Bronze as a holder of an always burning fire
(not sure about the flair)
In my fantasy novel, that is not on real earth but on an unnamed Earth like world, I have temples that have fires that are never put out but once a year. I say in the book they are small but never imply actual size. I am editing that book as I rewrite it (again) and see I said it was bronze.
Could bronze work for being hot all year around? The year in this novel is 484 days so for all but a few minutes once a year, it is always burning. The fuel is some sort of oil. I thought of making it a holy fire but that seems to be a big much.
The society is advanced enough to make steel armor. No combustion engines but they do use things such as water wheels, weights, and pulleys, horse or oxen pulled agricultural machinery. That's their technology level.
Would bronze work or should it be another metal? Cast iron came to be in the 1500s which would line up technology wise. But bronze is prettier for the temple.
The things I get stuck on.