Furnace idea.

[rowerwet]

so we've gone from small simple and cheap to elaborate, complex, bulky, expensive...
I'm still not giving up on the cookie tin, or my own lantern in a mailbox idea.

[mikeschn]

I'm still not giving up on the cookie tin, or my own lantern in a mailbox idea.

Home depot sells a really heavy gage mailbox. It must be at least 1/16" thick!!!! You could build a real fire in that! Add an inlet and outlet to the outside and you are in business!

Mike...

[rowerwet]

I'm looking for suplimental heat, not a sauna...
I will already be dressed in fleece and a knit hat, under a sleeping bag or two.
I just want as much heat as another body would add.
my tear has 1" foam in the walls, and will have 2" foam in the roof and I have a 12V heater to warm the tear up before bed. If that doesn't work I'll look into getting a large dog!

[oakinteriors1]

Wood fired thermosyphon heater.....the Chofu heater...


And the same principal worked for me...
http://www.poolspaforum.com/forum/index ... ntry115105

[rowerwet]

sweet! I love the tub!
using the idea camping though has a lot of equipment to move and set up...

Now I know what to do with that 175,000 BTU outdoor pellet boiler I'm trying to sell... I'll get something for my money since no one has bought it yet, now I just need a non funtioning hot tub or plans to build a nice coopered wooden one...

[KCStudly]

"Plans? You don't need no stinkin' plans." (paraphrasing Blazing Saddles)
)

[rowerwet]

now sure how plywood and epoxy would handle 100 degree water... that's what I build with...

[KCStudly]

I was thinking redwood or cedar. Perhaps just treated frequently with mineral oil. 316 stainless steel for the straps.

[oakinteriors1]

sweet! I love the tub!
using the idea camping though has a lot of equipment to move and set up...

Now I know what to do with that 175,000 BTU outdoor pellet boiler I'm trying to sell... I'll get something for my money since no one has bought it yet, now I just need a non funtioning hot tub or plans to build a nice coopered wooden one...

Around here craigslist is loaded with free hot tubs..The one I got had a working pump but the electrical was shot...
I don't remember the gallon size of my wood fired canner....

[mikeschn]

I came across this photo this morning... It looks like a Mr Heater installed where the wood burning stove would normally go...



Kinda throws everything we been discussing about safety out the window. And here on a different forum there is quite the range of opinions..
http://www.popupportal.com/index.php?topic=45257.0

Mike...

[GPW]

No visible vents either ...

[rowerwet]

to preheat before bed, preheat before crawling out in the morning, a few min won't kill, all night you will die from co2 and CO if not drown in the condensation...

[Cantputt]

Buddy heaters work great. Used one for a couple years. My understanding is that the CO2 is not an issue because they burn so efficient. I keep a CO2 detector just in case. They have a great Oxygen sensor built in that shuts it down if it gets too low. Just crack open some windows, or cut in some vents, and you are good to go. I run a fan to move the hot air around. I don't run it while sleeping, have plenty of sleeping bag to stay warm. But I keep it warm in the evening and mornings. It gets pretty cold in Northern Mi during the winter.

[MtnDon]

My understanding is that the CO2 is not an issue because they burn so efficient. I keep a CO2 detector just in case. They have a great Oxygen sensor built in that shuts it down if it gets too low.

The problem is CO, carbon monoxide, not CO2, carbon dioxide. You probably have a CO detector/alarm. You are not the only person to make that error; I run into it a ferw times every year on the cabin forum I administrate. We can't smell either one. BUT our blood loves to pickup CO molecules more than it likes to grab onto the O2, oxygen we need. Given an atmosphere containing a few molecules of CO our blood will snatch them up first. And our blood does not like to let go of the CO once it has some. So even short exposures to CO should be avoided. It is possible to have so much CO in the blood that even breathing pure oxygen can not reverse the process of dieing. Because we can not smell or see CO it is a crap shoot. I don't mind gambling with a few disposable dollars at times, but if it was my last dollar like this is my only life I refuse to gamble.

The low oxygen detectors are a help. I would have a CO detector for certain though and be certain the batteries are fresh. The oxygen depletion sensors also don't work properly at higher elevations. There is some debate as to when they start to be undependable but it is someplace between 4 - 5000 feet. The heater won't work at all when the oxygen depletion device kicks in. That may not matter to some but since I have spent most of the past 28 years between 5500 and 9000 feet it matters to me.

With all the warnings printed on the heaters and the papers that come with them we would think it impossible that there would still be deaths attributable to CO poisoning. However it still does happen to campers.

[rowerwet]

the O2 low level sensor will shut the heater off, but the damage may already be done to your body at that point.
red blood cells carry your O2, imagine a cheerio with the hole sealed off, O2 and CO2 sticks in the divots on both sides, CO sticks there too, but then won't let go. that cell is no longer able to carry O2 to your brain or anywhere else. Until your body grows another red blood cell to replace the "corrupted" one(s) you have a problem getting enough O2 in and CO2 out.
Since you have thousands of blood cells the damage isn't instant, but builds up over time. Your blood cells live for only so many days, they grow in your bone marrow, when you are sleeping mostly.