| 摘要 |
<p>The central heating system has a heat storage and has more than one heating source. This system uses a solar energy collector or a heat pump and an electrical additional heater. The power of an economical heat source is utilised to ensure the min. use of additional heating. The heat storage (9) has a second water withdrawal point (4) below the first one and below the additional heating system (22). The second heat source (1, 4, 6) of the heat storage feeds heat below the secnd withdrawal point. Both withdrawal levels (13, 14) are connected by a mixing valve.</p> |
