How long will a mr heater run on low?
A Mr. Heater Big Buddy on its low setting (4,000 BTUs) will typically run for approximately 5.5 hours when using a single 1-pound disposable propane cylinder. If two 1-pound cylinders are connected, its run time on low effectively doubles to about 11 hours. Using a larger bulk propane tank with an appropriate hose extends operation significantly.