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      01-16-2013, 03:36 AM   #3
coopersim
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Drives: VW Lupo
Join Date: Apr 2009
Location: Berks

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Sounds like kettling where the water in the boiler boils, have you got thermostatic radiator valves? Are they all 'satisified' (as in closed due to there being enough heat) Do you have any radiators without TRVs?