Since this word is made up of a single kanji, it uses the kun'yomi reading. When learning the kanji, you didn't learn that reading, so here's a mnemonic to help you with this word:
What comes off of fire? Lots and lots of heat (ひ). Feel it coming off the fire, touching and warming your face.
Please put the fire out soon.
Have you ever started a fire with stones?
The fire burned off all of his hair.