Mr. Heater MH18CH Radiant Cabinet LP Heater Reflective radiant heat with the warmth of the sun. That is the Mr. Heater Portable Cabinet Heater in a nutshell. This Radiant 18,000 BTU Portable Propane Heater requires no electricity and is whisper quiet. With factory installed features like a tip-over safety switch and a thermoelectric safety valve with three heat settings of 6K, 12K, 18K BTUs, the only thing you need to make this heater the most useful tool you own is a 20lb propane tank. Just hook the tank up to the hose and regulator, stow the tank in the cabinet behind the burner, then enjoy the quiet warmth of the Mr. Heater Cabinet Heater. Features Hi-med-low regulator Automatic low oxygen shutoff system No electricity needed CSA certified. Outdoor use only. Run time (hours at maximum BTU) is 24 Hours and run time (hours at minimum BTU)is 72 Hours Heats up to 450 square feet USA SHIPPING estimates delivery times and we work to get your item to you as quickly as possible and within those times, but please know it may take slightly longer than the estimate.