molonlabe
Ultimate Member
I've used catalytic heaters which produce heat by a catalytic action with a platinum element. It is considered mostly frameless and are often used to heat RV's. I personally would not use them without CO detector. They are available on line. I use a hand held one used by HVAC installers to confirm the gas or oil flame is adjusted properly. I have a ventless heater as a back up in case I lose electric. Last year I used it for 4 hours during an outage and the CO never went above 2ppm. Do not use a CO alarm because they will not sound until you get to 35ppm. I want a warning long before that. That being said oxygen depletion becomes a issue in a confined space so there needs to be adequate ventilation. So all those issues leads one to balance the safety with all the information above. Personally if it was just me I could handle it. Add several more people further depletes the Oxygen. I would go with good sleeping bags and undergarments. If you get up in the morning the cold will be like a fresh cup of coffee. In my younger days I've backpacked and was caught in blizzards and survived quite well because I had good gear.
My 2 cents hope this helps.
My 2 cents hope this helps.