Articular central heating boiler e.g. atmospheric gas boiler, has exhaust gas emission opening arranged in extension of gas flue and middle unit in close area of the opening, where unit has overflow opening for heating gases of another flue

摘要

The boiler has a middle unit inserted between end units and forming a combustion chamber and heating gas flues (5, 6) with heat exchanger surfaces. An exhaust gas emission opening is attached to a flue outlet and a seal is provided between the units. The opening is arranged in an extension of one of the gas flue and the middle unit in close area of the opening has an overflow opening for heating gases of the other flue.