I have a wood-burning fireplace and would like to install a fireplace insert. Our house is heated with gas. I am looking for options that will operate if, as happened last year, we are without power for a week. I like the idea of using gas so that I don't have to purchase/store fuel as would be required with pellet stoves. Are there any gas options that would work? If not gas, what would be the best fuel/insert type? Our house is 2100 square feet so options that could achieve 30-50k btu would be good.