Electric Heaters

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 A front-vent heat pump (for pools) is a type of pool heater designed with its air intake and/or exhaust located on the front panel, rather than the sides or rear.

 A side-vent heat pump (pool heat pump) is a pool heating system where the air intake and exhaust are located on the sides of the unit, rather than the front or rear. 

 A top-vent heat pump (pool heat pump) is a pool heating system where the air is drawn in and/or expelled through the top of the unit, rather than the sides or front.