this is a bit long winded but bear with me. I was planning to plumb a manual mixer shower in by running pipe from hwc to the hot and teeing off the cold bath tap, but after looking in airing cupboard there was absolutely no room to do anything, so i thought there seems like enough pressure at the hot tap so i will tee off that. how wrong i was. so i have acquired a pump one in one out, my question is, is it ok to put pump in a position where it will be before the tee off point so when pump is running it will be pumping for shower and bath tap. grateful for any advice