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Before starting to build the pool, it is a good idea to think about how it will be heated. Solar absorbers are a very good solution. They function as follows: filtered water passes through the absorbers heated by the sun and flows directly into the pool. This direct option results in very little heat loss. The goal is for as much water as possible to pass through the absorbers in order to heat the pool quickly and evenly.
Solar collectors are a more complex system that consists of two circuits. In one circuit, a heating fluid circulates, which, through a heat exchanger, transfers its heat to a second circuit, from where the water can now be used. The goal of solar collectors is to heat the water in a container, from where it can be used for domestic purposes. Solar collectors are 2-3 times more expensive than absorbers.
Solar absorbers are made of polypropylene, polyethylene or ethylene-propylene-diene-monomer (EPDM). All three materials have the following qualities: they are resistant to UV rays as well as to the preparations from the pool water, temperature and cold resistant.
The required quantity and size of the absorbers depends on the position of the pool, the presence or absence of a solar cover, the desired temperature of the water in the pool. The location of the absorbers should be south and near the pool to reduce heat loss. They can be installed both on the roof and on the ground.
The required number of absorbers for a given pool is determined as follows:
The ratio between the area of the absorbers and the area of the pool should be at least 50% (better 75%).
Example: If you have an outdoor pool with dimensions of 8 x 4 = 32 sq.m. In this case, the minimum area of the absorbers should be 16 sq.m., it would be better if it was 24 sq.m.