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Wow guys, Thanks for all of this - there are a few things here which I had not tried or considered so here's a few more bits of information: 1. If I switch off all the first floor rads the ground floor floor rads get marginally warmer - but I mean - the difference between lukewarm and...

Thanks Namsag, There are 15mm that come from and return to two long runs of 22mm in the ceiling void (presumably to and from the boiler ?) and this 15mm then goes to somewhere just above each radiator downstairs - the 15mm then is reduced to the 8mm microbore that goes down the walls to the...

Thanks Kirkgas, I have had many people look at it over the years, without success, in fairness I think everyone thought it was a 'proper' microbore installation from a manifold but this appears to be not the case. Its a hybrid ! I think the basic design is flawed - the house is about 20m...

I have a 5 bed, 3 bath Bovis built house 23 years old, we have lived here since new. The central heating system has been poor from Day 1 almost - it has a Potterton Netaheat Electronic 16/22 boiler which has run like clockwork with virtually no repairs needed over the entire time we have lived...