Great meeting!
never over kill, although you can make a case for a fixed mixer in some circumstances I guess. i.e. a bathroom or a small area where you know the flow is not going to rob from the other circuits (assuming its not post header)
I think he means vent pipe…I don’t think the OP (original poster) is talking about CCTS as we talk about them for hydraulic separation
may be… but we should add the 400 series from vaillant
HMM WITH THEIR ADD ON CONTROLS SOLD OUTSIDE THE UK…YES PRETTY GOOD