Abstract: A boiler apparatus is provided with a forwardly-opening hinged door. To open the door, the top of the door is moved away from the housing and toward the technician. One or more hinges may be located at the bottom of the door. Since the door does not open sideways, the apparatus requires reduced side-to-side floor space. The door may be used to obtain access to heat transfer surfaces. The door is preferably constructed to minimize the floor space occupied by and required to service the apparatus. The apparatus may include a stand for supporting the boiler at an elevated location for inspection and maintenance. A water tank may be located underneath the boiler.

Abstract: An air purging system for an oil burner system having at least one fuel burner nozzle is disclosed. The system has a pump having an inlet communicating with the fuel source and an outlet. A control valve is provided for regulating the pressure of the fuel supplied from the pump to the at least one fuel burner nozzle. A control valve has an inlet passage for receiving high pressure fuel from the outlet of the pump, an outlet passage for delivering fuel to the at least one fuel burner nozzles, and a return passage for permitting high pressure fuel not supplied to the one or more fuel burner nozzles to return to the fuel source. The system includes a passageway connecting the pump outlet and the control valve inlet. An air purging assembly is connected on one end to the pump outlet with the other end in communication with the fuel source.