I’ve set my system to run with pump speed 3, mainly to reduce the noise that could be heard around the house, but also to increase the dT from 2 to 5 C. The flow rate measures around 12 l/min, which is technically below the 14 l/min minimum in the spec, but I have doubts that the Sika can measure glycol mix properly. (Heat meter suggests it’s closer to 15 l/min)
I wonder about adjusting the heating circuit pump speed as well so as to balance the LLH, but it sounds like a faff for 10%.
It is indeed a fixed speed, though the manual for FTC6 mentions something called “Water flow control” under Operational settings. I’m not brave enough to try it…
