| 摘要 |
A system for heating two independent water supplies having a water storage tank adapted to contain a first, potable water supply and a coiled heat exchange tube mounted within the tank to contain and conduct a second, non-potable water supply. The tank has a top, bottom, wall, and flue communicating between the top and bottom. The tube is in communication with the exterior of the tank and with a circulatory space heating system. The tube has a double wall to protect against the mixing of the potable and non-potable water supplies, and the ends of the tube terminate at the surface of the water storage tank at a dielectric fitting which maintains electrical isolation between dissimilar metals otherwise exposed to the water.
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