'twoud be neat and simple though for one single little circuit - it seemed
a lot of effort to install a 4port mixer and an extra pump for one room.

Is a pump and TMV that much work to install? I suppose as time goes on, I
forget that these things could be a little intimidating if you haven't done
much plumbing before. I presume someone has packaged the lot into one box,
so you just connect the room up to 2 holes and the CH circuit up to the
others and apply electricity.

Christian.