Hack where you live, it’s around 50 btu per sq foot for an insulated space to maintain 70 degrees inside. The key is to insulate.
Say your garage is 10 x 20.
That’s 200 sq ft.
200 x 50btu equals 10,000 btu.
To maintain 70 inside, when it’s 0 outside, you need 10,000btu of heat.
There is about 3 btu of heat for 1 watt.
Divide 10,000 by 3 gives 3,333.
3,333 watts of heat is what you need to heat that 200sq ft garage. If it’s insulated.
2 of these will deliver 1,500 each, or 3,000 watts of heat.
Which is close, a bit under, to what that garage needs.
2 of these should keep it warm for all but the coldest of nights or days. Those times they might only maintain around 60 degrees inside.
Well thank you MG!
My garage is decently insulated . The roof is pro sprayed closed cell and the walls are the cheapest bats.
The single overhead door has some insulation .
The walls are only 7’ but the cieling is peaked.
I think I am closer to 20x20 plus open to a smallish back office .
I do plan on running a new 20 amp line back there .
But at the moment I only have one 15amp line for outlets .
I suppose I could heat and work in the back room but I really need access to everything .
This is good info .
I don’t have to be at 70 . But that is ideal .
I should have brought in a furnace years ago .
I may have to combine a couple of methods .
rising crime rates are hurting American moto enthusiasts.
A wall mounted propane heater that I bought at the neighborhood farm and home store for my 22 x 24 garage with 9’ high ceiling and two 8’ wide insulated garage doors.
I went a bit crazy on the blown in cellulose. 24” thick in the ceiling and blown in the walls.
It’s 30,000 btu and more heat than I can use but the easiest way to heat the garage.
I use a 20 pound propane tank that is connected with a 10’ hose made to run to a bbq grill or camp stove.
I don’t run it 24/7. Only when I’m going to be working.
Yes. The cylinders are in the garage.
Yes it has a fan.
The switch can be flipped to run the fan continuously or when the thermostat kicks in and the heat kicks on. Once up to temperature the fan shuts off, the radiant heat stops and the pilot stays lit until the temperature drops and it automatically fires up the radiant heat and fan kicks on.
It really works pretty good. I used it in a 30 foot camper during the winter where we lived while I was building the house.
Once the house was complete I put it in my garage in 2012 so I’ve definitely got my $159.00 (2011) out of it.