Mr. Heater MH30T Tank-top Heater Feature: Variable BTU's - 8, 12, 14, 16, 24 and 28,000 BTU/HR Adjustable Heat Control - Hi, Med, Lo regulator; Operate one or two burners at a time Instant Heat - Piezo push-button ignitor (Model MH24TS) Safe - Heater shuts off automatically with loss of flame Ready To Use - Mounts directly to a 1-20 lb propane cylinder (not included) Maximum Heating Time / Hi - Up to 15 hours on 20 lb cylinder For outdoor use only