When the boiler was replaced a couple of years ago the fitter, who now works for Gas Safe as an inspector I understand, did not think it necessary to change from the existing open vented system. Maybe he thought the old pipe work joints could not cope with the additional pressure.
I see that I...
Thanks for the reply.
The boiler is 20 KW output and turned almost fully on, and the rads total is 20021W using the Stelrad table you referred to.
The hall rad (biggest in the house) valves are fully open and is the only one with no thermostatic valve (to satisfy the rule that there must...
My house has a gravity fed pumped CH newish gas boiler with motorised valve in cellar with 3 floors above, HW tank on 1st floor. CH header tank is only slightly higher than top of the highest radiator on 2nd (top) floor.
House has 13 radiators across the three floors, and all get nice and hot...