Power Nodes, unlike most other items bought/collected in-game, do not take up any space in the player's inventory no matter how many nodes they have, and are instead tracked by their respective counter. They can be used to upgrade player equipment, or to unlock 'emergency supply rooms' which contain random items. They can also be purchased at the Store for 10,000 credits, but cannot be sold back. However, this is less likely on harder difficulties (enemies are tougher and have more armor), so you should focus on more effective weapons.Power Nodes are uncommon items that can be found scattered around the environment, usually in their special solid blue wall lockers. The saving grace about the flamer is its ability to lay down several fire traps in a narrow corridor and let Necromorphs suck up fire damage until they explode.

The fuel is cheap, but the weapon is limited to an atmosphere - if you take Isaac out into a vacuum, the flamethrower - and the ammunition it uses - becomes the largest piece of un-used crap in your inventory. In Deadspace, the flamer is a makeshift weapon used for welding. In a spaceship, a flamethrower is effectively a suffocation weapon (like poison gas) since it can burn up more oxygen than what O2 cyclers or plants can replenish. IGN would like to take time out now to remind the sole reason Ellen Ripley could use a flamethrower in Alien 2 (James Cameron's Aliens) is because she was on a planet. Note if you put weapons into storage and end a chapter, it will only have 1 unit of ammunition when you pull it out of storage in the next chapter. The tutorials will not cover the use of weapons. This section will cover the basics of the weapons in the original disc-game (and none of that downloadable crap), as well as the special abilities you get in 5 to 10 minutes into the game Kinesis and Stasis).

Dead space 2008 wiki