EDLA11 started to modulate its heat output

The target flow temperature is higher on the right hand side, which means the emitter output will be higher, and the heat pump can keep running close to the target. When the target is too low, the emitters can’t keep up, forcing the heatpump to cycle.

You might find the minimum flow temperature for your system is around 35°.
See Calculating the optimal weather compensation curve for my topic on this.

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