Raypak, a subsidiary of Rheem Manufacturing, is a well known manufacturer of heater, furnace and air conditioning products sold throughout North America. In addition to residential and commercial heaters, Raypak also specializes in heating for outdoors and heaters and heat pumps for swimming pools and outdoor spas. Raypak's extensive line of pool heaters includes millivolt, gas-powered and electronic styles in every size. Raypak heaters and heat pumps are marketed under popular names such as Versa, Versa Plus and Versa II. All Raypak pool heaters and pool heater pumps are reputed for being highly efficient and cost effective, and start at approximately $550 online.