out side wood heater

[NH-Rob]

I needed a way to heat my small workshop without having a open flame inside it. I am hoping to be able to spray some paint in there and still be warm. My solution was to combine a old double wall wood stove with a heating oil tank to make a outside warm air furnace. So far it has worked real well. I still need to make some more modifications to add more safty into it such as an insulated chimney and a heat dump incase power goes out. Let me know what you all think good or bad. I am defintally not an expert with heating with wood but figured this would work so I gave it a try.

You can see the basic stove. I have the stove mounted inside the tank and wraped with insulation to keep heat in and cold out.

I started with flexible insulated duct but the heat output was over 200degs and duct is only rated for 200 so I used galvinized duct wraped with insulation from the flex duct. I left the flex duct on the intake side as air is only at room tempature.

you can see the reg stove pipe used for the chimney. It does work but draft has to be kept open more than I would like to keep pipe at a good tempature.

I have a blower mounted to the wall in my shop pushing air into the base of the stove and the exiting air blowing into the end of my workshop. With a poorly insulated 8x24 shop I was able to have it at 70 deg with it only being 17 deg outside.

Robbie

 

[jerrybob]

Nice job.....sounds like you solved you shop heating problem. Get that chimney figured out and enjoy!:thumbsup:

 

[groundcover]

Good thinking ! Pretty cheap heat ,nothing wrong with that !:thumbsup:

 

[lutt]

Robbie, I have a friend in the irrigation well drilling business. When I rigged up a forced air furnace in my garage in my former house. I used 8" well casing, dont know what u guys have up there, but it is good thick steel, I picked up 30' for 60 bucks, it was used. But, what I was getting at, was it is heavy duty enough it wont burn out and you could insulate it. I wish I had picks, but I dont at this moment. LUTT

 

[toy]

Robbie, I have a friend in the irrigation well drilling business. When I rigged up a forced air furnace in my garage in my former house. I used 8" well casing, dont know what u guys have up there, but it is good thick steel, I picked up 30' for 60 bucks, it was used. But, what I was getting at, was it is heavy duty enough it wont burn out and you could insulate it. I wish I had picks, but I dont at this moment. LUTT

I did the same thing in my smaller garage [24 foot by 20 foot]. I stood the pipe up about a foot from the garage and welded a t in it and ran a pipe the same size through the wall half way up the wall. I then ran the stove pipe into that and it works well. My garage its a block garage so didn't have to worry about putting the pipe through the wall but I still filled the blocks up with cement around the pipe just in case. I have a block building that is larger and it has a block chimney with flue liner in it, I have a wood coal furnace in that one and a wood coal stove in the other. I heat with coal but use wood to start the fire, and even if you aren't doing anything it is enjoyable just sitting by the stove. Both of my stoves/furnace is on the inside of my garages.

 

[rayclar]

insulate the outside tank and you will get a lot more heat also?

 

[NH-Rob]

insulate the outside tank and you will get a lot more heat also?

I have the inside of the tank filled with insulation. the end by the stove pipe and around the door are the only places I am loosing heat. snow will sit on top of the tank and ducts while its cranking out the heat so it can't be loosing too much. When I slid the stove inside the tank I put it tight to the back wall of the tank so no insulation there. Do you have any ideas on how to insulate the back of the tank?
Robbie

 

[chopped]

Very interesting this has my mind thinking now..how were you able to insulate the inside?

 

[jwmorris]

I rigged up an outside heater a few years ago. Used a sectiom of 36" diameter 1/2" wall pipe and some foil backed chip board to make up the outer chamber. Built a recessed door and bolted it to a 55 gallon drum with stainless 10/32 screws. Just used two sections of 1" box tube across the inside of the pipe to set the drum on centered. Even drawing cold outside air (vs recirculating inside air) outlet temps were in the 185 degree range on really cold days.


The pipes on the end are just to take up space, didn't want to cut up the long pieces of all thread or run the nuts down the entire length.

 

[NH-Rob]

Very interesting this has my mind thinking now..how were you able to insulate the inside?

I just used unfaced 6" insulation and slid it between the tank and the stove. wish i had taken pictures before I buttoned up the tank. I was not expecting it to work as good as it has so far. I did make the end cap removable by taking out 4 screws and cutting the silicone caulking.
Robbie