If the boiler serves only one building, select single building boiler as the equipment type and the fuel type that fires the boiler (natural gas, distillate oil, etc.). If the steam is piped in from a central boiler plant or purchased from offsite, select central steam as the fuel type and specify the equipment type as either a radiator, fan coil, or air handling unit using central steam or hot water (in-building equipment is a heat exchanger). For steam purchased from an off-site supplier, input a price for purchased central steam in the non-electric energy price inputs. For self-generated steam, create a central plant record, associated conversion equipment, and thermal loops within the central plant and thermal loops inputs.