This Mr. Heater portable propane-powered heater is made to work hard and reliably. Using two 1lb propane tanks stored onboard the unit, this heater can heat up comfortably 450 sq ft with a max of 18,000 BTUs. The built-in Piezo starter reliably starts the unit and safely operates in smaller areas with an oxygen depletion sensor (ODS) and accidental tip-over safety shut-off. This item also comes with a 12.5" thermocouple lead replacement for this model. Measures 11.87"D x 19"W x 17.5"H.