now got a problem with my shower after having the above boiler installed. before getting boiler installed i checked with shower manufacturer to make sure it could be used with a combi boiler, they and the boiler installers said this would be ok as long as it is " balanced correctly" whatever that means. Shower has never really been right, seem to have trouble getting any hot water through it, the hot water does come but then goes cold again for long periods of time. Does anyone have any idea what may be wrong.Should I be calling out the company who installed the boiler? Any info would be gratefully received.