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"Do you have the intelligence to use one correctly?" I'm sorry, but as far as I can see there is no such thing as use one correctly, there are simply too many hazards around. We have the obvious carbon monoxide poisoning, but also anything falls on a bivvy heater and you can have flames that take hold in seconds. To keep heat in, you will want to shut the door. That increases your risks to start. Then while the heat is on, you may well fall asleep. Is that a sign of carbon monoxide in itself? A stove in the bivvy is a big enough risk in itself. I think every anglers groundsheet probably has melted patches on it from the stove in the foorway and putting a hot pan or kettle on it... The answer is proper clothing, decent sleeping bag. Finally, just as a reminder, and remember I know the guys concerned, it was that local to me: https://www.anglersmail.co.uk/news/bivvy-blaze-horror-81088

I use a Nash indulgence 5 season sleep system and have done nights where the temperatures gone down to -6 and have still been toasty and warm. IMO you’d be better off forking out for a good bedchair and thermals, bivvy heaters are far to risky.

Eat carrots. Save money. Ian.

I have one. They are fine. Lots of room, quick to put up. They are over priced for what they are though, but very few other bivves offer the same space. Do consider a Fox R-Series Xl, much better value for money.

£400+ For a torch 😂😂😂

I don't think either reply was an over reaction. The fact that are researching and sharing your findings indicates that you are in 'pre-buy' mode (and encouraging others in the process). You are playing Russian Roulette and I would urge you not to consider buying any device that has to potential to cause death. If the weather is very cold, I think you would lose more heat using a letterbox setting than you would gain from a heater so some people would simply seal up the bivvy.

Went through the blender 😁