A fireplace is not the way to heat. It heats at about a 10% efficiency and then while it is cooling you are losing heat.
If you have a fireplace and burn firewood often I would be looking into modifying the hearth and looking into an EPA approved wood stove which gets a minimum of 63% and up to 73% efficiency in some models or a fireplace insert with a blower.
If you are not that concerned about the looks of the unit. You could get a payback period in one year.
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