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Country Discussion Topics
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Outdoor wood furnace
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Taylor Lambert    Posted 02-13-2005 at 20:29:36       [Reply]  [No Email]
A while back I asked about outdoor furnaces but i ran into a few other problems. I ime building my fire box now and have the outside air box finished. I know heating air wont carry as much heat as a radiator but ive run into one thing where might i find a pressure relief valve for this kind of out fit. Ill also us the hot air vent running to the shop as well as a radiator set up. I may add onto my shop and in the floor use copper tubing to make a radiant heat floor to keep the bum warm when changing the the brakes on my dump trucks. One of the ompanies we haul for is a custom saw shop the size scrap boards for the funiture industry and have a 40 to 50 yard dumpster full every 2 days. Gonna dump a few loads outside the shop, plus another outfit shells out hardwood blocks and strips. My fire box is 6 20 inch dayrton truck rims welded together with a fron and a back in them and a door that comesout of my old county dumpster/airbox. I wonderif I could use a an opentop container for my water and get rid of the pressure releif valve? just heat the water in an open top vat and pump the warm water around the shop and radiators.


marlowe    Posted 02-14-2005 at 09:29:32       [Reply]  [No Email]
just had a fire call sat. for a wood boiler the blow up pressure relief stuck or something NOT any thing left to tell was in a little shed 12x12 gone 40 ft. from house hole size of car in wall no one home no one hurt. neighbor mile away felt it and called DON'T use a pressure system go with open vent.if you see this mess you would not use a pressure system. my johnson open only uses 5 to 10 gal. water a year


screaminghollow    Posted 02-14-2005 at 07:35:10       [Reply]  [No Email]
I have a heat more, which has only 2 lbs of pressure, basically there is a flapper type arrange ment, like a check valve on the top with a small amount of weight. to allow too much pressure to escape. It then requires a circulator with sufficient head capacity to lift water any distance above the stove.

The new tubing for radiant heat, which is supposed to be far better than copper is called 'pex' tubing. or cross linked polyethylene. it'll take 100psi at 212 degrees. The stuff is kinds stiff, but comes in rolls 3/8 inside diameter is 1/2 outside, 1/2 inch inside is 5/8 outside. 3/8 is generally used only for supply lines to sinks and toilets. It comes in rolls up to 660 feet. it is far more flexible than copper and requires no soldering. you can bend it around corners and there is no gluing. the fittings are actually the weakest links, and you use copper rings and a crimper to join them together. The bad news is that the crimping tools can be quite expensive. (Lowes Home center $119.00) There are some cheaper available on ebay. I needed to crimp some 1 inch pex, maybe only 6 fittings. I bought a muffler clamp type crimper for $34.00, otherwise the cheapest 1 inch crimper I could fine was $154.00.

Also, in a radiant heat system, the water often flows slower than hot water baseboards heat. It is also kept at a lower temp. Around 125 degrees tops for radiant and 175 or 180 for hot water baseboard. For example, if you run 180 degree water through your garage slab floor, and heat the slab up to 140 degrees in spots, could you even lay or sit on it? even if only temp. Another consideration, I understand you can crack a concrete slab by feeding too much heat through a cold slab and heating it unevenly.



SY    Posted 02-14-2005 at 05:03:15       [Reply]  [No Email]
They make neopream tubeing now for radiant heat. It doesn't crack like copper tubeing.


deadcarp    Posted 02-13-2005 at 21:30:48       [Reply]  [No Email]
yeah you're miles safer with an open top. i had a brass popoff sitting right on the pipe.
that thing will be full of steaming water all day so you'll need some kind of lid to stop it from steaming away & let the juice drip back in. course then the reservoir & everything hasta be no higher than the stove. i've tried floating veggie oil on top of water which turned to guck & even tried foam, which distorted/shrunk. best luck was with a chunk of sheet rubber screwed to plywood & insulation over that. you're right, air only transports heat 1/2 as well as water. the stove front is the coolest face so doesn't pay to have that wet. double weld everywhere you can. allow 1/10th of the water depth for expansion. :)


Sid    Posted 02-13-2005 at 20:48:06       [Reply]  [No Email]
Taylor, that is the way that the Hardy outdoor heaters and a couple of others,that I have seen, do it. No pressure relief needed. You will have to check the water level on a regular basis or hook up a water line and a float contoled valve to keep the water level up to where it needs to be.


t    Posted 02-14-2005 at 17:45:47       [Reply]  [No Email]
Sid the landfill dad and I runn has a customer that runs a resaw shop and all the little plywood chunks would convey just right lol they have non treated landscaping timbers that they cutinto8 inch sections. i get lots of six inchchuncksthen all the presswood and ply scraps i can load into the 50 yard container. Id probably dump 2 loads out at the furnace one week then 2 at the house the next week. It doesnt get very cold here the coldest weve had was 10 this winter.we also have a a 3sided shead at work we may make a curtain for and make a woodfurnace for it to keep the equipment warm at night.


Taylor Lambert    Posted 02-13-2005 at 20:54:32       [Reply]  [No Email]
Thanks Sid I saw a fellow blow a water heater system up with a popoff valve using a tank and lines inside the fire box like a boiler. the popoff had quit working and caused his wood shed to disentigrate. I was leary of this set up and while typing the above message I thought of the open top vat I could use for this purpose to. I hate having to cover up all that scrap wood yhen having to heat the shop with propane I usually use 2 diesel jet heaters but thats too loud when you have company over. If it works good Ill probably make one for the house. Iwant to build a top load frebo so I can use a conveyor to load it remotely lol. I guess laziness is the true father of invention lol.


Sid    Posted 02-13-2005 at 21:11:38       [Reply]  [No Email]
That conveyor sounds like a good idea. I came up with a plan one time to cut a small access door in front of the stove so I could just stick one end of pole in the stove ans just shove it in as it burned but that one got vetoed.real quick by Wife.


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