Abstract: A heat exchanger for use with a heat source for heating a vaporized liquid includes a housing composed of at least two essentially cuboid chambers that lie opposite one another and are connected to one another by at least one inclined pipe and has an arrangement for filling the housing with a vaporized liquid to an adjustable level. Preferably, a plurality of pipes are provided, which are arranged in vertically-extending planes, with the pipes of adjacent planes sloping in opposite directions.

Abstract: A hot air heat exchanger comprises a heat exchanger housing having a floor, which is essentially formed by a ceiling of an outer chamber and has at least one heat exchanger pipe extending from the floor to a ceiling element having exhaust openings, each pipe is secured to an exhaust opening in the upper wall of the outer chamber and a burner is disposed in an inner chamber which is positioned inside of the outer chamber with a spacing between the wall of the inner chamber and the outer chamber to allow air to flow therethrough. The upper wall of the inner chamber is provided with an exhaust gas opening, which is aligned with the exhaust opening of the outer chamber, and both openings have peripheral walls that are tapered to form a Venturi-like nozzle for drawing air in the space between the inner and outer chambers into each pipe as the exhaust gas from the burner in the inner chamber flows into the pipe to pass up through an exhaust element in the ceiling of the heat exchanger housing.