How long will a 100 lb propane tank last at 30,000 btu?

A 100 lb propane tank contains roughly 23.6 gallons of propane. Since propane has a heating value of about 91,500 BTUs per gallon, that equates to about 2,157,600 BTUs total in the tank. If you're using a device that consumes 30,000 BTUs per hour, you can expect the tank to last approximately 72 hours of continuous use—perfect for those long camping trips or barbecues! But there's a catch! Weather conditions, equipment efficiency, and usage patterns can all impact how long your tank will last. For example, if it’s colder outside, you might find that your propane burns a bit faster as the system works harder. It’s always a good idea to keep a spare tank handy, just in case!