Pool Heat Pumps

Pool Heat Pumps

Swimming pool heat pumps give the lowest running cost for heating a swimming pool compared with other pool heating methods. Our range of inverter driven air source pool heaters can deliver up to 13kw of heat to the pool for every 1kw of electricity used.

Pool-heat-pumps work like air conditioning units in reverse and take FREE heat from the air to give cost effective pool water heating and very low running costs. They are easy to install and can be used to heat swimming pools and koi ponds

At HeatPumps4Pools, we have the widest range of pool heaters and heat pumps at the lowest prices backed with expert advice and support. Please click on a model below for more information and a sizing guide

If you need any assistance in selecting the best heat pump for your pool, please Contact Us and we will be happy to provide FREE sizing information and advice.

You can also use the FILTERS at the left of the page to filter our heat pumps by type, phase, season and fan direction

Please click on a category below for more details:-

How Swimming Pool Heat Pumps Work

Heat pumps use technology similar to air-conditioning units. They use a fan and compressor to take heat from the surrounding air and transfer it to your pool.

The fan blows air out of the unit and in doing so, air is drawn over the evaporator coil (around the outside of the unit on the above diagram)

This then transfers heat from the air to the refrigerant gas inside the refrigerant pipes.

The compressor compresses the refrigerant gas which causes it’s temperature to increase considerably

This hot gas is then passed through a heat exchanger which has the pool water flowing around the hot refrigerant gas causing heat to be transferred to the pool water

Heat Exchanger

The Refrigeration Cycle

For every £1 that you spend on electricity with a heat pump, approximately £5 will go into your pool. With modern inverter driven heat pumps, this can be up to 14kw of heat for every 1kw of electricity used ! The electricity to the heat pump simply powers the fan and compressor. The system takes heat from the surroundng air and transfers it to the pool using the refrigeration cycle.


At stage 1,  a unit of electrical energy (you pay for) runs the compressor which sucks evaporating freon gas from the liquid filled evaporator tube. This causes a strong cooling effect (just like sweat evaporates from you skin & cools you off). The gas picks up four units of heat (FREE) from the air flowing over the outside of the evaporator tubes.

At 2 the compressor squeezes this gas, causing its temperature to climb above 200° F (93° C) Result: Five units of heat added to the gas.

At 3 the hot,high pressure gas flows through the inside of the condenser coil. The colder 80° F (26° C) pool water picks up the five units of heat from the freon which cools it down back to a warm liquid.

At 4 the warm liquid is forced through a valve. As it drops in pressure, it rapidly expands and becomes extremely cold liquid .This liquid flows back into the evaporator At 1 where it repeats the cycle

The output of all air source heat pumps is dependent on the ambient air temperature.

As the air temperature falls, the heat output from the heat pump will also be reduced.

It is therefore important that the choice and sizing of the heat pump takes into account the lowest air temperature that it will be required to operate in.

Our sizing advice will take into account the output of the heat pump at the lowest air temperature.

Please contact us for help and advice on the best model and size of heat pump for your pool.

For all enquiries, please contact us at enquiries@heatpumps4pools.com