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How efficient is a heat pump
heater
Heat pumps are given a special rating called the COP (coefficient of
performance) rating, which is generally given a numeric value of 3
to 6 COP, which converts to an efficiency of 300 to 600%.
Because heat pumps are not rated by any governing body, the
manufacturer determines the BTU output at a specific water/air
temperature and relative humidity value. These test values must be
the same to accurately compare one unit to another; otherwise, the
comparison could get distorted.

3 types of pool
heaters:
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