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Old 11-30-2011, 08:20 AM   #1
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Old furnace removed , hole in chimney


Hi All,

My old oil furnace was removed and now there is a circular hole in the chimney about 7 inches in diameter. What is the best way to close it off, since there is also water heater feeding into chimney above. Im afraid carnon monoxide might get in.

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Old 11-30-2011, 08:27 AM   #2
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Old furnace removed , hole in chimney


Use a 7 inch flue cap and refractory cement, or brick and mortar.

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Old 11-30-2011, 08:48 AM   #3
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Old furnace removed , hole in chimney


Ayuh,... The quick, 'n easy way is the 7" flue cap/ plug noted above...

They can be found at most any hardware store...
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Old 11-30-2011, 11:23 AM   #4
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so do i remove the netted piece from the bottom of the cap before cementing it in? or what is the proper way to attach it. Its just a round hole in chimney.
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Old 11-30-2011, 04:10 PM   #5
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Old furnace removed , hole in chimney


post some pics of it and where the water heater enters etc.
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Old 11-30-2011, 05:29 PM   #6
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Old 11-30-2011, 06:00 PM   #7
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Ooooh that is ugly!! Not sure what material that is made of and how to seal it properly. Hang in here and maybe someone with masonry experience can help. Try post this in the Construction forum at the top of the page for better odds of running into one of them.
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Old 12-01-2011, 03:49 AM   #8
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Old furnace removed , hole in chimney


What size is the inside of that chimney? Your orphaned water heater may not be able to keep the chimney warm enough for it to draft. This will cause the water heaters flue gasses to condense in the chimney and and eat the mortar. Along with allowing CO to escape into your basement and house.

Probably need a liner dropped in the chimney to safely use the water heater.
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Old 12-01-2011, 05:40 AM   #9
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Old furnace removed , hole in chimney


seriously? i would guess it should be ok as long as i close off the hole since the furnace was being used only during cold months so the water heater was mostly used alone.
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Old 12-01-2011, 05:56 AM   #10
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Old furnace removed , hole in chimney


Beenthere is correct. code won't allow an unlined chimney with a gas appliance where I am. now in your cold months the problem will occur. it can also ice up/plug the chimney and spill CO into your house. need a 4 inch liner if it is a 40 gal tank. where do you live. if it is in a very cold climate like mine you may need a B vent/insulated liner as a single wall type can still freezeup.
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Last edited by yuri; 12-01-2011 at 05:58 AM.
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Old 12-01-2011, 06:59 AM   #11
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This is in Jersey, i will peek inside the chimney to see if anything is there...
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Old 12-01-2011, 09:28 AM   #12
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Old furnace removed , hole in chimney


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Originally Posted by yuriy128 View Post
seriously? i would guess it should be ok as long as i close off the hole since the furnace was being used only during cold months so the water heater was mostly used alone.
The old furnace kept the chimmey (and the air in it) warm in the winter, so the hot vented water heater gas did not cool down much and it rose out of the chimmey correctly. The water heater requires hot air to vent correctly, it's doesn't have a powered vent fan to push it out.

Now the water heater gas is going to have to fight against a "cool air plug" in the chimmey and the combustion gas is just going to sit in the chimmey during cold days (depends on how much of the chimmey is exposed to the outside air).

You most likely need a liner or replace the water heater with an electric water heater or direct vent gas type that doesn't need a chimmey.

http://absolutehomeperformance.org/i...er_Heaters.pdf

Last edited by bungalow_steve; 12-01-2011 at 09:31 AM.
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Old 12-01-2011, 11:53 AM   #13
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Old furnace removed , hole in chimney


electric water htr is the best bet where I am and we are steadily getting rid of NRG wasting chimneys and converting over to them. a chimney is essentially a 4-6" hole in your roof/house and 24 hrs/day heat and $$ rise out of it.
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Old 12-01-2011, 12:14 PM   #14
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electric water htr is the best bet where I am and we are steadily getting rid of NRG wasting chimneys and converting over to them. a chimney is essentially a 4-6" hole in your roof/house and 24 hrs/day heat and $$ rise out of it.
Agree, if is was me I would replace that water heater with a $300 electric and seal that bad boy completely up!
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Old 12-01-2011, 12:14 PM   #15
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Old furnace removed , hole in chimney


in terms of efficiency, isnt gas supposed to be cheaper? Also can anyone ballpark a electric heater installation will run me?

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