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Sight glass level drop after first heating cycle
Is it normal for the level in the sight glass to drop more after the first boiler cycle after a long shut down period , than after a similar heating cycle during the heating season when the boiler comes on regularly?
Could this be due to water in the radiators (mud legs I think they are called) just having evaporated and so holding back condensate till it reaches the outlets, or could it also or additionally be low or insufficiently sloped parts of the piping? I wonder about this because if I check the water level in the sight glass a day after shutting down for the season, and then again a week later, the water level has gotten higher.