The initial ability seems pretty tame really. It is useable all day long sure, but 3d6 damage only useable within 60' for a touch attack.
At level 8 that is pretty wimpy

The later on one is pretty strong however.. but even 10d6 to one target once per turn might not be too bad.. hard to say.. it is a pretty limited class in scope, it is very specific.
The heat death though is a bit over the top. At least it would be really difficult to do it every turn right?
You need to have a decent amount of pp in reserve for the class, otherwise loseing just a few will cause you to lose access to all class features.
The heat death should probably cost a couple of pp each time, just to make it that much more difficult to use.
It also does not continue gaining any other class features (like pp or manifester levels). Against anyone with a simple 'fire immunity' spell up he might as well go home.
But still, the main point of the thread was the bolt of fire.
When it first starts out i see no problems really. 8th level, 3d6 touch attack as a standard action, vs him just being able to use his firelash to do 1d8 + 2d6 as a touch attack which can be enhanced through feats and can use it with iterative attacks.
still, it may be too strong once it starts hitting those higher numbers, but the initial one seems fine at least
Stupid heat death..lol