| 摘要 |
The casing (1) containing the heating water has a flow connection (2) and return pipe (10). The low level combustion chamber (6) has gas-tubes (14) rising around the internal periphery of the casing into an upper collector (16). A water storage reservoir (15) is located above the combustion chamber, inside the ring of gas tubes. The flow pipe (2) is extended Vetically down (3) to the loer zone (4) of the water space (5) and has an outer tube (9) forming a sealed air jacket. A flow bypass (7) branched from the upper zone (4') of the water space connects into the flow connection (2'). The bypass (7) contains a thermostatic valve (8) which is adjustable to open at a pre-set temperature.
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