Its electric-like body can enter some kinds of machines and take control in order to make mischief.
– Pokemon Black/White Pokedex
Heat Rotom got its type changed to Electric/Fire in Gen V, making it the only Pokemon with such a type combination. It’s actually a pretty good type combination, especially because Rotom has Levitate to counter its otherwise 4x weakness to Ground, making it only weak to Water and Rock. And because it’s part Electric, it can counter Water types.
Heat Rotom is based on a microwave oven. Its aura-hands look like oven mitts. Its special Form Change move is Overheat, which is good for like one or two uses. Though with Gen V’s new Electric move of Volt Switch, it can switch out and reset its Sp Attack decreases.
Stat-wise, it has good Sp Attack, and pretty good Defenses. With Heat Rotom’s typing, it can make a pretty good defensive or support Pokemon as well as an offensive one. Rotom can learn both Light Screen and Reflect, making it a good team supporter. I had a Heat Rotom that I used in single battle subway, as Light Screen/Reflect support for Shell-Smashing Cloyster. The combination was pretty effective.