its about combi boilers in general. this is wot i think i know. with a combi boiler you dont have a cwsc or hwc, so im guessing the cold taps are mains fed and teed off to combi for hot water. if this is right where do i get my feeds for hot and cold if i want to plumb in a manual mixer shower, bearing in mind i was always told the hot and cold should be of equal pressure.