Selgas
nitzia
If you have got “Steam” in the cylinder I think you will find that the problem is a hell of a lot more than what you have suggested – there is NO WAY steam should be able to accumulate in a mains pressure storage water heater when it has a TPR Valve fitted to it which will blow full open and discharge the hot water as well as relasing the pressure when the hot water at the top of the tank reaches 98 dgrees C – which is of course 2 degrees below boiling point.
I also beleive you will find that the person asking the questions is based in Australia going from the brand of the water tank they have stated in their posting and our rules for Mains Pressure systems are a little different to those in the great US of A.
