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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.
If you are trying to heat a pool/spa combo, a 400 btu pool heater (the Big Boy) is usually used for fast (15 - 30 minutes) heat up of the spa. Using a spa solar blanket cover can reduce the heat up time by a few minutes.