We had a cast iron log burner. When renovating our house it was left outside under a plastic tarpaulin. At the end of the building process it was completely covered in rust inside and out. It took hours with an angle grinder to remove all the rust, it then needed repainting with fireproof paint and for good measure all the seals replacing.
So if you thinking of leaving it outside it will get fucked up fast.
That will rust like a motherfucker.
We had a cast iron log burner. When renovating our house it was left outside under a plastic tarpaulin. At the end of the building process it was completely covered in rust inside and out. It took hours with an angle grinder to remove all the rust, it then needed repainting with fireproof paint and for good measure all the seals replacing.
So if you thinking of leaving it outside it will get fucked up fast.