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Old 07-05-2012, 08:10 PM   #16
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Hot water tank flue has hot exhaust coming out


so it is a staic flue pipe connected to the top of the heater where the pipes connect and you feel heat rolling out when the window is closed...it is not drafting as heat rises out of the heater during a cycle..lighting a match and see if it trails up there at the opening of th flue pipe hat even the smoke should vent up on or off...should always be a draft there.... does it go into a firplace riser and out or just the furnace and the HWH?

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Old 07-05-2012, 09:29 PM   #17
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Hot water tank flue has hot exhaust coming out


Thanks, Mike for helping us by moving this to the HVAC forum. We live in Illinois, I see you are in Kane County, we are in DuPage County. This issue has only happened twice in a year's time. Hubby has mechanical abilities, maintenance as his job vocation, so can usually figure out what the problem is and how to solve it. This one is stumping him, he does think it's an air pressure issue as you said here, but, how to solve the problem now? We had power outage, had to spend alot of money here on appliances to survice 3 days without power in the horrid heat, so we don't have alot of money to pay for an "energy auditor" that was suggested, etc.
I hope we can get this solved finally so it's not an issue. We cannot keep our laundry room window open in this heat! Doesn't work...!
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Old 07-05-2012, 09:54 PM   #18
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Hot water tank flue has hot exhaust coming out


With a window open 4 feet from the hot water tank and window open near the portable a/c unit that's in an attached room it seems to have balanced it and the problem isn't there. But it's hard to leave windows open when we have had outside air temps of 104.

Both the hot water tank and the a/c furnace unit share a common flue. the hot water is vented with a 3" vent pipe in to a Y with a 5" pipe that goes into a 6" for the flue. The chimney is open. I check it.

I talked with the heating contractor we use and he mentioned that with such high outside air temps the flue will have a problem venting because the temp in the flue is close to the temp of the burnt gasses.

The hot water tank is safe for now but I don't want to leave windows open. i need to come up with an alternative way to get air to the portable unit to stop the negative air throughout the house.
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Old 07-06-2012, 09:28 AM   #19
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Hot water tank flue has hot exhaust coming out


if you can add a dryer vent outside and leed in with a piece of flue pipe between the furnace and the hwh.that no rise during the hotter days is an opinion and thats all.you can put your hand on a flue pipe when either is burning....the room is starving for air...the window oen is proving that.you need to add a perminant source of air.maybe a louvered grill up on the wall in that room...
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Old 07-06-2012, 10:50 AM   #20
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Hot water tank flue has hot exhaust coming out


Is the hot water tank and furnace/AC in a closed room?
Where does the furnace/AC draw it's air from?

Can you post some photos of the set up?
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Old 07-06-2012, 10:52 AM   #21
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Hot water tank flue has hot exhaust coming out


The grill is a good idea. are you talking a direct connection to the flue pipe or just a way to get air into the room? There already is a washer and dryer in there. Opening the two adjoining doors to the utility room and with the window closed, doesn't seem to solve the problem. I need a source of outside air. Plus we are expecting 100 degree plus temps again today. Thanks.
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Old 07-06-2012, 10:56 AM   #22
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Hot water tank flue has hot exhaust coming out


The room is an 8'x8' utility room. One door leads to the hallway to bedrooms and has a return for the furnace/ ac. the other louvered door leads into the kitchen. 25 feet away is the family room where we have a 12,000 btu portable a/c unit that is pulling the air from the flue. I need to find a source of outside air other than open windows.
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Old 07-06-2012, 04:28 PM   #23
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Hot water tank flue has hot exhaust coming out


The most common causes I run across for HWT spillage are.

There is not sufficient combustion air available for the chimney to operate properly.. A fresh air supply to the appliance room from outside is the best solution.

Negative air pressure in the home from a competing fan, clothes dryer a or another large chimney. A fresh air supply to the HW tank room will fix this.

A chimney obstruction, insufficient vent rise , undersized vent, HWT is too far from the chimney, chimney clean out door is open, or sometimes if the outside temp gets really hot there just isn't enough of a temp. differential for the chimney to operate effectively with a small appliance.

This spillage means CO in your home!!!
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Old 07-06-2012, 05:20 PM   #24
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Hot water tank flue has hot exhaust coming out


Thanks HOW. The hot water tank is off and we run it only when necessary with proper venting.

Right now it is 104 degrees outside. The possibility of the temp difference between the flue on the roof and the burned gas temp being too close is a real possibility. Tomorrow predictions are that the temps will be around 95 and then dropping into the 70's by the weekend. Until then we'll just take precautions against CO gas and see how it is then. Thanks again.
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Old 07-06-2012, 06:27 PM   #25
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Hot water tank flue has hot exhaust coming out


Lynnie, does that portable AC unit vent to the outside? If so that's your negative pressure.
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Old 07-06-2012, 06:51 PM   #26
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it vents through a 4" flexible pipe through a window about 25' away from the utility room and the furnace, a/c hot water tank. when the portable unit is off the backflow isn't noticable.
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Old 07-06-2012, 07:10 PM   #27
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Hot water tank flue has hot exhaust coming out


sheet metal rain cap and a short piece of pipe thru the wall not connected to nothing.the only test will be to install it a shut the window
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Old 07-06-2012, 09:50 PM   #28
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Hot water tank flue has hot exhaust coming out


Quote:
Originally Posted by Lynnie59 View Post
it vents through a 4" flexible pipe through a window about 25' away from the utility room and the furnace, a/c hot water tank. when the portable unit is off the backflow isn't noticable.
That's it then. The portable is taking the whole house into a negative pressure so the air is trying to get back in via the flue. Turn the water heater off when using the portable AC or leave a window open a bit.
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Old 07-06-2012, 10:01 PM   #29
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Hot water tank flue has hot exhaust coming out


Houses are built so tightly that make up air is a necessity. Some of the portable air conditioners have 2 ducts which take care of the make up air issue. Hmm...years ago this wouldn't have happened because of window leaks, lack of insulation...etc....etc. Anything that can be done to allow combustion air will help. I can't see turning off the water heater just to run an air conditioner.....better solutions are available. (and there is always electric water heaters)
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Old 08-07-2012, 07:37 AM   #30
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Hot water tank flue has hot exhaust coming out


I believe you said there is a louvre in the door to the kitchen area. With the A C running, the return air in the hallway, could also be causing a negative pressure in the mechanical room. Close off the louvres and close the interior doors. Crack the window in the mechanical room to let in combustion air to see if that solves the problem. If so then install a permanent opening to outside, i.e., a 3 inch vent with back draft dampers on the interior wall to allow air flow "in". May heat up the laundry room a bit but shouldn't affect the rest of the house so much that the AC can't keep up.

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