I got my flow restrictor from devotedly discus but I think it is a john guest item, they cost pennies.
I bought the solenoid valve from local plumbers merchant, it is a normally closed 240volt designed for mains pressure, cost about £80. Normally closed is really good as in a power cut it snaps shut therefore no cold water in the tank when the heaters are off.
I bought the solenoid valve from local plumbers merchant, it is a normally closed 240volt designed for mains pressure, cost about £80. Normally closed is really good as in a power cut it snaps shut therefore no cold water in the tank when the heaters are off.