Rheem Water Heaters announced that it will be returning to the AHR Expo® after a two-year absence from this annual exposition of heating, ventilation, air-conditioning and refrigeration products. Rheem Water Heaters will join two sister divisions of the Rheem Manufacturing Co. - Rheem Air Conditioning and Raypak - in mounting a 2,000-sq. ft. exhibit at AHR Expo 2004, Jan. 26-28 in Anaheim, Calif.