We have a fireplace where the chimney has been sealed off. We are considering a gas insert but want to try to do a bit of a cost benefit analysis regarding heating costs. We have hot water radiator heat now and this would supplement the heat in the area that we spend the most time in. Thanks!
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By gas fireplace I am hoping you are not referring to a vented gas log fireplace. If that is the type you are referring to than save your money and your gas. Gas logs are notoriously inefficient and worse yet they require that the damper is to be blocked open all the time (yes, that means even when you are not using it). When you are using a vented gas log it run at 10% efficiency and will burn in 3 hours what a furnace will burn in a day. I took my vented gas log in the basement out and plugged the damper with a chimney balloon to seal it nice and tight, and now I just burn candles in there every once in a while.
Now, If you are referring to putting in a direct vent fireplace or stove you are on to something…These direct vent units work like a direct vent furnace and create very usable and efficient heat especially if you are looking for zone heating for one main room. My sister has a direct vent stove that heats a 1500 square foot apartment with 12 foot ceilings and cold brick walls, and it does it for a reasonable cost. Her therm consumption is slightly over mine, But I have a 1200 square foot ranch with a power vent furnace and ducts.
So the moral of the story is gas logs=bad, direct vent stove or fireplace = good.
Nice to look at, but a lot of the heat goes up the chimney
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