Determine BTU

When you start considering the idea to purchase a heater for your garage, you think about the price of the heater, its design, but most importantly-about its size, because you want  a heater that’ll properly heat your garage without consuming more money than needed. You should know that the size of the heater has little to do with its capacity and you should figure out if you want a heater that will give out heat fast or a heater that will give out a greater quantity of heat at a lower pace.


  • The first thing you have to do is find out the dimensions of your garage-that is the length and the width.
    To obtain the square footage of the room, all you have to do is multiply these dimensions.
  • Next, you have to take into consideration if your garage is insulated or not. If you’re the owner of insulated walls and of an insulated finished ceiling, you will use a smaller heater. Remember that an uninsulated garage accelerates heat loss.
  • For determining the proper size of your garage heater you must know the BTU requirements (British Thermal Unit). To find out this BTU, divide your total square footage by 200 and then multiply the result by 9000. This is the BTU requirements for an uninsulated garage. For a insulated one, multiply by 6000 instead of 9000.
  • The final step is to find the heater according to your BTU and you’re done.

Don’t forget!

  • Before buying a heater, look at the watt circuit and find out if it is 120 or 240.
  • It’s recommended that you insulate your garage for a more powerful heating.
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