Cast out from the jungle / With no rations or canteen

Once the stove exhausts most of it's hydrogen fuel, the stove will enter it's Red Giant phase and grow to the size of a small car.

This comment makes me wish I could gild comments on Lemmy.
- That's exactly what I was missing: giant distracting icons that flash on a comment I was going to read anyways!
- Lemmings are herbivorous, give them a leaf. 🥬

I found it! The source of global warming! Contained entirely within some guys shop

Actually I think this might be the cleanest stove yet. High temperature and enough airflow to allow for such heat means all of the fumes get burned.

They're running that thing a bit too hot

Just a tad
- I honestly don't really see anything else that's horribly wrong here. It's a home made stove. I kind of like it

Warms the whole workshop within ten minutes? More like burns down the whole workshop within ten minutes.

At least everyone inside will be warm for the rest of their lives
- Give a man a fire and he is warm for a day.
  Set a man on fire and he is warm for the rest of his life.
*also warms the neighbours house in ten 5

Are they casting Sauron's rings in that thing? Jeebus.

This looks more like a forge than a heater.

That can't be safe

It's safe enough, in the Finnish army we occasionally get the tent heater red hot, and as long as nothing flammable touches it or is too close, it's fine. It will radiate heat quite well when that hot, but won't be anywhere close to dangerous if you know what you're doing. In the tent we of course have some water nearby to extinguish the possible flames but still.
You basically need to have it glowing red if you're to keep the tent warm in -15 °C or lower. - 30°C needs something closely resembling the picture posted.
Here's an example, unfortunately hosted on Reddit https://www.reddit.com/media?url=https%3A%2F%2Fpreview.redd.it%2Fjiquty6qz7s51.jpg%3Fwidth%3D1080%26crop%3Dsmart%26auto%3Dwebp%26s%3De4b8083400858eccc1786d7b32b94b759b2bc6c2
- You make it red hot because you don't want to crawl constantly back into the tent. And you never, ever want the fire to go out, because of all the shit you'd get for it. Mansikka for life
- I need your to consult on Frostpunk 2. The first game insists people can survive -140° C and that's like, -220° F.
But it is warm
- It will keep you warm for life
It's not, it's a heater
- I was hoping to see a comment like this. You did not disappoint.
As long as you don't run it more than 10 min then it's safe.
Never met her.
It does look a bit like it's on the verge of exploding.

Are you using uranium as fuel?

Why is there a picture of the Fukushima nuclear core in this picture?

It's glowing bright red with coldness.

He's not lying, everything he said is true... Note he never claims that it was done properly!

You sure that's not a jet engine?

mmm malleable

Looks quite efficient. See also: rocket stoves, specifically the pocket rocket design. Though the ones with lots of thermal mass probably serve folks better while taking up more space. Various wood gasifier stoves are pretty neat. I've got a little one for camping.

In this instance, I'd predict the components of this stove will oxidize away quickly.

It is all stainless steel. So it will be able to last.
I once combined a steel can wood gasifier with an aluminum alcohol stove using an ethanol and peroxide fuel that could boil 500ml of water in under 6 minutes with an ounce of fuel and burned violet. Not ideal for lightweight camping, as I intended, but man was it efficient.

What's the chimney made out of, I can't tell

pure red
- I can't shake the feeling it looks like plastic, but that means we'll have imminent catastrophic failure.
- It's clearly hard-to-focus-on purple
Stainless steel spiral crimped corrugated. Same type they use to reline chimneys for appliances or some gas burning fireplaces. Looks like 6".

I think it has reached critical mass

You can throw an ice cube at that and kill everybody in a three block radius

And then one day you are there working on something at the vise, you drop something, and then you need a full back graft, and now you have weird hairs growing in your shoulders.

Engineering without limitations

Imagine hitting your pinky toe with that shit