| 摘要 |
<p>Heating apparatus with a boiler 1 which is connected to a heater arrangement 9 by means of a forward-flow and return-flow line 2, 3, 7, 8 provided with a pump 10 and with a four-way mixing valve 7. In order largely to avoid operation at low boiler inlet temperatures, a boiler circuit pump 5 controlled by a control device 6 is provided. <IMAGE></p> |
