From Lexicanum

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The Inferno Gun is a massive ordnance weapon designed to be mounted on Warhound Scout Titan, it consisted in three linked heavy inferno guns firing highly flammable chemicals. The very high pressure allowed by the Titan class power plant allows the burning liquid to be propelled a significant distance further than a standard inferno gun. The weapon is primary designed to deal with infantry deployed either on open field or in heavy cover.

Sources

Flame Weapons

Imperium	Brazier of Holy Fire • Combi-Flamer • Exterminator • Flamer • Heavy flamer • Inferno cannon • Inferno gun • Incinerator
Chaos Space Marines	Combi-Flamer • Flamer • Heavy flamer
Tau	Flamer
Orks	Burna • Kombi Shoota-Skorcha • Scorcha
Eldar	Dragon Breath Flamer • Flamer