What is the difference between a non-inverter and a inverter heat pump for swimming pool?

An “air to water” heat pump is used to regulate the temperature of a swimming pool by transferring heat from the surrounding air to the pool water. The heat pump works by extracting heat from a low-temperature source, such as ambient air, then compressing and transferring that heat to the pool water, which raises the temperature. 

In the case of a swimming pool, the heat pump can be used to warm or cool the pool water, making it more comfortable to swim in and extending the swimming season. It can also be used to maintain a consistent temperature throughout the year, regardless of changes in weather. 

When selecting a heat pump for your swimming pool, you will likely come across the terms "inverter" and "non-inverter" or “on-off” heat pumps. These terms describe the type of compressor used in the heat pump, and each has its benefits and drawbacks. In this article, we'll discuss the difference between inverter and non-inverter heat pumps and help you determine which is right for your swimming pool.

Comparison non inverter and inverter

Non-Inverter Heat Pumps 

A non-inverter heat pump has a fixed-speed compressor that operates at a constant speed. When the pool needs heating, the compressor turns on and runs at full capacity until the desired temperature is reached. Once the pool is heated, the compressor turns off until the temperature drops and the process repeats.

One of the main benefits of a non-inverter heat pump is its affordability. Non-inverter heat pumps are typically less expensive than their inverter counterparts, making them a popular choice for those on a budget. They are also easier to install and maintain, making them an excellent option for those who want a low-maintenance pool heating system. 

However, non-inverter heat pumps can be less efficient than inverter heat pumps. Because the compressor runs at a constant speed, it may use more energy than necessary to heat the pool, leading to higher energy bills. Additionally, the constant on-off cycling of the compressor can cause wear and tear, reducing the lifespan of the heat pump. 

Inverter Heat Pumps 

Inverter heat pumps use a variable-speed compressor that adjusts its speed based on the heating needs of the pool. When the pool needs heating, the compressor increases its speed to provide more heat. As the pool reaches the desired temperature, the compressor slows down to maintain it. Inverter heat pumps are designed to be more efficient than non-inverter heat pumps because they only use the energy necessary to heat the pool. 

Another benefit of inverter heat pumps is their quiet operation. Because the compressor operates at a variable speed, it is much quieter than a fixed-speed compressor. This makes inverter heat pumps an excellent choice for those who want to enjoy a peaceful, relaxing swim without the noise of a constantly running compressor. 

However, inverter heat pumps are typically more expensive than non-inverter heat pumps, making them less accessible for those on a budget. They can also be more complicated to install and maintain, requiring a higher level of expertise. 


Performance comparison between non inverter and inverter

Comparison between Inverter and non-inverter heat pump

Let’s compare the performance of an Inverter heat pump and a non-inverter heat pump to better understand the difference in output and power consumption.

For a full inverter heatpump we chose Pro Elyo Touch PET-10 model and for a non-inverter heat pump we have Evoline 13

Non inverter pool heat pump


Heating capacity: 10.4 kW

Power consumption: 1.9 kW

Comparison Inverter heat pump


Heating capacity: 10.5 - 2.3 kW

Power consumption: 1.7 - 0.15 kW

As per the above comparison, you can see that the Inverter model will vary their power consumption based on the pool's temperature, the compressor slows down when the desired temperature is reached.

The non-inverter heat pumps will run at a constant speed and consume a fixed amount of power. They turn on when the pool needs to be heated and shut off once the desired temperature is achieved.

Therefore, when comparing the two, the inverter heat pump offers greater efficiency by adapting its power consumption to meet the pool's needs, while the non-inverter heat pump operates at a fixed power level, turning on and off based on the desired temperature.

Pool water when heat pump is used Swimming in pool warm water

Which is Right for Your Swimming Pool? 

When deciding between an inverter and non-inverter heat pump for your swimming pool, consider your budget, energy efficiency needs, and desired level of maintenance. If you're on a budget and want a simple, low-maintenance system, a non-inverter heat pump may be the best option for you. If you're looking for an energy-efficient, quiet, and more advanced system, an inverter heat pump may be the better choice. 

Ultimately, the decision comes down to your specific needs and preferences. Consult with a professional pool heater installer to discuss which type of heat pump is right for your pool and budget.