bengasman - I have discovered I live in "the house that jack built" but I have to live with it and make the necessary changes so probably the whole thing is wrong but I need to try and fix it. If I put on the upstairs circuit only ( 6 rads ) it is still slow but gets there eventually. When the system gets up to speed say after 1 hour all the rads are very hot it just takes forever
I am afraid it is not so much a matter of the pump not being strong enough, but an utterly botched up design. 6 rads should get piping hot with a 15/50 pump on setting one in 10 minutes flat.
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