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oh i see, some just use the microswitch on top and some use a switch on top and a separate flow switch for the hot water. my boiler is about 8-10 years old. just trying to learn how it operates.

yes that looks correct - make sure the offset before the tee is a min of 450mm though, or you will lose heat straight up the vent . try and make sure the vent pipe is as straight a run as possible (if space). but should be fine that way. the flange for the shower is fine... did you buy a...

valiant make. what's the point of a flow switch as well as the diverter valve with microswitch on top then....

450mm min offset from top of the hot water cylinder, then should run horizontally (with a slight rise) - then a tee, up to the vent and downards to the ground, before running off to the hot water taps (draw offs).

Combi boiler diverter valve - when hot water is on (tap opened) the diaphragm should deflect and move a spindle which makes contact with a micro switch - thus letting the primary hot water (from the primary HE) heat the domestic hot water instead (ia the secondary/plate HE) ... right? but...