Abstract: A heating appliance has a burner of the type having full premixing and forced draught and a mixing chamber to which an air supply line and a fuel supply are connected. The mixing chamber has a burner plate which is provided with apertures and which adjoins a combustion chamber in which a heat exchanger is disposed some distance from the burner plate and is passed through by the medium to be heated. A flue is connected to the combustion chamber. The effective heat transfer of the flue gases to the heat exchanger is varied depending on the load on the heating appliance.

Abstract: Regulating device for a central heating plant containing a hot water supply, comprising a boiler for heating a heating medium, a pipe for feeding the heating medium to space heating elements, a distribution device which is accommodated in the feed pipe and has a connection to a flow-through heat exchanger which is also connected to a return pipe from the space heating elements to the boiler. A pipe for tap water being provided in the flow-through heat exchanger and said flow-through heat exchanger being provided with a thermostat which operates the distribution device in order to change from circulation through the space heating elements to circulation through the flow-through heat exchanger and vice versa. The thermostat being adjustable to permit setting of the minimum temperature in the flow-through heat exchanger at which the distribution device switches over from space heating to circulation through the flow-through heat exchanger.