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Water Level on Steam Heat Boiler Fluctates
Hi, I recently moved into a house with a gas-powered steam heat boiler. I've been told that I need to periodically add water to the boiler keeping the water level near the optimal water mark on the sight glass. My issue is: do I fill it to the line when the boiler is on or off? Earlier I went down to check on the water level and it was at the optimal mark (the boiler happened to be off). Then, an hour later was in the basement while the boiler was on and the water was way below the line, nearly at the bottom of the sight glass.
I'm worried that if I fill it while the boiler is on, it will put to much water into the system causing bigger issues. Any help on this is much appreciated! Like I said, this is a whole new system for me.