This Low Return Vacuum heating unit consists of a combination air and water pump that performs both the condensate and vacuum pumping functions. The multi-jet configuration has proven to be an effective and reliable means for elimining air and lifting hot condensate in the return system. A standard steel receiver is provided for years of serviceabiity. The standard unit is configured for usage with low returns and system capacities ranging up from 2,500 square feet EDR; air pumps range up from 3 cubic feet per minute (cfm) at 5-1/2" HG at 160°F. This unit is completely packaged along with electrical controls.