Converting Back to LP as Primary Heat Source.

[Diggin It]

I'll have to look at options at some pint, but some of the FPs I've seen are over $1,000 which ain't gonna happen. Web shopping isn't best for this and stores don't have them yet as they're seasonal.

Exterior walls are concrete block, so while I could drill for a drain, I don't really want to.

I also have one wall mount infrared plaque LP heater that cycles on and off. I would need whatever I select to do that.

I might have to work up a faux FP using another plaque heater or maybe one of the blue flame units.

 

[Jack Murdock]

For every gallon of LP or natural gas you burn with a vent free appliance you put that much moisture back into the atmosphere. Here in upstate NY the winter that isn't usually an issue. VF fireplaces or heaters should never be used as a sole source of heat and should always have a " oxygen depletion system" when used indoors. I burn wood ( 5-7 cords per year ) have LP high eff hot air furnace and a VF heater in my basement office. 1 gallon of propane equals 92,516 BTU so you can divide that by the input of the appliance to see how much moisture is going into the air. A 30,000 btu VF fireplace puts 1/3 of a gallon of moisture into the air per hour.

 

[Oaktree]

So much depends on fuel prices where you live. In this part of the country, propane is hideously expensive, and you're tied to one supplier (and most suppliers won't fill a tank they don't own). As the OP mentioned, wood is generally reasonably priced to "free", but it's a lot of work and if you use a wood stove (as opposed to an outdoor furnace) it's messy. One big advantage is that if you use a woodstove, you have heat even when the power goes out.
Pellets are popular here, but most everyone I know who uses them complains about the noise and maintenance issues.
I'd say oil is probably the most popular here in New England if you don't have city gas, but that seems to be a northeast thing.

As others have noted, I wouldn't use a non-vented heater as anything but an emergency heat source.