A water-source heat pump does not require a defrost cycle because:
A) It uses buried loops in which water is circulated, and the heat is then extracted from the water.
B) Most water-source units use a single bi-flow thermostatic expansion valve.
C) The fluid circulating through the water-source unit cannot be allowed to freeze.
D) There are no check valves or extra metering devices within a water-source heat pump.
C
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