2. Do I Need a Thermal Pool Blanket?
The thermal losses on the surface of a pool is significant and can drastically cool down the pool. This will get worst when even a slight breeze is blowing over the surface of the pool. The more the thermal loss the harder the heat pump will have to work to maintain the desired temperature. It is therefore highly recommended to always use a thermal pool blanket to cover the pool when not in use. Even for indoor swimming pools this is important as the evaporation from the surface of the pool will cause heat loss and high levels of humidity inside the building.
If for some reason a thermal pool blanket can’t be used we would normally recommend the heat pump to be 2 to 3 times the output power. In other words, due to the losses you will now need to spend a lot more money on the heat pump purchase and potentially 2 to 3 times more money on electricity per month to
maintain the desired temperature. Even then the system might still struggle to reach the desired temperature especially when the desired temperature is more than a 15oC increase in pool temperature and there is wind blowing over the pool.
Please note that the use of the correct type of pool thermal blanket will also substantially reduce evaporative water loss, filtration pump time and chemical use and therefore is highly recommended even if you are not interested in a heated pool.