The Hero35 from Mr. Heater is a portable propane and lead acid battery powered air heater. It is an economical solution as it is cordless and doesn`t require electricity. Providing heat at 35,000 BTU per hour, the Hero 35 is capable to cover areas of up to 875 sq. ft. It operates approximately 8 hours on a single charge. Mr. Heater MH35CLP requires 20 lb propane cylinder and is quieter than other propane heaters. Its carrying handle makes it extremely portable. Ideal for industrial and commercial workspaces.