This boss appears in episode 5 and has over 3000 health. He is resistant to normal weapon's and fire weapon's. He is vulnerable to poison frost and electric. He appears on grove street 3. When kill him he drops a torch witch is a fire weapon.
Use ranged and frost poison and electric weapons when fighting him.
As a side note in episode 9 In Treatment in the lowest level in the first room there is a fire fighter zombie but he is not a boss.