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      01-16-2013, 06:29 AM   #8
First Lieutenant

John320d's Avatar
Drives: BMW 320d E93
Join Date: Dec 2009
Location: Manchester UK

Posts: 355
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Further to my previous reply,some boilers do have modulating gas valves. Now you say that possibly 50% of your rads have no TRVs? It is also possible your boiler stat is out of sync. Try turning it down. Boiler flow temp. should be 80-85c.