I wouldn't use it for comfort heat while sleeping, but might be nice for camping none the less. 

http://www.fitsmybudget.com/50colpowporc.html 

The new Coleman ProCat electronic ignition catalytic heater was designed to be used in enclosed areas, such as the work shop, tent, ice fishing duck blind. It's whisper quiet and reliable flameless warmth goes wherever you do, and is perfect for "standby" heat emergencies. 

Designed for indoor use 

Use the fan for better heat circulation (requires 2 D Batteries not included) 

3,000 BTU Catalytic heater with platinum technology provides flameless warmth 

Pressure-regulated propane fuel system 

Operates up to 8 hours on 16oz. Coleman propane cylinder 

5053A-751Retail price: $84.95 FMB price: $59.95