This module allows the player to take heat damage when standing on a heated metal block (iron or gold block with fire under it). This module only works in survival and adventure gamemodes. It will not work with non-heated metal blocks.
I will probably make it so that you catch on fire instead of instant damage.

One Command Module (paste the command into a command block) : http://pastebin.com/pkNWND5Y
You might have to reset the redstone block clocks after the module has spawned. To do so, locate any red wool block or redstone block, break it and replace it by a redstone block.

The command was created using gentlegiantJGC's mcedit filter
(http://www.mediafire.com/view/zy2bkckvb9jk5ww/one-command_structure_spawner_2_0.py%20)

Enjoy ;)