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Solar Covers heat your pool in two stages: first by absorbing solar energy to heat the pool, and then by retaining the heat to keep the water warmer longer. The small bubbles on the Solar Cover are filled with air that heats up when the cover is in the sun.
A solar pool heater can be less expensive up front than an electric heater, heat pump, or gas heater, depending how large your pool is. Once a solar pool heater is installed, you heat your pool for free. With an electric or gas heater you need to pay the electric or gas company depending on how much you use the heater.