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Wood stove

A

Anonymous-0

Well-known Member
Why is it that you cant put a wood stove exhaust through the same chimney as my gas heater? I want to put a woodstove in, but would like to route it through the same pace no drill a hole on the side of the house.
 
I think it has to do with the amount of heat a wood stove puts out through the pipe. My parents gas furnace at home vents through a PVC pipe. The wood stove vents through a metalbestos chimney to the roof. Even with metalbestos and the proper standoff from the framing it still gets really warm. You don't want to burn the house down to save a few bucks.
 
I made the mistake of running one through the same chimney as my oil furnace. Not a problem WHILE I was using it,but after I stopped,all the crud fell down and plugged the chimney so we were getting carbon monoxide from the oil furnace. I'd think it'd be even more dangerous with gas.
 
If the furnace draws combustion air from inside the house the CO can come back down the exhaust pipe and out into the house. also the other way around if running the furnace and not the stove.

Not a good idea at all.
 
Another reason I think is that a wood stove puts out a lot more heat then a gas furnace and it may not be able to handle the heat of wood.
 
If a gas valve fails it will blow lp gas up the chimney, and you have a ignition sorce with the wood furnace.

They usualy will not alow a gas vent up a chimney because the corrosion from the lp gas will eat away at the flue liner or brick. Some kind of bad reaction I understand.

What you suggested was outlawed here thirty years ago I would guess.

NE IA
 
Not an LP gas stove, a natural gas stove with city hookup. Oh well i guess another hole in the wall here i come
 
I looked a a combination wood/oil furnace last year. It only uses one chimney; I asked the sales rep about that and he said it was UL approved and legal. But that's with one furnace that's dual fuel; completely different than two separate connections to the same chimney. Still seemed strange to me...
 
It fits in the same rules, LP or natural gas. I personaly have never dealt with a gas valve that locks open, usualy they shut down, and will not allow the unit to fire.
 
My insurance agent told me a wood stove was fine to put in my house as long as it had a SEPERATE chimney
 
I tried for the last 3 hours to post a pic of my wood boiler and oil boiler useing the same chimminy, wouldent upload. Cinder blocks around clay flue tile. And Im not talking about a cheesy deal. 6'x3' base, with 9x13 and 8x8 flues in it. I added the wood stove in 2001. Now, the thing is the oil boiler only get used a few times a year. So maybe thats why I have no problems with it. I'll try to post a pic tomarrow. I also do have a co2 tester down there and it never has gone off. Nor the smoke alarm.
 
I have my wood and fuel oil furnace connected to the same chimney. Its been that way since my dad installed the first wood furnace in the late 70's. I installed a new wood furnace a few years back. The insurance inspector inspects the house every three years and has never had a problem with it.

<a href="http://s41.photobucket.com/albums/e280/Scott1066/?action=view&current=HPIM0639Small.jpg" target="_blank">
HPIM0639Small.jpg" border="0" alt="Photobucket
</a>
 
The vent gas from either a natural gas or LP stove, mixed with smoke from a wood fire make sulphuric acid. This acid eats the cement mortar from around the bricks. Not a good thing to happen inside your house when you are trying to keep the heat away from flamible material.
 
When burning wood you get the gummy stuff called Creosote. Which will build up in the pipe. oozing down the stack. This stuff is extremely combustible, it is the cause of most chimney fires. I would say they don't want this oozing back into the furnace and starting it pipe on fire.
 
The wood stove pipe in the pic is hooked together improperly. It's backwards. The crimped ends of the pipes are supposed to point to the stove. This way, if creosote oozes back down the pipe, it goes into the stove, not ooze out of the pipe all over the place. This is very important in case of a chimney fire so you don't have flaming creosote running out into your house. I'd fix that ASAP if I were you....
 
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