Vaillant Energy Integral (Compr start heat from)

[Andre_K (André Kühne)]

@Xtopher

Doesn’t look like the myVaillant integration in HA has target flow temp or integral data (not surprising).

It has flow temperature as measured by Vaillant, also the heating curve parameter and outdoor temperature. I posted an equation that will calculate target flow temperature based on heating curve and outdoor temperature here, so you can calculate the current target temperature yourself in HA:

Vaillant Arotherm Owners Thread

I might be misunderstanding the curve calculations but I think there’s a mistake in Vaillants example and hence in your calculations in the first post. The figure you posted and your tables claims that for a setpoint room temperature of 21°C, all flow temperatures get shifted by 5°C compared to 20°C setpoint. That value is too large. I think Vaillant just picked that example to have a nice round number (45°C) in their manual. The 45 degree angle parallel shift of the curve actually leads to a …