In theory, a heat pump can heat water up to 41°C, provided that there is no heat loss – but there is always heat loss when the pool is located outdoors. How much depends on the insulation of the pool, the amount of sunlight that it receives and whether it is sheltered against the wind.
When the water surface is protected by thermal cover, a rule of thumb says that a traditional heat pump can raise the pool water temperature by up to 10°C above the ambient air temperature. This means that the water can be up to 30°C warm if the air temperature is 20°C.
See the heat pump selection here.
How to find the right heat pump
It is necessary to understand that the heat capacity and the performance of the pump depend on the climate you live in. Areas with cold climates have a shorter swimming pool season. Therefore, hot pool water in the north requires heat pumps with higher capacity than in medium to warmer climates.
The illustration is an approximate estimate of the climate differences, and thus an indication of what type of heat pump you should consider buying to get the right performance.
