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I have just fitted a DT90E thermostat to me system replacing a T6360B. All is well, with the wiring as it had four wires bit I removed the earth and neutral to install the DT90E so only have live and switched live now. My problem is that even though the timer I see off, I can turn on the heating...

I need to fit a pump for my shower, it is on the same level as my hot water tank but is supplied via 15mm pipe approx 11 metres run (this is all this pipe supplies). Cold water is off the cw tank and approx 8 metres from pump also 15mm pipe. Is this ok, I have read pumps need 22mm pipe supply...