| 摘要 |
The circulation system for hot utility water is equipped with the first-degree water heat exchanger and the second-degree heat exchanger for heating water, connected with a conduit of hot utility water. The first-degree heat exchanger is connected to a cold water conduit through a non-return valve to the water grid. The second-degree heat exchanger is connected to the central heating node and to the hot-water distribution network. The circulation conduit of the latter is equipped with a circulating pump and a non-return valve. It is characterised in that the circulation conduit (11) is connected to the installation of hot utility water before the first-degree heat exchanger (11) for heating water.
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