A daughter has move into a property with the following setup. All electric setup with mains pressure HW cylinder. Pic 1 shows normal 3bar relief valve. Pic 2 shows a 3.5 bar valve on the mains incoming and a 6 bar valve going to the expansion vessel. Pic 3 shows the stopcock which has me a bit bemused as to why the incoming water has a stopcock on it, as one would expect,but then a parallel set of pipes directly below?
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