LP Radiant Heater, Heat Star by Enerco 22,000 BTU Propane High Intensity Radiant Workshop Heater Heatstar High Intensity Radiant Propane heaters require no electricity and are great for use in workshops or garages. As Seen on Ask This Old House. 22,000 BTU per hour For use with Liquid Propane Heats up to 500-600 sqft For use in buildings with 7 to 8ft ceilings Efficient infrared heat that directly heats people and objects which in turn heats surrounding air to desired temperature Includes adjustable thermostat for individually controlled warmth and all necessary brackets and hardware No electricity required Easy to install No moving parts to service Quiet, clean, odor-free operation Non-corrosive materials used throughout construction Learn More