This Mr Heater Natural Gas Infrared Heater provides efficient economical comfort by directly heating people and objects which in turn heats the surrounding air to desired temperature Vent free design No electricity is required making it ideal for use during power outages U S A Features . Shows contents of tank. Brass construction. Fits propane tanks from 5 lb up to 40 lbs tank not included . Meets all Type 1 safety standards Specifications . Product Type Gas gauge. Fuel Type Propane