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Understanding Boiler Pressure | Boiler

In the early 1900s as boiler codes and rules were being established it was decided that a high pressure boiler would be 15 PSI and above with anything lower being defined as a low pressure boiler. The industry has maintained this standard for over a hundred years and boiler regulations and standards have been built around it.

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What Your Boiler Pressure Should Be When Its Heated ...

Dec 30 2019 · In any event the usual cold pressure of a boiler should sit at about 12psi (pounds per square inch). Most pressure gauges display different-colored zones. If the needle sits much outside the green zone particularly on the high side you have a problem. Pressure Change Range. Pressure will change when the unit fires up the heat.

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