Going back to my shower pump query if i fit a shower pump to my gravity fed system will i have to have a seperate pull switch in the bathroom to turn it on every time i want a shower or will the action of the water trigger it? Also what does closed head system mean?
Only thing i know about closed head is a "Differential By-pass Valve", which automatically stabilises circulation flow rate in pumped heating systems when a thermostatic radiator or zone valves closes, thus protecting from pumping against a closed head.
Nothing in relation to domestic plumbing and heating (the term is used with sprinkler systems). Perhaps you mean pressurised or unvented hot water systems?
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