Efficient heaters that will heat warehouses, garages, workshops, and homes effectively and safely. Selecting the proper heater is key to minimizing your heating costs. First determine the fuel source you wish to use to power your heater: natural gas, propane, or electricity. Then estimate your heating space square footage. You can use the Heater Sizing Calculator to calculate how many btu's you will need to heat your area. Whether you are heating a bathroom, room addition, garage, tent, or warehouse, you can find the right heater.