| 摘要 |
A heating system comprises solar energy collectors (9, 10, 11, 12), a first, air/liquid, heat pump (13), a second liquid/liquid, heat pump (1) arranged to receive heat energy from the solar collectors or the first heat pump at a first temperature, and a liquid storage tank (19). The liquid storage tank is coupled to the second heat pump so that liquid contained in the tank receives the heat energy at a second temperature which is higher than the first temperature. <IMAGE>
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