I just purchased a Mr Heater Big Buddy heater and love it! It gives you the option to use 1# disposable LP tanks or use an optional hose for a 20# cylinder. I used mine last weekend on Mil lacs to Sleep overnight in my Otter Lodge - since my accomodations at Dickies Portside were so bad - and it worked all night with no problems. I ran the battery operated fan all night and it was running in the morning, I plan to leave my 20# cylinder home when the weather is mild and I'm only going for the afternoon.
I also run the Big Buddy heater it comes in great i used it when i had a house fire it ran for 3 days straight and went though only 2 1/2 cases of 1 pound cylinders i have been using the energizer battery's and only replaced them once so far this winter.. now that i can drive out on the ice i have been using a 20 pound tank and a hose with a filter..