Having looked at all your helpful posts recently and read as much as I can, I have drawn up a basic plan of how my CH should go. Please take a look at it and tell me if there is anything wrong with it or anything I should change?
Zone 1 is downstairs, Zone 2 is up.
I have a primary room (without TRV) in each zone.
I intend to use a pair of 'optimum start' (Honeywell CM61 or 67) controller in each primary room.
There is no room for a rad as well as a towel rail in the bathroom, but it has provided enough heat in the past.
The towel rail should take heat from any zone.
Of course, have a couple more simple questions, if may dare! :)
* Are the one way valves necessary? If so, are they in the right place?
* Am I right in putting the TRV's on the supply side?
Many thanks in advance.