Paul Mueller Fre-Heater Recovery System recover up to 60 percent of wasted energy normally discarded from refrigeration and conditioning systems. Often used in supermarkets, grocery stores, and convenience stores. Fre-Heaters are de-superheaters that remove most or all of the sensible heat from compressors hot discharged gas and use the existing condenser to remove the remaining heat and condense the refrigerant. Model No: D-2VA-105. Part Number: 8801975. Serial No: 90-C-0005-R. Tank Capacity(Gal): 105. Tank Working Test Pressure(PSIG): 150/300. Refrigeration Working Pressure(psig): 426. Refrigeration Type: R-12,R-22,R-502, R-717.