Decided against two pumps - one for each shower. Instead looking to install one 3 bar pump to power both. On the hot a cold outlets do I split each so the two pipes become four - hot and cold for each location? 22mm pipe has ben suggested - is that still ok if splitting each outlet to supply two separate showers. Normally only 1 shower in use - I was worried about cyclinder emptying fast with two pumps at 3 bar pressure - will 1.5 each (*ie one pump between both showers if both in use) be powerful enough?many thanks. D