How the Swimming Pool Heat Pump works

As the pool water circulates through the heat pump, it passes through the filter and heat pump heater. Heat pump heaters have a fan that draws in outside air and directs it over the evaporator coil. The liquid refrigerant inside the evaporator coil absorbs heat from the outside air and turns into a gas. The hot gas in the coil then passes through the compressor. The compressor adds heat, creating a very hot gas that goes through the condenser. The condenser transfers heat from the hot gas to the cooler pool water that circulates through the heater. The heated water is then returned to the pool. As the hot gas flows through the condenser coil, it returns to its liquid state and back to the evaporator, and the whole process begins again.

More efficient heat pump pool heaters often use scroll compressors than standard units reciprocating compressors.

Heat pump pool heaters work efficiently as long as the outside temperature remains above the 45ºF–50ºF range. The colder the outside air they draw in, the less efficient they are, resulting in higher energy bills. However, since most people use outdoor pools in warm and mild weather, this is usually not a problem.

How to choose a pool heat pump?

Heat pump pool heaters cost more than gas pool heaters, but because of their higher efficiency, their annual operating costs are usually much lower. With proper maintenance, heat pump pool heaters typically last longer than gas pool heaters. So you will save more money in the long run.

Sizing a Heat Pump Pool Heater

You should have a trained pool professional perform a proper sizing analysis for your specific pool to determine the size of your pool heater.

There are many factors involved in sizing a heat pump pool heater. Basically, the size of the heater depends on the surface area of ​​the pool and the difference between the pool and the average air temperature. Other factors can also affect the heat load of an outdoor pool, such as wind exposure, humidity levels, and cool nighttime temperatures. Therefore, pools located in areas with higher average wind speeds on the pool surface, lower humidity, and cooler nights will require larger heaters.

Heat pump pool heaters are rated by Btu output and horsepower (hp). Standard sizes include 3.5 hp/75,000 Btu, 5 hp/100,000 Btu and 6 hp/125,000 Btu.

To calculate the approximate heater size for an outdoor pool, follow these steps:

Determine your desired pool temperature.

Determine the average temperature of the coldest month for pool usage.

Subtract the average temperature of the coldest month from the desired pool temperature. This will give you the desired temperature rise.

Installation and Maintenance

Proper installation and maintenance of your heat pump pool heater can optimize its efficiency. It is best to have a qualified pool professional install heaters, especially electrical connectors, and perform complex maintenance or repair tasks.

Read your owner's manual for maintenance schedules and/or recommendations. You may need to adjust your pool heater annually. Due to the many moving and electrical parts of a heat pump pool heater, it may require regular servicing by an air conditioning technician.

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