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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.
The thermostat may be set too low. If the heat loss is greater than the heater input-the heater may be too small, outside air temperature is too low, or your heater may have an inadequate gas supply. You may want to install a solar pool cover to slow heat loss from your pool.he pool heater heat exchanger may be leaking because of chemical or sanitizer damage. The damage may be from winter freeze-usually leaking upon spring start-up, and usually on the return manifold, aka rear header. There could be a gasket leaking, or a loose connection to the pressure switch.