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Garage water heater installation, CO alarm activation

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The water heater is in a 3 car enclosed garage. it sits in the back corner against the home.  It is open to the attic and about 18" off the ground. The attic does have a couple of openings in it.  the closet door I used a hollow door and drilled three rows of 1/4 inch holes at the bottom and top.  I did find that the vent pipe had come loose at the stack that is mounted on the water heater top.  I put some tape on the for now.  I read that in the garage you are not supposed to use single wall pipe? and could this small gap have set off the co detector inside the house?  it is located just on the other side of the wall from the water heater?
asked in Gas Water Heater by 08two367 (120 points)
edited by darekrudy
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1 Answer

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There are several problems with your installation and I would suggest reading a couple of my posts:
  1. http://checkthishouse.com/5712/garage-gas-hot-water-heater-raised-above-the-floor-fvir-safety.html 
  2. http://checkthishouse.com/744/garage-fire-wall-separation-wall.html 
  3. http://checkthishouse.com/6236/combustion-air-requirements-for-fossil-fuel-burning-appliances.html 
  4. http://checkthishouse.com/49/water-heater-vent-pipe.html 
  • “open to the attic” – this is a fire hazard – second link above
  • Three rows of ¼” holes along the top and bottom of the doors is not enough to provide sufficient amount of combustion air (third link above)
  • Single wall vent pipe is not permitted in a garage / should be double wall, vent pipe / connector should be secured to draft hood (if this is what you call “stack”) with screws / not tape (link # 4)
  • I’m not sure what do you mean by “small gap”, are there any openings between the closet and your house / living space?
  • Are there any other gas, oil, or other fossil fuel burning appliances inside the house that could activate your CO alarm?
You should have all the answers after reading my articles listed above. If something is still not clear, please let me know.
answered by darekrudy (21,730 points)