The steam cannon outputs a continuous steam of hot steam until your steam is exhausted. The damage is heat so when used on brains with heat shields you will see the red shield being activated.
It can be upgraded using a weapon kit. When upgraded, the name and appearance of the gun will change along with increased damage output. The upgraded versions are mark II and mark III.
How to Obtain
It can be crafted or traded. It is the highest weapon that can be crafted by non-premium players.
You can use it to attack turrets, mobs, or other players, to celebrate, and to do your ironing.