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It creates balls of fire which can ignite foes from a distance, unlike its sibling, the flamer, which requires the user to be in close proximity to a target. The heavy incinerator shoots considerably faster than the normal incinerator. Its rate of fire is equivalent to the heavy incinerator in Fallout 3. Note that this weapon has a long range like the sniper rifle making this an effective long ranged artillery weapon. However it does take some skill to use it well at longer ranges, due to the flame's trajectory. It is also very accurate at short ranges if aimed correctly.
The heavy incinerator can fire a total of about 995 times using standard fuel, the equivalent of 42 reloads, from full condition before breaking. The flamer and incinerator also fire exactly the same amount before breaking.
pc In V.A.T.S., it fires in a burst of three shots, but only uses one unit of ammunition. [verified]
xbox360 When getting an incinerator to repair the Heavy Incinerator it some times it may not let you repair it. Removing both weapons from your inventory will fix this problem. [verified]