Bring warmth to chilly job sites with help from the Mr. Heater Convection 25,000 BTU Liquid Propane Heater. Ideal for use on outdoor job sites, this heater supplies up to 25,000 BTUs per hour and can heat up to a 625 square foot space. The design utilizes the natural act of warm air rising to provide a reliable heat source and burns clean and quiet for safe, efficient use, while the standing pilot offers safety.