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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.
Well, the example was with a tent which is a single layer of cotton between you and the environment, and by no means resembles anything even remotely insulated. That's why it needs a relatively powerful heater to stay comfortably warm. In normal use you have quite a lot of control over the temperature of the heater, mainly with the size and amount of firewood -> effective surface area of the fire.
For static buildings the situation is different, with enough insulation you can get by with almost no heating. Zero-energy building is a thing in Finland as well, and although it has its challenges, it's still possible to keep your home warm with only your body heat in e.g. -40. The main difficulty you'll encounter there is getting rid of the moisture in air, since being that energy-efficient will require having your home almost fully enclosed. You'll also need to be careful to properly limit the moisture getting out from the house, as the dew point will be inside the insulation and any moisture getting out will condense inside, eventually leading to mold.
I haven't actually reached the end game in Frostpunk 1, but at a glance it would require some efficiency improvements and better insulation – and given enough insulation and heating anything is possible. If your people are sleeping under the sky hugging the generator, I'd assume you won't get past the end game. A real-world example that somewhat resembles the Frostpunk world would be people living in Yakutsk, Russia, where they have more of a brute-force approach to the -60 °C temperatures – just burn enough gas to keep your log cabin warm. Surviving outside at those temperatures without protective equipment would be difficult though, especially since most materials won't stay flexible at -120 °C or -140 °C. You'd find it pretty difficult to move around.
Edit: But also, a mandatory "don't quote me on this", as building is my hobby, not my job. I've some knowledge, and some experience, but by no means am I a professional.
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.
