Viessmann Vitodens 200-W B2HA heating issue

[kgfx_5]

Does the arrowed pipe supply the HW cylinder coil?.

I don’t think so… Not sure though. I think lower pipe (with 6M pump) is for supply.

 

[John.g]

When I follow it in your excellent video it turns left and might be entering the flow (top) of the cylinder coil, the pump is taking it from the coil return and pumping it through the boiler.