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Boiler is a Worcester Bosch Grenstar 18Ri... its only a 3 bed cottage, & small rads up and 5 larger rads downstairs. Pump is set to 3 at the moment but will try and rebalance on 2 and see if that makes any difference. Have already tried shutting all of the rads off apart from one of the...

Just changed the pump today. old one Grunfos UPS 15-50 130 New one DAB Evotron 60/130 Balance at closest rad upstairs to pump closed lockshield until just enough flow to heat the moved on to next nearest etc etc, I am guessing that even if not balance correctly, by shutting off ALL...

2 of the problem rads are 4 bar column rads 60cm x 79cm 5000btu. The other 2 bar, 180cm tall x 40 column 3200btu, and all pipework 15mm. One of the rads that is OK downstairs is also this size and heats OK

Since moving into a new house several months ago Im suffering from cold (cool) radiators in some of the downstairs rooms (3 out of 5 are problematic). Its a normal gravity fed system. This is what I have done so far: All rads changed for new. New TRV's and lockshields System flushed (but...

Thank you.... most appreciated!

Hi all, Bit of a long story.... but part of my investigation into cold radiators has led me to question the wiring for a normal Y plan gravity fed system...particularly the Boiler to pump. According to the WB wiring diagram it should be: Boiler Lp------- Pump Live Boiler Np-------Pump...