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At least it does not seem to be working to me. My one pipe steam system runs nicely at 1.5-2oz of pressure. However when it runs from a large set back, say 4-5 degrees the pressure starts to climb and the rads start to hiss. This happens at about 3oz and up. I have fiddled with the vaporstat but nothing seems to shut of the boiler until the tsat is satisfied.