How an inverter pool heat pump works

An inverter swimming pool heat pump keeps water warm and welcoming in any weather – all with excellent energy and cost efficiency. But how does a pool heat pump work? Driven by electricity, a pool heat pump draws in natural heat from the outside air to warm the water. The next generation of inverter pool heat pumps intelligently adjusts the operating capacity to improve the efficiency of air-water heating exchange and bring more extra benefits. NCS Pool Heating Systems has been supplying and installing pool heat pumps across NSW for decades. We are the only authorised distributor of Rheem Heat Pumps in Newcastle, the Central Coast, the Hunter and Mid North Coast. Here, we explain how pool heat pumps work and ways you can maximise their efficacy. Keep reading to discover the mechanisms behind this pool heating solution – and how it can bring you comfort and cost savings in the long run!

What is a pool heat pump?

A pool heat pump is a clever device that pulls heat from the air and transfers it into your pool water for a comfortable swimming temperature.  And no, it doesn’t need to be blazing hot outside to work—these pumps do their magic as long as the air temperature is above 7–10°C. They gradually raise the water temperature by 3–5 degrees before circulating the warmed water back into your pool, ensuring every swim is a delight. With a lifespan of 10–20 years (or even longer with proper care), pool heat pumps are a solid investment for pool owners. They’re reliable and energy-efficient, functioning independently of sunlight, unlike solar heaters.  Many models also feature a cooling mode, making them ideal for keeping your pool refreshing during those tropical or hot summer days when a little cool water is just what you need. If you prefer your pool water warm and welcoming, then a pool heat pump is a fantastic choice. It’s eco-friendly, long-lasting, and designed to make every dip enjoyable. For those looking for a reliable and energy-efficient option, Rheem inverter pool heat pumps are an excellent choice, offering advanced technology to maintain your ideal swimming temperature.

Inverter pool heat pump technology

When it comes to maintaining the perfect pool temperature all year round, inverter technology is a game-changer.  The main difference between a fixed output heat pump and an inverter heat pump is how they handle your pool’s heating needs. A fixed output heat pump is pretty straightforward—it’s either running full blast at 100% power or completely off. When it’s on, it works flat out to heat your pool, even if that much power isn’t always needed. Unlike traditional pool heaters that operate at a constant speed, inverter pool heat pumps adapt to your pool’s specific heating needs.  They use a variable-speed compressor that can ramp up or slow down to match the exact amount of heat your pool requires, depending on changes in the outdoor temperature.  When less heat is needed, the pump runs at a lower speed, saving electricity and putting less strain on its components, which also reduces the number of times it needs to start and stop. This dynamic approach ensures energy-efficient operation, precise temperature control, and significant cost savings—without compromising on comfort. The beauty of inverter technology lies in its ability to fine-tune its performance:

• Energy efficiency: By running at partial capacity when heating demand is low, the system consumes less electricity and reduces strain on components, resulting in lower energy bills and a longer lifespan.
• Precise temperature control: Inverter heat pumps maintain set temperatures more accurately, so your pool stays consistently comfortable, no matter the weather.
• Cost-effectiveness: With fewer start-stop cycles and optimised energy use, operating costs are significantly reduced compared to traditional systems.
• Quiet operation: Running at lower speeds when full power isn’t needed, inverter heat pumps operate quietly, making them ideal for residential pools.

How does a pool heat pump work?

At the heart of an inverter pool heat pump lies a variable-speed compressor controlled by an advanced inverter drive. This system allows the heat pump to adjust its output based on the pool’s heating demands.  Instead of running at full capacity all the time, as fixed-speed systems do, an inverter heat pump can increase or decrease its speed to match the required heating load. Here’s how the process works in detail:

1. The inverter pool heat pump pulls in cool water from the pool water pump
2. The water circulates through the Titanium Heat Exchanger
3. The sensor on the Titanium Heat Exchanger tests the water temperature
4. The inverter controller automatically adjusts the operation capacity
5. The fan in the pool heat pump draws in the outside air and directs it over the evaporator
6. Liquid refrigerant within the evaporator coil absorbs the heat from the outside air and becomes a gas
7. The warm gas refrigerant passes through the compressor and is heated to a high temperature
8. The hot gas passes through the coil’s condenser (Titanium Heat Exchanger). It then transfers the heat to the cooler water
9. The heated water then returns to the pool
10. The hot gas refrigerant cools and reverts to liquid form and back to the evaporator
11. The whole process starts over again and continues until the water gets heated to the goal temperature

This innovative system doesn’t rely on generating heat; instead, it extracts warmth from the surrounding air, making it a highly energy-efficient solution.  

Benefits of using an inverter pool heat pump

Unlike traditional pool heaters, an inverter pool heat pump only needs a small amount of electricity to power the compressor and the fan that pulls in the warm air and transfers the heat directly to your pool’s water.

Energy efficiency

Since most of the heat is sourced from natural air, an inverter pool heat pump like the Premier Series can offer an impressive COP of up to 15.0.  By consuming every unit of energy, it can produce 15 units of heat in return. For reference, neither gas nor electric pool heaters have a COP above 1.0.

