Abstract: The invention relates to a method and a device for the generation of hot air. According to the invention hot gases are generated in a heating space (1), and water is added to these gases so that it is evaporated and mixed with the gases. In order to provide a complete mixing and good heating properties, the hot gases are passed from the heating space (1) into a whirl chamber (2) in which the gases are brought into a whirling movement. Water is fed into the whirl chamber (2) essentially adjacent the central shaft (10) of the chamber so that the water is mechanically mixed with the hot gases when it is displaced to the periphery of the chamber by the action of the whirling movement of the gases and is evaporated by means of the heat energy contained in the hot gases. The mixture of the hot gases and the evaporated water is discharged from the whirl chamber (2) essentially at a point adjacent the central shaft (10) of the chamber at the opposite side of the chamber with rspect to the water supply point.

Abstract: A control system for central heating is disclosed which varies the flow rate of the heating medium as a function of remotely sensed outdoor temperature. A power transistor, which is part of the electronic control circuit, also functions as a heat source for a measuring bulb which controls the position of a flow rate control valve.