Help me stat a steam thrower weapon

[Green-Neck]

Hello fine folks,

My GM is going to run a post apocolyptic game and I'm trying to give my character an intersting weapon. The campaign is semi cinematic and set in nearish future australia.

I'm imagining a weapon that looks much like a ww2 flame thower, except it uses solid fuels like wood and coal to heat water to superheat steam.

I'm thinking of a 30 pound backpack with wand
A brazier that preheats a water tank, then fills a one quart steel tank that heats to about 250 C/480 f, thats about 40bar/600 psi.

The tank would have a temperature solinoid and thermo-electric-generator powered fan to moderate the fire.

My attempt at stating it so far:

Steam Projector,
0-1 yards, 4d cutting pi-
2-5 yards, 4d burn 1x1 cone.
6-8 yards, 2d burn 2x2 cone.

30 lbs, 10 shots, fire 1 per 3 rounds.
Reload 10 litres/quarts water, 2lbs/1kg coal or wood.
Bayonet, for inevitable complications between steam charges.
skill: liquid projector (steam), spear.


I'd welcome any thaughts on semi-realism and more refined stats.

Thanks.