Out of the 8 rads, the only 1 that gets reasonably hot is the 1 in the hallway, 2/3 of the others get luke warm but not hot.....the rest just stay cold. This happens if we have both the HW and CH on or just the CH. The boiler does stop and start, ive noticed it gets up to about 75c on the display but then drops back down to about 35c and then will start to go up again......this seems to happen all the time the CH is on.
I will post a list of all the sizes of the rads and look at the values you mentioned when I get home.
I will post a list of all the sizes of the rads and look at the values you mentioned when I get home.