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[oaky]

Are you seeing any visible steam from the vent tube?

I'm not sure if you mean while the circulator is making that sound or in general? In general, I believe there is a very small amount of water vapor, which I understand is normal. Otherwise, I never really paid attention or noticed excess steam  while the circulator is making this sound.

2840 has been staying within 3 degrees of set temp & no unusual sound from the circulator the last couple of days, winds have been fairly calm. Today, I believe they are suppose to pick up again, so I'm prepared to turn boiler set point down from 190 to 180 & throw in a light load of large pieces of firewood, seems to be the only answer.

[slimjim]

Unless you have an extended stack on the B-L, the wind should not effect it overheating.

[dukethebeagle]

mine does it when it get up near boiling.i don`t worry about it.just keep her closed up temp go down
all is good

[Crow]

 I haven't noticed any noises from the pump. I do not have an extended stack either. The power went out on Tuesday when we had high winds so I shut the blower and pump off in case a power surge happened and caused damage to them. Anyways, the power was off for 5 hours and when it came back on I turned the furnace back on and to my surprise the water temp was at my set temp. The BL does use more wood when it is windy.