Thanks for your response Sorrry should have added. Consider good flow from both.
Picture two rooms next to one another. Shower room, bathroom with shower (on suite) over shower room in attic is cold storage tank with hot water tank on floor level in shower room airing cupboard.
The next bathroom the shower is 3 paces around 3.6mt away from both tanks. The fall of water cold is good tested without the hose on. The hot for as long as I could stand it was also good. The head of cold is around 2.856mt to the shower head level its 1.20 approx. If this is inadequate and turns off the shower why when I removed the hose it continues with no interuption? if its the head surely the shower would not work at all or just trickle out of the spray head!
have run the bar without the hose for 10mins with no interuption adjusting temp to comfortable level.
Bob UK
December 2016