Draft Measurements

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Old 02-26-14, 01:55 PM
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Draft Measurements

This is for a gas-fired, natural-draft, hot-water boiler - physically large, with about 60 gal water volume. The manufacturer is long out of business, and no instructions are available. I am not experiencing any problems. Do these draft measurements sound reasonable?

Over fire, -0.01" W.C.

Flue from boiler, ahead of barometric damper, -0.025"

I can tweak the barometric damper to adjust the draft.
 

Last edited by gilmorrie; 02-26-14 at 03:18 PM.
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Old 02-26-14, 03:30 PM
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With gas I would think that as long as the pressure is negative but not 'roaring' up the pipe, you are OK.

What was the temp in the chimney like? warmed up pretty good? You might want to check when chimney is cold, because draft increases as chimney gets warm... wondering if you have less than -0.025 when cold? Maybe even a bit positive?
 
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Old 02-26-14, 03:42 PM
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The burner had been on for a few minutes before my measurements, I think. I'll try it again with a cold stack.

My wood-burning fireplace draft certainly is slightly positive, particularly with quite cold outdoor temp, for the first minute or two before the fire takes off. Its liner, like my boiler's, is vitrified fireclay.
 
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