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Rocket heater in my fireplace?

Posts: 2
Location: Williamston, NC
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Hello folks, new guy here. Been lurking around for a while absorbing what I can here.
I have an open fireplace in my 1800 sq/ft home. As we all know a lot of wood is burned and not a lot of heat is transferred in the home. My LP powered furnace is what keeps the house warm but it's using more LP than I would like. I would like to know if I could benefit from putting a rocket heater in my firebox. I have an old 14 gallon water pressure tank with a busted bladder. The diameter is 15" with a height of 26". I am up to suggestions on size of burn tube and what I should use for a riser. I thought about using fire brick or 4" square tubing. Everyone keeps saying that the metal will deteriorate but is there a way of knowing how long it will last?
But, most of all, the question is would I benefit from doing this or should I just add some sort of pipe grate with a fan to my existing firebox? Keep in mind it will sit in the firebox. I don't want my little girl getting her hands on it.
Posts: 3204
Location: Southern alps, on the French side of the french /italian border 5000ft elevation
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Check the end of this thread, and my sketchup drawings.

There's plenty of other ideas.

Metal in contact with the flame is doomed. I killed 3/8" thick tube in 14 burns.
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