Cost-effectiveness

With such outstanding energy efficiency, the electricity cost of inverter swimming pool pumps is incredibly low, which reflects not only on your bills but also on the environmental impact in the long run.

Eco-friendly

With advantages in low energy consumption and high efficiency in heating exchange, inverter pool heat pumps are highly eco-friendly in protecting the environment.

Silence and durability

As most noise comes from the operating compressor and fan, an Inverter pool heat pump like the Premier Series can reduce noise to as low as 42dB(A) due to its unique InverPad Technology.  Moreover, without running at full speed continuously, inverter pool heat pumps are more durable with a longer warranty than traditional on/off pool heat pumps.

Will an inverter pool heat pump work in any climate?

Inverter pool heat pumps are highly adaptable and can operate efficiently across a range of climates, though their performance depends on the ambient air temperature.  In warmer or moderate climates, they efficiently extract heat from the air to warm your pool. In colder conditions, additional measures like using a pool cover to minimise heat loss may be needed to maintain optimal performance and energy efficiency.

How long should a pool heat pump run each day?

For optimal performance, it’s best to run your pool heat pump for 10–12 hours daily in summer and 6–8 hours during winter.  The longer runtime in warmer months helps combat algae growth, which thrives in higher temperatures.  By keeping your heat pump active during summer, you not only maintain a comfortable pool temperature but also ensure the filtration system effectively removes algae and keeps your water clean.

How to boost the energy efficiency of your pool heat pump

Boosting the energy efficiency of your inverter pool heat pump is easier than you might think.  Here are some practical tips to create a comfortable pool while keeping energy use and costs under control:

• Cover your pool: Using a pool cover is one of the simplest ways to retain heat and reduce the workload on your heater. It also keeps out debris, minimises evaporation, and lowers running costs. A solar pool cover can go a step further by capturing the sun’s heat, reducing the need for your heat pump. By covering your pool when it’s not in use, you’ll prevent heat loss and optimise efficiency.
• Turn it off during downtime: If you’re closing your pool for winter or heading off on holiday, turn off your heat pump and leave the valves open. If freezing temperatures are expected overnight, drain the water from the pump and close the valves to protect the system.
• Keep water below 28°C: Maintaining a water temperature under 28°C not only conserves energy but also helps prevent algae and bacteria growth, which thrive in warmer conditions. Avoid the hassle of extra cleaning and chemical treatments by keeping your pool at an optimal temperature.
• Use an automatic timer: If your heat pump has programmable settings, schedule it to run during the warmest part of the day. This makes the most of ambient heat, prevents unnecessary operation, and helps cut down on energy waste.

How to install and maintain your pool heat pump

Getting your pool heat pump installed and keeping it well-maintained is simpler than you might think—and doing it right can save you time, energy, and money in the long run. While the best time to install a heat pump is when your pool is first built, don’t worry—it can still be retrofitted if you already have a different heating system.  A licensed electrician or pool professional is your best bet for installation, especially for anything involving electrical connections.  Here are some handy tips to ensure your heat pump is set up for success:

• Check Your power supply: Make sure your electrical system has enough capacity to run the heat pump.
• Pick the right spot: Place the unit in a well-ventilated area with enough clearance (check your manual for specifics).
• Stay close: Position the heat pump close to your pool to avoid slow circulation caused by long pipes.
• Avoid water hazards: Keep the unit away from leaky gutters or sprinklers to prevent water damage.
• Create a stable base: Use a level concrete pad to reduce vibration and keep the unit steady.
• Proper flow placement: Place the heat pump last in your pool’s flow system—unless you have a chlorinator, which can corrode the heat exchanger.
• Insulate pipes: Adding insulation to your pipes will help retain heat and improve efficiency.

Once your pool heat pump is installed, it’s pretty low-maintenance, but a little care goes a long way. Here’s what to keep in mind:

• Read the manual: Your owner’s manual is your go-to guide for maintenance schedules and recommendations.
• Inspect regularly: Check for blockages, leaks, loose connections, or debris clogging the air inlet.
• Keep water balanced: Proper pool water chemistry is key to preventing corrosion. Test and adjust weekly to keep everything in balance.
• Annual servicing: Book a professional service once a year to check the electrical components, water flow, compressor, and voltage, clean the inside, and identify any leaks.

By following these steps, you’ll enjoy a warm, inviting pool and a heat pump that runs smoothly for years to come.

Shop inverter pool heat pumps with NCS

Ready to take the plunge into energy-efficient pool heating?  Inverter pool heat pumps can slash your heating costs by up to 50%, giving you the freedom to enjoy your pool year-round or simply extend your swimming season. Beyond comfort, these energy-efficient solutions can also add value to your property. As an authorised distributor, NCS Pool Heating supplies and installs Rheem inverter pool heat pumps that keep your pool inviting while saving you money. Our qualified tradesmen can run your project from the initial plumbing through to the electrical connection, for a truly seamless experience. Let’s find the perfect heating solution for your pool. Contact our expert team today to discover how you can heat your pool effectively, efficiently, and affordably.