Hi.

I'm making a new thread because the other one was getting pushed down
the list and lost in the background, and it has raised some new
questions for me.

I have now decided to zone; 2 zones, 1 upstairs and one down. Many
thanks to the posters who have given advice. The house is too small
and tight to put more pipework in than this. Now my remaining
questions are...

1. Can I use a common return? (There was an answer in the previous
thread but it made no sense to me.) If zone 1 is operating and zone 2
isn't, can there be a problem with using common returns?

2. Can you reccomend a RELIABLE valve to use for just two zones?

3. What about 'primary' rooms and rads without TRV's? As I understand
it, the rad in the primary room (the room with the controls in, yes?
Thats the open plan lounge in my house) should have no TRV. Do I need
a primary room in each zone? What if the controls are in the upstairs
hall which has no rad?

4. Websites? General CH design as well as zoneing.

Again, thanks. It's help from people like you that makes my home
better!