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Posted by jtown on January 19, 2004 at 18:57:14:
In Reply to: Steam pressure gauge posted by george on January 19, 2004 at 17:52:42:
Whatever your local shop sells for a Pressure Guage. A 0-15psi would be good, though 0-30 are more common to get. Yours may be a "Compound Gauge" that shows vacuum also for when the system's vents close and the condensing steam creates a vacuum measured in inches of Mercury(Hg). A "Retard" guage will have 0-5psi or so in a wide scale and then 5-30 in a narrow band so you can read the low pressures or vacuums. To see if your system is going into a vacuum, lift the pressure guage and air will get sucked in, or try to blow down the boiler and no water will come out. The key thing is to monitor for pressure getting way too high. A common cheaper guage will do.