"Beware psychopaths and over-enthusiastic barbequers with this weapon. Fine for use in South East Asia, but on the streets of Vice City, it's nothing but a menace."
―GTA Vice City Website.
The Flamethrower is a mechanical device designed to project a long controllable stream of fire. This weapon has appeared in every Grand Theft Auto game from the first Grand Theft Auto to the last game in the 3D Universe and GTA: Chinatown Wars. It is classified as a Heavy Weapon in the later editions. The Grand Theft Auto III rendition of the flamethrower is based somewhat on the US Army M2 Flamethrower, albeit lacking a backpack fuel tank, and adopting a rifle-like design. The renditions after GTA III are not based on any known flamethrower design, but they may be home-built.
The flamethrower can do damage over a large area. Any vehicles or pedestrians will be instantly set on fire within range. Most pedestrians usually die when lit on fire and only the healthiest car will survive the fire. Fire can be put out by the fire hose on a Firetruck or, in GTA San Andreas, with a Fire Extinguisher. Special vehicles that are fireproofed will be immune from damage from the flamethrower. It is one of the two only weapons that can destroy a Rhino.
The flames from the flamethrower will only damage vehicles and pedestrians. In GTA San Andreas only, the flames can be created on the ground and can spread, making the fire extremely hard to put out if one is started with the flamethrower, even if only one little flame was made to start out with. The flames on the ground will not affect pedestrians but can affect vehicles and the player. If a pedestrian catches on fire, the pedestrian will usually run wildly until his or her death.
If you activate the flame thrower in front of a mirror, the fire will not show up on it.
Harwood, Portland Island - On roof of the Head Radio building. It will be on a block-like object. This object is too high for the character to jump on, so you must plan accordingly in order to get there. A Hidden Package will be nearby.There is a Video here
Hideouts - Available after extinguishing total 20 fires on each island in the Firefightervehicle mission. It should be noted the Flamethrower can be obtained very early in the game, provided the player get to Staunton Island by jumping the girder and steel beam on the broken Callahan Bridge (both left and right side). Since Shoreside Vale is not locked at this point the in game, the player can easily drive to it using either the Subway or the Porter Tunnel. He can then complete the 20 firefighting missions there, come back, do the same at Staunton before going back to Portland. This will make the Flame Thrower appear even if the player haven't completed any missions in Portland.
Starfish Island - In the swimming pool of the Rockstar House northwest of the Mansion.
Viceport, Vice City Mainland - By the building near the road in the southwest part of Viceport, south of the Viceport Pay 'n' Spray. From the Viceport Pay 'n' Spray, head south along the road. As you near the road curve going east, you should see the weapon icon to your right.