Abstract: A fluid heater comprises an enclosed combustion chamber, at least one burner operatively coupled to the enclosed combustion chamber and a heat transfer section. The heat transfer section has a first end operatively coupled to the enclosed combustion chamber, a second end, an outer wall defining a closed chamber therein, a fluid inlet port coupled to the outer wall in fluid communication with the chamber and a fluid outlet port coupled to the outer wall in fluid communication with the chamber. A plurality of tubes have an opened first end, an opposite opened second end and a chamber extending therebetween, wherein the plurality of tubes are mounted within the heat transfer section so that an outside wall of each of the plurality of tubes and an inside wall of the heat transfer section define the closed chamber. Each of the tube chambers are in fluid communication with the enclosed combustion chamber.

Abstract: Aqueous working fluid (WF) steam generation system including: pressure vessel containing heat exchanger; enclosed combustion air (CA) chamber; burner; another heat exchanger outside pressure vessel; and WF conduit. Heat exchanger includes first: enclosed WF chamber having WF input and output apertures (IOA); and enclosed CA passageway communicating with CAIOA and passing through enclosed WF chamber. Enclosed CA chamber includes second: enclosed WF chamber having WFIOA; and enclosed CA passageway communicating with CAIOA. Burner is connected to second CA input aperture. Another heat exchanger includes third: enclosed WF chamber having WFIOA; and enclosed CA passageway communicating with CAIOA. WF conduit connects third WF output aperture to second WF input aperture. Second WF output aperture is connected to first WF input aperture; and second CA output aperture is connected to first CA input aperture; and first CA output aperture is connected to third CA input aperture.

Abstract: Aqueous working fluid (WF) steam generation system including: pressure vessel containing heat exchanger; enclosed combustion air (CA) chamber; burner; another heat exchanger outside pressure vessel; and WF conduit. Heat exchanger includes first: enclosed WF chamber having WF input and output apertures (IOA); and enclosed CA passageway communicating with CAIOA and passing through enclosed WF chamber. Enclosed CA chamber includes second: enclosed WF chamber having WFIOA; and enclosed CA passageway communicating with CAIOA. Burner is connected to second CA input aperture. Another heat exchanger includes third: enclosed WF chamber having WFIOA; and enclosed CA passageway communicating with CAIOA. WF conduit connects third WF output aperture to second WF input aperture. Second WF output aperture is connected to first WF input aperture; and second CA output aperture is connected to first CA input aperture; and first CA output aperture is connected to third CA input aperture.

Abstract: A steam generator including a steam chamber defining an enclosed fluid chamber with a plurality of tubes passing through the steam chamber, a combustion chamber defining a closed fluid chamber and an air channel coupled to a burner, and a heat transfer section defining a closed fluid chamber and an air passage in fluid communication with a vacuum source, in which the burner generates a heated air mixture, the vacuum source draws the heated air mixture from the combustion chamber air channel, through the steam chamber plurality of tubes and through the heat transfer section air passage so as to heat fluid passing through the heat transfer section, the steam chamber and the combustion chamber fluid chamber.

Abstract: A steam generator including a steam chamber defining an enclosed fluid chamber with a plurality of tubes passing through the steam chamber, a combustion chamber defining a closed fluid chamber and an air channel coupled to a burner, and a heat transfer section defining a closed fluid chamber and an air passage in fluid communication with a vacuum source, in which the burner generates a heated air mixture, the vacuum source draws the heated air mixture from the combustion chamber air channel, through the steam chamber plurality of tubes and through the heat transfer section air passage so as to heat fluid passing through the heat transfer section, the steam chamber and the combustion chamber fluid chamber.

Abstract: A fluid heater comprises an enclosed combustion chamber, at least one burner operatively coupled to the enclosed combustion chamber and a heat transfer section. The heat transfer section has a first end operatively coupled to the enclosed combustion chamber, a second end, an outer wall defining a closed chamber therein, a fluid inlet port coupled to the outer wall in fluid communication with the chamber and a fluid outlet port coupled to the outer wall in fluid communication with the chamber. A plurality of tubes have an opened first end, an opposite opened second end and a chamber extending therebetween, wherein the plurality of tubes are mounted within the heat transfer section so that an outside wall of each of the plurality of tubes and an inside wall of the heat transfer section define the closed chamber. Each of the tube chambers are in fluid communication with the enclosed combustion chamber.