The heater is a tier two tank, and upgrades from the basic tank. It gains a new type of barrel. Instead of shooting bullets, the barrel emits a warm glow. Getting near a player of polygon with the tank will cause it to burn, and will slowly lose H.P. Moving away from the polygon won't stop the burning effect, although it will lose H.P. more slowly. Good for farming, but bad against high penetration tanks or high regen tanks.