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  4. Pool Air Source Heat Pump...

Pool Air Source Heat Pump

Air source heat pumps are an ultra-efficient, economical and "green" way to heat swimming pool water. In fact, air source heat pumps have the lowest carbon footprint and lowest operating costs compared to other heating methods. For the most modern, efficient, reliable and environmentally friendly heating of your swimming pool, we do not hesitate to recommend our low cost air source heat pumps.

 

How does a pool heat pump work?

 

Swimming pool heat pumps do not generate heat directly, they use a small amount of electricity to capture the abundant heat in the air and transfer it efficiently to the water in the pool.

 

The heat pump, combined with the pool filtration and pumping system, circulates, cleans and heats the pool's water through the sand filter and then through the heat pump heat exchanger. Heat pump heaters contain a fan that draws in outside air and directs it over the evaporator coil radiator. The evaporator coil contains a liquid refrigerant that absorbs heat from the outside air and converts it into a gas. The hot gas in the coil passes through the compressor. The compressor then adds heat, producing extremely hot gas, which then passes through the condenser. The condenser then transfers heat from the gas to the cooler pool water, which circulates through the heat pump pool heater. The heated water is then returned to the pool. As the hot gas flows through the condenser coil, it cools rapidly and returns to the evaporator, returning to liquid form. Then the whole process starts all over again.

 

How long does it take for a heat pump to heat a swimming pool?

 

A properly sized heat pump will usually heat the pool in about 4 to 5 days.

 

However, you can use the following formula to get a more accurate estimate for a specific pool:

 

Seconds = liter x 4.18 (specific heat capacity of water) x temperature difference/kW

 

So if you have a 12kW heat pump on an 8m x 4m x 1m (average depth) swimming pool and you want to heat it to 25 degrees (assuming 5 degrees cold water) then the calculation is as follows:

 

Seconds = 32000 x 4.18 x 20 ÷ 12

 

This equals 222, 933 seconds or 62 hours

 

This does not take into account any heat loss during heating and therefore needs to be added.

 

How efficient is a swimming pool heat pump?

 

A dedicated swimming pool air source heat pump can actually be around 500% efficient, which means it will generate 5 kWh of heat for every kWh of electricity it uses. The efficiency of the heat pump is proportional to the ambient temperature of the air and the target temperature of the water. The farther apart these two temperatures are, the lower the efficiency

There are some reasons for and against the use of heat pumps as a source of heat for swimming pools.

 

On the plus side, heat pumps use electricity, so you can use the electricity generated from the photovoltaic panels to power the heat pump.

 

They are also very efficient, and for every 1kWh of electricity you consume, you have the potential to gain 5kWh of heat.

 

However, swimming pools require a lot of energy to heat, so you need to make sure your home's electricity supply is sufficient for the extra load of pool heating.

 

Heat pumps are not as fast as heating pool water compared to fossil fuel heaters and may have noise associated with air source heat pumps

 

What size heat pump do I need for my swimming pool?

 

The size of the pool and heat loss needs to be defined, then a suitable heat pump is specified to make up for the heat loss, and it also has the ability to reheat the pool if you allow it to cool seasonally.

 

Many swimming pool circulators will run about eight hours a day. The heat pump should be able to deliver the required heat to the pool during these times. If reheating is required, the pool pump runs longer. Indoor pools have lower heat loss than outdoor pools, but with indoor pools, you also need to allow the air in the billiard room to be heated and circulated. The air temperature is usually kept about 3 degrees warmer than the water temperature to mitigate evaporative losses.

 

Air circulates at a much higher rate than is required in a domestic home, so standard Mechanical Heat Recovery Ventilation (MVHR) units are not suitable for this purpose. A dedicated pool ventilation unit is required, and these typically also manage heat transfer to the air and pool water.

 

How much does a heat pump for a swimming pool cost?

 

Dedicated swimming pool heat pumps can be much less expensive than air source heat pumps, which are often attached to our homes for central heating and hot water production.

 

Dedicated swimming pool heat pumps start at around £1,500, but for a complete air handling unit with thermal management you may need upwards of £15,000.

 

Do your research and identify your needs, as costs can quickly escalate.

 

The running cost of heating a swimming pool with a heat pump:


The running cost of a swimming pool heat pump will be proportional to the heat loss from the water.

 

Heat loss in outdoor pools is usually much higher than in indoor pools due to evaporative losses, lack of insulation and exposure to cold winds.

 

As a very general guide, look at the surface area in square meters, then use about 200W per square meter for a bare outdoor pool to about 50W per square meter if the pool is in a protected location with good thermal coverage.

 

If the air in the billiard room is warmer than the water, the indoor pool will lose less heat. This air heat loss should be included in the running cost of swimming pool heating.

 

Swimming pool heat pump installation:

Heat pumps are best installed outdoors. If installed indoors, they must have adequate and unrestricted outside air circulation. They must be installed and commissioned by a qualified technician in accordance with current regulations. It is recommended that you check that your power supply supports your preferred power input before ordering. Test your water regularly to avoid acid or limescale damage that could void your warranty. Heat pumps must operate within their seasonal and waste flow design limitations.

 

Heat Pump Power Output Guidelines:

As long as you keep the pool covered when not in use, these should be able to provide you with a comfortable swim throughout a typical UK open-air swimming season.


In Ground Pools

Pool size

Power / kW

24ft x 12ft 

(7.32m x 3.66m)

12 - 16

28ft x 14ft 

(8.53m x 4.27m) 

12 - 16

30ft x 15ft 

(9.14m x 4.57m)

15 - 25

32ft x 16ft 

(9.75m x 4.88m)

23 - 31

36ft x 18ft 

(10.97m x 5.49m)

23 - 31

40ft x 20ft 

(12.19m x 6.10m)

30 - 36

Above Ground Pools:

Pool size

Power / kW

12ft diameter 

(3.66m)

8 - 12

15ft diameter 

(4.57m)

9 - 16

18ft diameter 

(5.49m)

9 - 16

20ft x 12ft 

(6.10m x 3.66m)

9 - 16

24ft x 12ft 

(7.32m x 3.66m)

15 - 18

30ft x 15ft 

(9.14m x 4.57m)

15 - 25

33ft x 18ft 

(10.06m x 5.49m)

23 - 31

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    • Commercial Hot Water Heat Pumps
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