|Data Value||650 (off), 651 (on)|
One Demon Furnace can be obtained by trading with Datticon for 9 Arcanium.
The Demon Furnace smelts items incredibly fast and does not require fuel, so it is much better than a regular furnace if you can get your hands on it.
The Demon Furnace also starts fires on adjacent blocks quite often.
WARNING: Because this furnace starts random fires in adjacent blocks, use it away from flammable blocks!