Hy,
I want to run a Viessmann 111 B1LF on UFH without a external pump and low loss header.
The internal pump is Grunfos UPM3 15-75 so it is powerfull. I set up the pump from b2 config menu to 100% maximum upper limit. And the bypass valve it is set to maximum which mai be 2mca if I read it...
