Mr. Heater also makes a filter that you are supposed to use if you run a regular hose from a large tank. That's what we use. Our first night in Big Bend a few years ago was our first test run on the Heater Buddy. It worked like a charm except that on high, it will run through a small bottle in about 2.5 hours. It was 18 degrees out, and we were nice and cozy.