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There are some definite disadvantages to cast iron for outdoor fireplaces. Iron is heavy, it rusts, and it will stain just about any surface it touches when it rusts. But when it comes to outdoor fireplaces, these disadvantages may not really be a big problem.
If you buy a fireplace, one of the last things you want is for it to rust through and fall apart. Iron is well know for being very susceptible to rust, especially when exposed to weather and fire. The rust can be stopped or slowed by coating the metal with heat resistant paint, but that usually is not really necessary. When iron is cast, it is usually cast into thick pieces. The surface of the iron will no doubt rust, but it can take a very long time for the rust to make it all the way through the thick iron. Until that happens, you can get many years or decades of enjoyment out of your fireplace.
So maybe the rust is not going to make the fireplace fall apart any time soon, but rust will stain your patio or deck. This may be a problem with a concrete patio but as far as your deck, that is the least of your problems. A deck is really no place for a wood burning fireplace. Since decks are usually made of wood, and wood burning fireplaces burn wood, it is not a good idea to put the fireplace on a wood deck to begin with. When a cast iron fireplace is put on the ground, where they belong, rust stains should not be a problem.
Cast iron is usually quite heavy. This can be a disadvantage if you want a portable fireplace. But if you want to leave it in one spot, being heavy will help it stay there.
Although cast iron may have some disadvantages over other metals for outdoor fireplaces, these disadvantages often do not really matter that much and the low cost and durability of cast iron can make it a good choice for fireplaces.
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