| 摘要 |
A boiler for producing hot water comprises a tank for the heating of water, an electrical heating means 12 for the tank, a hot water outlet pipe (10) from the upper part of the tank, a pump (17) a return pipe (11) opening into the lower part of the tank, a regulation valve (20) connected to a regulation circuit including a means (221) for measuring the external temperature and a temperature probe (22) connected to the return pipe, whereby the valve (20) introduces water from the return pipe (11) into the water outlet pipe (10) in dependance on the temperature of the returning water and taking into account the external temperature, the boiler being characterised in that the upper part of the tank includes a volume of gas (29), a sleeve (28) being fixed in an airtight manner, in the upper part of the tank, by its upper edge, its lower edge being immersed in the water of the tank. A layer (30) of a liquid immiscible with water floats on the surface of the water in the tank. Turbulence in the tank is prevented by an outlet chamber (31) at the lower end of pipe (11), having outlets at its periphery (32) and in its lower face (33). <IMAGE>
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