This module allows the player to take heat damage when standing on a lit furnace. This module only works in survival and adventure gamemodes. It will not work with unlit furnaces.
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/x0ip5nUQ
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)

Enjoy ;)