DavyJones, Re point no 2 - how good a system is this if you have a couple of bog standard gravity fed showers with fe*k all pressure but where the pipes would be a nightnare to locate individually and pump individually. If the whole system is pumped, what are pros and cons. Eg, would it affect the toilet cisterns - would the pressure be too much for ordinary ball cock? Want to pressurise my showers without ripping out walls to install pumped shower etc so looking for handiest most cost effective options and thought sticking pump on hot and cold feeds might be the answer??