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  • From electric to water.

    Why would a water tank, used as water storage for hot water activate the overflow. There is an expansion vessel which has air in it. There is alot of limescale so was thinking maybe change the valve as the valve may not seat anymore due to limescale. Then re inflate the pressure vessel to see if it holds.

    What would you do?

  • If it's a pressurised expansion vessel then the diaphragm has likely failed. It's a closed system? No tank in the loft?

    You'll need a new expansion Vessel, you can't replace any internal parts.

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