Martel732 wrote:All versions are highly overcosted
atm, making them ineffective.
Unfortunately, this seems to be the case more or less across the board, with any flamer-like weapon.
If you're interested in a flamer tank for imperial fists you might consider the relic deimos version from forgeworld. The infernus cannon is extremely dangerous if you can get it into range of things. It comes to just over 180 points, if you give it flamer sponsons.
I think flamer tanks are pretty questionable. The difficulty is that they have to go near to the enemy, where they are at a lot of risk. It's often better to get the same results by using massed dakka from a safe distance.