It cooks Items 1 and a half times as fast as the usual furnace.
It cooks Items twice as fast as the usual furnace.
It cooks Items 4 times the usual speed!!!
Fuel Efficiency Upgrade
Put it in one of the Upgrade Slots to double the amount fuel is worth (equivalent to the old EnderFurnace)
Ore Processing Upgrade
Put it in one of the Upgrade Slots to double the amount ingots you get from ores (works on most ores, the only modded ores working are: Copper, Tin, Silver, Lead)
Put it in one of the Upgrade Slots to enable the use of any fuel for the buildcraft combustion engine (in buckets or capsules) -> 1 bucket of buildcraft fuel burns 3000 Items
Shift click with it on a Better Furnace to enlarge it’s internal Storage (2 Input, 2 Output and 2 Fuel Slots)