Importance

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Abstract

A boiler for heating a heat-transfer medium, such as water in a domestic heating system with water-carried heat. The boiler comprises a tank (2) for the radiator water; a combustion chamber (3); combustion-gas pipes (4) which extend down through the tank and which discharge at the bottom thereof in a collecting chamber (5) for combustion gases. At the upper part of the tank (2) there is arranged an outlet (7) to the radiators, while a tank-inlet (8) from the radiators is arranged at the lower part of the tank. Also arranged in the tank (2) is a reservoir (17,20) for heating tap water, whereat the reservoir-inlet (10) for tap water is connected to a fresh cold-water pipe and is located at a level which lies beneath that of the tank inlet (8) from the radiators. The tap water reservoir has a lower part (20) which is located beneath the combustion chamber in the tank, this part of the reservoir having a branch point (11) from which a first branch pipe (12) passes outside the tank to a mixer valve (13) and is arranged to supply pre-heated tap water thereto, and from which a second branch pipe (14) passes to the mixer valve (13) via an upper part (17) of the tap water reservoir lying above the combustion chamber (3), and is arranged to supply to the mixer valve tap water having a higher temperature than that of the tap water supplied by said first branch pipe (12).

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First Claim