Aquacal LTP0024 is a swimming pool and spa heat pump that utilizes water as the heat source rather than air. The practical recovery of heat stored in lakes, canals, oceans, wells, cooling towers or other viable heat resources is a cost-effective method of conserving energy, The Water+ Source swimming pool / spa heat pump will provide many years of trouble-free service because of it's design: — A non-corrosive casing protects components from corrosion. — The aluminum chassis will not rust — The insulated evaporator prevents condensate from forming inside the unit. — Acrylic paint resists aggressive salt air in coastal climates,