Regular basic vented natural gas or propane heaters wall require no
electricity. I have one in the garage, and though it's old, it brings in
combustion air from outside so paint and gas fumes aren't quite as much of a
worry. As Randall points out, it's straight convection, but if you had a
couple of them at opposite ends, it should be enough to keep the frost out.
As far as an unvented heater, remember that water is still a huge component
of the combustion products, and even if it's relatively clean-burning, it'll
still put lots of moisture into the building. Even if the building isn't
all that tight, humidity is still going to build up and that's not a good
thing for your vehicles and tools, not to mention the structure.
Karl
>> Around here, you never
>> know when there's going to be an ice storm or something that
>> leaves power out for days.
>
> Dunno if they are still around, but there at least used to be several
> options for vented heaters that did not require AC power for operation.
>
> The fuel oil version used gravity feed from the storage tank to a 'pot
> burner', and relied on convection to move the air around. Not the most
> efficient thing, but effective.
>
> -- Randall
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