My recollections are very rough. I read it at the latest in the mid 90s, which means it would most likely written before that. It involved the main protagonist who initially discovers he has the power to control fire (Which is rare but not impossible - someone refers to him as a "Firebrand") but eventually discovers has a more broad elemental powers.

He gets together with other people with these powers to overthrow some sort of evil.

I remember multiple books, none particularly large.