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WhatdoIknow, you are quite right. It just so happened (rather than was caused by) that by the time he'd fitted the larger pipe the standing pressure was 28. Must be a local pressure variation or something. My mistake. Anyway, despite the bigger pipe and the increased pressure the test only...

It is 20 mbar. rob884 what do you mean by 'fixed it'? Can one persuade Transco or whoever to measure the pressure at the meter with a 4.4m3/h flow which is the boiler's max? I realise standing pressure of 20 mbar are possible with a pinhole feed. Thanks

My Corgi registered fitter has just fitted a Worcester 42CDI Combi boiler. I have just read through a thread from last August where ideas were put forward but the original poster disappeared while the thread disintegrated into internal argument. Anyway, this is the problem :- 1. The...