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A few questions regarding the pressure on an oil-fired boiler for a steam heat system in a single family house.

As always, Master Plumber, input from you and others on this forum is very appreciated

1) Am I correct that the gauge reading “internal syphon” measures the pressure in the system?

2) What should be the correct range of pressure showing on this gauge

3) If the pressure rises above this range, what does that indicate?

4) Does a reading of 4-5 present a danger?

Thanks in advance for your replies