The Blast Furnace is OSRS’s best Smithing training method and one of the few ways to smelt bars at half the coal cost, which makes it a significant GP/hour saver for high-level accounts. It’s located in Keldagrim — a dwarven city that requires a short quest to unlock.
- Located in Keldagrim, the dwarven capital beneath the north-eastern mountains
- Requires starting The Giant Dwarf quest (short, low requirements) to access Keldagrim
- Fastest travel: Blast Furnace minigame teleport (free, via Grouping interface) or minigame teleport crystal
- Worlds 352, 355, 358, 361, 364, 367, 370 are official Blast Furnace worlds with an active foreman
- Using the Blast Furnace saves 50% coal on all bar types — massive impact at high volumes
How to Get to the Blast Furnace in OSRS
The Blast Furnace sits inside Keldagrim’s factory district. Accessing Keldagrim for the first time requires beginning The Giant Dwarf quest — specifically, taking the boat from the Mines east of Rellekka. You only need to start the quest (board the boat), not complete it, to unlock Keldagrim access permanently.
After your first visit, travel options are:
- Blast Furnace Minigame Teleport (Grouping interface) — free, 20-minute cooldown per teleport. Fastest option for most players.
- Minigame Teleport tab (craftable via Lunar Spellbook or bought on GE) — direct teleport with no cooldown restriction.
- Dwarven Boatman east of Rellekka — take the boat from the Mine entrance; accessible any time after initial quest start.
- Grand Exchange tram (after first visit) — there’s a tram station in the Grand Exchange basement connecting to Keldagrim.
- Teleport to Trollheim then run down and east — works but is slower than the above.
ℹ️ Always use an official Blast Furnace world (BF worlds listed in the Grouping interface). On these worlds, the Blast Furnace runs permanently and is maintained by dwarven workers — you don’t need to manually operate it.
Blast Furnace Setup and Costs
The Blast Furnace charges a fee of 72,000 GP per hour on official worlds (paid automatically from your coin pouch). This covers the NPC operators who keep the machine running. On non-BF worlds, you either need 60 Smithing to operate it yourself or must find other players to cooperate.
Recommended inventory setup for an efficient run:
- Coal Bag (bought from Motherlode Mine store for 100 nuggets) — doubles coal efficiency dramatically
- Ice Gloves or Bucket of Water — required to take bars from the conveyor belt without burning your hands
- Stamina Potions — the BF area involves a lot of running; keep energy topped up
- GP stack for hourly fees and bar purchases
| Bar | Smithing Level | Coal Needed (BF) | Normal Coal |
|---|---|---|---|
| Steel | 30 | 1 | 2 |
| Mithril | 50 | 2 | 4 |
| Adamantite | 70 | 3 | 6 |
| Runite | 85 | 4 | 8 |
Steel bars at Blast Furnace are a popular money-making method for mid-level accounts — minimal inputs, fast cycle, consistent GP/hour around 300–500K depending on the market.
OSRS Blast Furnace FAQ
Below are the most common questions about accessing and using the Blast Furnace in OSRS.
What Quest Do You Need for Blast Furnace?
You need to start The Giant Dwarf — specifically, travel with the Dwarven Boatman from the entrance east of Rellekka to reach Keldagrim. The quest itself requires 14 Thieving, 12 Crafting, 16 Firemaking, and 33 Magic, but the boat trip that unlocks Keldagrim access can be taken before completing those steps.
What Is the Best World for Blast Furnace?
Official Blast Furnace worlds (352, 355, 358, 361, 364, 367, 370) have active foremen who keep the machine running. World 358 tends to be the most populated and has the fastest bar cycle due to active players. Any of the official worlds work well.
Do You Need 60 Smithing for Blast Furnace?
Not on official BF worlds — the NPC foreman handles operation. On non-official worlds, you need 60 Smithing to operate the machine yourself. For consistent, efficient training, always use an official BF world.
How Much Does the Blast Furnace Cost per Hour?
The foreman fee is 72,000 GP/hour on official worlds, deducted automatically from your gold. At the GP/hour rates BF offers (often 300K–600K+), this fee is trivial. Budget for it in your session and keep at least 72,000 GP in your coin pouch at all times to avoid being kicked.
What Level Should I Start Blast Furnace?
30 Smithing (Steel bars) is the earliest practical entry point. Most players start at 40+ for Iron bars (no coal required, very fast) and switch to Steel at 30 or higher tiers as they level. The XP rates at Blast Furnace are among the best in Smithing from level 30 all the way to 99.
The Blast Furnace rewards players who commit to learning the rhythm — load, run, collect, repeat. Once the cycle is in muscle memory, it’s one of the most efficient skilling loops in the game.