| 摘要 |
Incoming water passes through the primary circuit of a heat exchanger 2 into a storage vessel 4 having means for heating the water therein. Hot water is drawn off from the vessel as required and passes to waste after use, and the path to waste incorporates a pump arrangement 8 for diverting waste water to a thermally insulated reservoir 9. Water passes from the reservoir 9 through a secondary circuit 10 of the heat exchanger, such that heat energy in the water passing to waste can be transferred to the incoming water. A pumped recirculation path 3, 12 exists between the storage vessel 4 and the primary circuit of the heat exchanger 2. |
