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Water dripping off the water heater vent pipe

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Is water occasional dripping off the vent pipe from a gas water heater normal?
asked in Gas Water Heater by dmeyer1 (120 points)
edited by darekrudy
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1 Answer

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Hi Dmeyer1
Unfortunately not, water dripping from the water heater's vent pipe is not normal, might be a result of a few conditions, and some of them could create hazardous situation.
  1. Might be as simple as missing chimney rain cap – if that occasional dripping water is associated with a rainfall. It could result in corrosion of the vent pipe connector, create holes in its walls, and cause Carbon Monoxide spillage into your home.
  2. Oversized chimney flue – water heater gasses temperature heats up the chimney and creates a draft that removes exhaust to exterior. If the chimney flue / liner is oversized, the exhaust gases don’t have enough energy to travel all the way up and instead they condensate on its walls / you get water dripping, possible corrosion, and CO spillage into the house may occur as well.
  3. Undersized and / or obstructed chimney may result in condensation and Carbon Monoxide spillage as well.
  4. Single wall vent pipe installed in some unheated space (attic, crawlspace, garage, etc.) in a cold weather might be responsible for condensation, results same as above.
  5. Negative air pressure in your house (air tight home) could result in back-drafting, condensation buildup, and CO spillage.
Something to start from… let me know if there is anything else I can help you with, just click “comment” below.
answered by darekrudy (21,730 points)