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luke warm water (central heating is ok)?

Hi Noticed today the hot water is luke warm but the central heating is ok - new boiler fitted in July 2010 (worcester-bosch Greenstar 37CDi) system pressure gauge was at 1 so increased it to 1.5 bars - have turned domestic hot water temperature to 4 and not noticed a difference in water Temperature - is there something I'm doing wrong :(
TonyW, December 2010
probably turning the tap on too much there's a big difference between the temperature of the inlet cold water in summer than in winter the boiler is designed to give a set flow rate to compansate for this if you turn the tap on too much the boiler can't cope with the increased flow rate and the colder inlet water temperature

brian, December 2010
link Click here to see other fixes for Worcester-Bosch Greenstar 37CDi.