efficient to heat because the shell can help retain warmth well compared with some other pool types. They can also heat up relatively quickly when paired with the right heating system and a pool cover.
This does not mean every fibreglass pool needs heating. In many Australian backyards, a pool may be comfortable during the warmer months without a heater. However, if you want to extend your swim season or use the pool more consistently, heating can make a big difference.
If you are still deciding which pool style will suit your backyard, you can view our fibreglass pool range to compare shapes, sizes and options.
Final Recommendation: Pool Heater or Heat Pump?
If you want fast, powerful heating for occasional use, a gas pool heater is usually the best fit.
If you want lower running costs and your backyard receives plenty of sunshine, solar pool heating may be worth considering.
If you want to swim regularly and maintain a comfortable water temperature across the season, an electric pool heat pump is often the most balanced long-term option.
The right choice depends on your pool size, location, budget, energy prices and how often you plan to swim. If you are installing a new fibreglass pool, it is worth discussing heating early in the design process so the system can be planned properly from the start.
Whether you are comparing pool heaters vs heat pumps or still deciding which fibreglass pool is right for your backyard, contact our highly skilled team here at The Fibreglass Pool Company. We would love to help you choose a pool and heating setup that suits your home, budget and lifestyle.
For an obligation free quote, get in touch with our friendly team today.
Frequently Asked Questions
Are pool heaters and heat pumps the same thing?
Is a heat pump better than a pool heater?
Which is cheaper to run, a gas pool heater or a heat pump?
Is solar pool heating better than a heat pump?
Can a heat pump heat a pool in winter?
A heat pump can heat a pool in cooler weather, but its performance depends on the air temperature. Because it draws heat from the surrounding air, it may become less efficient in very cold conditions. In colder areas, gas heating may be more reliable for winter use.
Do I need a pool cover if I have a heater or heat pump?
A pool cover is strongly recommended because it helps reduce heat loss. This can make your heating system more efficient, reduce running costs and help the pool stay warmer for longer.
What size pool heater or heat pump do I need?
The right size depends on your pool volume, location, desired temperature, usage habits and how quickly you want the water to heat. A small pool may need a less powerful system, while a large family pool will usually need a stronger heater or heat pump. A pool professional can help size the system correctly.