artfox wrote:Local grocery stores sell bundles containing 3 pieces of split oak firewood for 5 bucks.
That could get expensive as as a heating source. Naturla gas is what $1.25/therm which is 100,000BTU's. What will that wood last, 8 hours. So figure 30,000 BTU's net output or 240,000 BTU's for 8 hours. So roughly 2X the cost to operate.
Something to consider Obivosuly you can get wood cheaper, expecially if you own acreage with timber or can source it pretty cheap locally in larger quantities.
I may install a wood firepalce some day just to have a nice cozy fire in the living room on a cold weekend morning. It would be direct vent. Natural draft firepalces can actually draw out so much air that their efficiency number are actually negative. I've seen -10 - 10% estimated.