Must be in the air. One of the absolute worst installations I've ever seen. Not that an upside down pressure gauge effects (now I'm guessing on the right use of effect/affect - thanks [:-weepn] ) anything but it just shows a total lack of knowledge/care. No low water cutoff, no pressure reducing feed water valve, 14' run of pipe with no support, no insulation, not a plumb pipe in the entire installation - a real hack job. Needless to say I was not kind. Click to Enlarge 43 KB Click to Enlarge 33.42 KB Oh yea, forgot to mention - they had the "plumber" come back to fix a leak on the boiler. Seems the t/p relief valve was leaking. He said it was a faulty valve and replaced it. The pressure of the boiler was pushing 30# at room temperature. Go figure.