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DangerMouse 01-29-2009 04:54 AM

black steel 2" heating, is it safe?
i went to a job yesterday and this guy was heating his whole house with a small woodburner. what he'd done is built a "filter box" next to his wood stove built around one of those 1200 or so cfm blowers you find in new furnaces. this was hooked to 2" black steel piping that ran INTO his woodstove and back out again and was piped through the crawlspace to all the rooms! pipes stuck up from his floors with elbows to direct the flow. it was like having a hair dryer on 'high' all the time. i must admit, when i used the can, i saw a thermometer on the wall and it said 75 degrees! i'm assuming the filter box was to keep dust from building up inside the pipes. how safe do you guys think this is? if it's deemed ok, i might try it in my own home. propane is expensive.... but we have a woodburner too. (i thought the heat would deteriorate the pipe, but he said by keeping it running all the time a fire is going, it wouldn't) i can get pics later as i need to go back and finish the door today.


beenthere 01-29-2009 05:48 AM

Black pipe is used on steam heat, and steam process systems.

Steam process can be over 100PSIG, which would be temps inexcess of 327F.

DangerMouse 01-29-2009 08:05 AM

but.... this is not steam, it's just hot air. my biggest concern is, of course, for safety. i just got back from there and looked again and asked a few more questions. he says he's done it for over 4 years and never had a problem. our woodstove heats the living area nicely, but the back rooms get none at all and need propane. i also asked about the life expectancy of the blower and he said it's the same one he started with, and it runs 24/7 all winter! he also added he insulated the pipes down below in the crawl space and it improved it greatly.

well, duh. hehehe

but is it safe? has this been done before and i've never seen nor heard of it?


beenthere 01-29-2009 08:20 AM

Little to no difference weather its steam, or just hot air.
The outside of the pipe for either is exposed to air.
So no problem with harming the pipe.

Its condensation inside or outside of the pipe that would harm the pipe(rust it out).

As far as safe.
There where a lot of fireplace heat exchangers that were made out of steel pipe, and a blower hooked to it.
The logs were placed directly on the pipe inside the fireplace.
No problem with them. Except a fan or 2 going out.

Is it safe to run through the whole house?

That would depend on how hot the pipe can get.

If there is no automatic safety to put out the fire, then it is UNSAFE.

DangerMouse 01-29-2009 09:17 AM

he put a pack of matches on the pipe right outside the stove and nothing happened, but the pipe was too hot for me to hold for more than a second there, but at the other end it was just hot, maybe 100 to 120 degrees. i got some pics if you think they'd help. it's pretty cool!
and boy, could we use the heat!


Bondo 01-29-2009 09:27 AM


As long as the Heat Exchanging tubes Inside the firebox are inspected,+ kept in Good Condition,...

I can't see any Safety issues with it...

DangerMouse 01-29-2009 10:13 AM

since our whole living room wall (all 12' to 8') is solid brick, i was thinking of designing my own system like that, as i want to build in a fireplace (and create a new mantle shelf) rather then this OLD woodstove. hmmmmm this has really got me thinking.... i have a friend around the corner to weld for me... maybe i'll design my own 'insert'... *grin* i already have a kickin' blower for it....


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