Mike Lamb Posted January 31, 2018 Report Share Posted January 31, 2018 What does an internal siphon gauge on a steam boiler do and is zero and optimal reading? Link to comment Share on other sites More sharing options...
Bill Kibbel Posted January 31, 2018 Report Share Posted January 31, 2018 It supposed to measure the pressure in a steam boiler, but that type of gauge is usually worthless on low-pressure residential boilers. Code requires boilers to be supplied with gauges that measure 0-30 PSI. The 0 to -30 is there because some steam systems are set up to operate as vapor/vacuum systems. It would be much better to install a gauge that measures ounces to a few pounds as most residential steam heating boilers should operate at less than 1 PSI. Link to comment Share on other sites More sharing options...
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