Why do bath fittings have 22mm fittings?

Question

would it be ok too fit a reducer onto a 22mm hot water bath tap ,down to 15mm to fit in between the 22mm hot water supply from tank to tap , or would this have any effect on the pressure output ?

Answer 1

Just means the bath takes longer to fill. Mines like this (comes off a combi- boiler) but otherwise no great difference. Bath taps/filler spouts are usually 22mm.

Answer 2

it will reduce the flow

Answer 3

This would decrease your pressure by about a third , I would recommend using a flexi adaptor if you are struggling, maybe it would decrease by about 10% then.

Maintenance mgr and plumber