[Mac VP]

If you’re going to have gasoline in the building, don’t run a heater with a flame, and that includes any propane or natural gas fired radiant heaters. You can’t anticipate when the gasoline might leak from whatever storage container it’s in (and that includes a vehicle gas tank). If gasoline must be in the room, stay with electric heat. If f you can remove the gasoline from your building, there are many other heating options besides electric. If there’s no gasoline in the room, non vented gas fired heaters can still present a problem for carbon monoxide buildup unless you have a lot of air leakage around doors and windows.

Any electric heater that runs on 115 volts (which uses about 1500 watts of electric) will never create more than about 5000 btu of heat. This means you can run just one per circuit. This generally means one or two 115 volt units in the room depending on how many 115V circuits (not outlets) that are wired to the room. Even if those are 20 amp circuits, it doesn’t leave much juice to run anything else if the heater is running. Lastly, a low surface temperature heater (no red hot elements and plenty of moving air) are safer for the shop environment. Stay away from a heater that can be tipped over easily or doesn’t have a tip over switch. Straight electric heat is generally much safer for the shop but will be more expensive to operate. Not a bad trade off to keep your cars and stuff safer….not to mention the building itself.