Dual gas and solid fuel heating boiler - has separate flues for cascade linked combustion chambers of independently optimal sizes

摘要

Combustion chambers for gas and for solid fuels respectively have connections for water conveyance, and flues for chimney attachments, in a boiler assembly for heating. Each of the two chambers (2,3) is of optimal dimensions with regard to output demanded, independently of each other and with its own boiler water enclosing space. These spaces are circuited in cascade fashion, regardless of the prevailing chambers operational state. The flues for the chambers are separated, and carried over to flue pipe sockets of different cross-sections.