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reasons for balancing rads

Hi any of you good engineers familiar with unvented solid fuel boiler for heating only, have been advised 50/50 on installation even though all safty measures are inplace inclueding two pressure/heat release valves automatic fill and 12 litre expansion vessel auto air vents...

Hi i have a problem with ferrolli condensing combi, topping up every couple of days no leaks any were, is it possible diverter valve leaking through when hot water to taps are running, ther is no signs of water from presure reliese and all rads bled properly. presure gauge reads...