Heating monitor MED-HM-1

The annual costs for gas or oil are considerable, yet no heating system provides a transparent display of all relevant operating temperatures. The approach always seems to be: “As long as it’s warm, that’s all that matters.” Not to mention that the operating temperatures of the often-existing solar thermal system are rarely taken into account. During the transitional periods from March through October / early November, hot water production is very stable due to the high levels of solar radiation. At the same time, space heating is still required to some extent until early May. The heat demand during this period is not comparable to the situation in the winter months.

I have now developed a MED-HM-1 control unit that uses eight external NTC temperature sensors to monitor all operating temperatures of the solar thermal system and the heating system. The data is visualized on a 4-inch TFT display with touch control, from which the unit derives valve control to support the heating system whenever the hot-water temperature is sufficiently high.