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The non return valve prevents the pressure dropping in the HWS and thus keeping the pressure switch in open circuit.

Holty The whole purpose of my adaptation is to reduce the pressure in the coil when the hw taps are shut off. an ordinary solenoid valve would have cut off the mains pressure to the coil but it would also reduce the flow rate. By using a pilot operated solenoid it allowed full bore...

I have an Albion Mainsflow cylinder fitted for about three years and has recently developed a leak internally from the mains pressure coil int the static heatstore. I tried in vain to apply the warranty with the makers. The fault allowed about five litres of water to be discharged through...