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- 27 Jan 2008
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Just had an extension done with a new condensor Worcester 24Ri boiler put in, as well as a further 6 radiators using 10mm plastic piping. Most have TRVs. (The existing 7 radiators were connected using 22mm/15mm copper piping). The existing pump is a Grundfos 15-50. The furthest two new radiators are 2m high designer radiators and they are only luke warm. The plumber says that we need a bigger pump. Do we really?