Wanting to install a new shower, I'm trying to understand water pressures...
My cold water is all direct from the mains (no tank). United utilities say they supply it with at least 7m static pressure. Does this mean it's at least 0.7 Bar, then?
Hot water is fed from a tank. I've a non-combi boiler that's pressurised, but that's just the heating circuit, I think. The hot water tank is in the cellar. I _think_ there's a header tank for it in the loft, though I've not actually heard it filling when the hot water is running (further tests tonight!).
(Is it possible that there's no header tank and the cylinder is fed directly from the mains? I don't think the hot water is pumped in any way - just the CH)
Assuming it is a loft tank, can I estimate the hot water pressure as being the distance from where my new shower head will be to the tank in the loft?
So, with a shower downstairs, and the tank in the loft in a high-ceiling house, that'll be something like 5 or 6 metres, meaning a pressure of about .5 or .6Bar?
Does the fact that the tank will be below the shower head make a difference? Will the 'resistance' of all the pipework make a big different to that 0.5Bar figure?
Or am I completely offside and misunderstanding?