An air energy water heater having a pressure reducing function; a water tank (8) is blow-molded, injection-molded or rotation-molded with nonmetal material, or is made of metal material; a flow switch or flow sensor (4) having the pressure reducing function is mounted on the water inlet pipe of the water tank (8); a closed or semi-open water heater (16) for heating passing water is mounted in the water tank (8); and a heating element uses a metal heating pipe, or a nonmetal halogen pipe or a carbon fiber pipe.
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