questions on outside wood furnace

[barnyardgal]

I have an outdoor wood furnace-no name brand-no water system-just regular outside wood furnace--
heats 2500 sq. ft. house pretty good---

My question is should i be using insulated stove pipe & how high should it be?? I have been doing research & in one wood stove forum said he used scedule 40 6" for his pipe?? What?? Is there another schedule 40 besides plumbing pipe??Not trying to be stupid here,just trying to learn~~

The guy who installed my wood furnace said 3' of non insulated stove pipe is sufficent BUT the pipe keeps getting build up in it & i have to knock it down with a board from the outside.....right now i am up to 9' of non insulated pipe & am already getting some build up...

The wood i am using is 2 yrs old dried & is all oak~~

The stove sorta sits down in a hole on the north side of the house,am sure this has something to do with the draw---was wondering about going with insulated stove pipe about 9' up which won't go over the clearance of the house,but to me seems it would be better than 3' of non insulated pipe???

Any experiences or suggestions would be appreciated........

Thanks in advance!!

[mink]

my furnace only has about 2 feet above the furnace roof. the only reason i could see to put more pipe on is if your having a smoke problem around your house. if so id use more insulated links , but if you get to high your going to need some system of guying the pipes.

[Bearfootfarm]

The build up comes from the stove pipe being too cool, and letting the smoke condense.

Double wall pipe will help

.

The height doesn't much matter as long as it draws well, but as a general rule taller is better

[SillyMe]

Hi BYG - you probably would benefit from one or two 3 ft. pieces of tripple-wall or double insulated chimney pipe. The reason you're getting so much creosote buildup is that the smoke, which contains the creosote, is coming in contact with the cold single-wall pipe and causing condensation of the tar in the creosote. The tar is chilled and turns into a hard layer of gunk inside the pipe. A well insulated chimney pipe will allow the inner surface of the pipe to stay very hot and the tar will run down and into the stove/furnace and will be re-burned.

Take a look at other outdoor wood furnace installations in your area. I think you will find that most if not all have insulated stainless steel chimney pipe.

Give a reputable chimney sweep a call and ask advice.

[mink]

i should of said mine has stainless insululated pipe , one section. i occasionally get some sooty buildup on the top edges but i just use the furnace rake to scrape across the top. that said insulated pipe is the way to go.

[barnyardgal]

Thanks~guess you guys just reinforced my own answer & that was to go with insulated stove pipe & guess what i will be doing today...

[Ross]

You should be 3 feet higher than anything with ten feet.

[rambler]

The root of the problem is that it's not that cold, and your stove is choked down to a slow smolder most of the time, where it creates a lot of smoke and not much heat on the chimney.

Keep the chimney short and make the furnace work once a day - ask for 5 degree warm up - so it can fire up and burn hot, and that stuff will burn itself off/ evaporate out the chimney while it is very very little and causes no harm.

--->Paul