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Still losing 2 gallons of water on each test.
Each day we bring water up to correct level.
Turn boiler on early , let run for 4 hours, then turn it off.
24 hours later we are missing 2 gallons of water.
Good heat very fast, 12 cast iron radiators , 100 years old.
We installed a used Burnham steam boiler 142,000 btu, natural gas.
All new 24 volt assesories.
No banging noise.
Checked everywhere for leaks.
Did as you suggested, overfilled boiler when cold,
Let set 24 hours, no leaks in boiler . No water anywhere on cast iron when overfilled and cold.
When boiler is hot we check exhaust for steam, none in exhaust , none coming out chimney.
Checked all returns for leaks.
All air vents are new , 2 main steam vents are new.
Can find no steam or water leaks.
System works great other than losing water.
Is this a lot of water to lose in such a short time?
Historic house in Kingston NY