I have a flowmax tank heated by grant oil fired boiler with mira showers .
A prv on main supply to house set at 3 bar . hot and cold water pressure at shower is 3 bar when heating is off .
Problem starts when water is hot and the house hot water taps are turned on and off ,the pressure at...
I have a flowmax tank heated by grant oil fired boiler with mira showers .
A prv on main supply to house set at 3 bar . hot and cold water pressure at shower is 3 bar when heating is off .
Problem starts when water is hot and the house hot water taps are turned on and off ,the pressure...