We have a worcester combo boiler 28i junior - 2 yrs old just lately hot water from bath tap and the overhead shower runs hot at first but quickly turns luke warm. Tap in kitchen and ensuite sink - all fine and very hot. A few weeks ago noticed pressure gauge on boiler was low so we corrected this and played about with flow from the bath tap and seemed to be working but now doing these things don't make a difference. Any ideas?
