Ana rarraba kofofin wuta bisa ga juriya na wuta kuma ana iya raba su zuwa: Ƙofofin wuta masu hana zafi (Class A), Ƙofofin wuta masu hana zafi (Class B), da kuma Ƙofofin wuta marasa rufi (Class C). Akwai maki juriya guda uku da aka saba amfani da su don ƙofofin wuta na thermal: Grade A (1.5h), Grade B (1.0h) da Grade C (0.5h).