Once you know the correct pool heat pump size required for your pool, you can confidently buy a unit that ensures you have the perfect temperature to enjoy swimming all year round.
There are factors to consider in determining the right pool heater size, including:
You can use an online swimming pool heat pump size calculator that takes into account pool dimensions as well as location, heat loss rate, average depth and so on.
Correct heat pump pool heater sizing ensures that you maintain the comfortable temperature you want, and for most people, the ideal temperature is more or less 29C.
The main problem with heating a pool is heat loss, not water volume. Pool water loses heat via evaporative cooling that naturally occurs due to solar radiation. It is the job of the heat pump to replenish heat when cooling occurs.
Thus, the rate of heat loss of your pool should also be considered when choosing the right pool heat pump size.
To calculate estimated heat loss for a 6 m x 9 m pool with a water temperature of 24C and air temperature of 18C:
Thus, the heat loss rate for this pool is 8.75 kW.
For round-shaped pools (including oval-shaped pools), use the radius in calculating the surface area. With the use of a pool heat pump size calculator, multiply the radius (r) by itself and with the constant pi (3.14).
That is R x R x 3.14. For a rounded pool with a radius of 4.6 m under the same temperature conditions, the surface area is 4.6 x 4.6 x 3.14 = 66.44 m2.
Then multiply 66.44 x 6 x 0.027. The heat loss rate for this particular pool is 10.76.
Another way to determine the right pool heater size without using a swimming pool heat pump calculator is by basing it on the pool’s volume.
This is an easier method of estimating because you only need to look at a heat pump sizing chart available online. Some charts even specify the BTUs required for a particular swim season.
Here is a chart based on volume:
Pool water volume | Summer | Spring & Fall | Extended |
37,584 litres | 14.65 kW | 14.65 kW | 24.91 kW |
75,708 litres | 24.91 kW | 24.91 kW | 32.24 kW |
94,635 litres | 24.91 kW | 32.24 kW | 36.63 kW |
*Sizing based on in-ground pools
Your heat pump should be able to heat your pool by at least 0.11 degrees per hour. In other words, pool heaters should be able to increase water temperature by at least 0.560C per hour on an 862-litre of volume. That is the minimum requirement.
Heat pumps have kW ratings between 14.65 kW to 43.96 kW. Smaller pools can get away with a 14.65 kW heat pump. For a larger pool, you might need a unit that heats water faster.
If your pool heater cannot replace heat lost through evaporative cooling, it can be undersized and needs replacement.
Also, do not worry about oversizing. The larger the output is, the faster your unit can heat water.
Generally speaking, it is important to oversize the heat pump as possible. Doing so means warming your pool fast while minimising energy costs.
Which pool equipment is better – a gas heater or a heat pump? It depends on your requirements. But in terms of the operating costs, heat pumps are the better option.
The running cost of heat pumps is lower because they generally use less energy over long periods than gas heaters.
Another advantage of heat pumps is they last a longer time. Because of the high heat produced within the unit and its movable parts, a gas heater requires frequent repairs and fails before most heat pumps will.
Under careful maintenance, a pool heat pump can last up to 10 years or more. Keep your pool equipment free of debris, such as pine needles and leaves.
Also, ensure that rodents are kept at bay. Turn your heater off when it is not in use.
We’re experts in Pool Heating solutions. Based on the size of your pool. we can let you know exactly what pool heat pump will fit your needs without blowing your budget.
Simply call us on 0477241953 today.
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