Abstract: The present invention provides a boiler system, for example for use in heating a domestic hot water supply, and which is significantly more fuel efficient than existing boilers, the boiler system comprising a first reservoir and a second reservoir which together define a combustion enclosure, a storage tank positioned to define an upper wall or roof of the enclosure and being in fluid communication with the first water reservoir, a heat exchange tube located in the storage tank and being in fluid communication with the second water reservoir; and a burner arranged to directly heat atmospheric gases within the enclosure in order to indirectly heat the walls of the enclosure.

Abstract: A separable combinaton boiler comprising:a boiler body consisting of at least two horizontally aligned cylindrical boiler units each of which has in each end wall a central opening and a gas port above the central opening for the passage of combustion gases, and a front cover plate and a rear cover plate which are laid over the central opening in the front end wall of the foremost boiler unit and the central opening in the rear end wall of the rearmost boiler unit respectively, said boiler units and front and rear cover plates being separably joined together by fastening means provided thereon;a heat exchanger contained within said boiler body and divided by said boiler units into an equal number of heat exchanging elements which are interconnected by tubes to allow an uninterrupted flow of heat-transfer medium therethrough;a burner mounted on said front cover plate with its flame spout extending through a central opening in the front cover plate and the central opening in the front end wall of the foremost b

Abstract: Boilers with horizontal boiler sections contain in each section several heat exchanger elements for transferring the heat from the heating medium to the heat carrier medium. They have the inherent advantage of needing a connection between sections only on one side so that the dimensional changes during operations are easily equalized and no thermal stresses occur. Heretofore, it has been assumed that the frame of such horizontal boiler sections in which the heat exchanger elements in the form of pipes are secured must be provided with a cooling channel for the liquid heat carrier medium, and consequently the specific heat output in relation to the amount of material used for the construction of the boiler section was considerably decreased.The boilers with horizontal sections in accordance with the invention overcome this problem and require only a reduced specific amount of material as compared with the known boilers of this type.