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TGR-
That could happen in that case, but reading into what the OP wrote its as if he runs one and it runs hot cold hot cold and not both at the same time. Gotta mind that you'll only get X amount l hot our your combi at once and if you have something that has multiple draw offs at one time you need a tank.
konastab01
I can tell you from workinb on them, that’s not right. It should be cold then stay hot for as long as the tap is open.
Shouldn’t go cold hot cold hot.