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hi brumylad,cheers for that mate.tried your theory regarding closing valves to no avail.the problem has always exisited,not got worse.22mm at least 3m away from boiler.boiler working normally no cutting out too early as pipe thermometer shows,cheers rich

hi jpc thanks for your input,no sludge in rads they have been off and flushed.what happens if you over pump,cheers,richard

hi anybody.i have sealed system, conventional boiler(60,000btus),4 large double rads(high output),3 single,standard cylinder.i currently have a 5 metre head pump.2 downstairs rads only warm a little when the water is on as well.water also takes quite a bit longer to heat.will fitting a 6m head...