Hello forum. I have an old vigilant. It came with the house.I have been burning wood in it for 8 years. Works good. The original owner told me he burnt coal in that stove for many years. H said it heated the whole house. I would like to try coal. The stove has glass in the doors. It has 1977 under the shell inside. I looked on the side and that little hole with the metal cover is oval. So mine is the vigilant 11 ? He told me to look in the barn, the grate should be up there. I haven't found it yet. Could I just get another grate and start using coal? Thanks. Filix.