How to Do Blast Furnace in OSRS: Ultimate Guide for 2025
If you’re looking to level up your Smithing skill or make some serious gold in Old School RuneScape (OSRS), the Blast Furnace is one of the best methods available. Located in Keldagrim, this members-only minigame offers efficient smelting with half the coal requirement of regular furnaces, making it a go-to for both XP grinding and profit. In this comprehensive guide, we’ll walk you through everything you need to know about how to do the Blast Furnace in OSRS, from requirements to strategies, updated for 2025. Whether you’re a newbie or a seasoned player, this guide is packed with tips to maximize your efficiency!
Before you can dive into the Blast Furnace, there are a few prerequisites and preparations to cover. This section will ensure you’re ready to smelt like a pro.
Requirements to Access the Blast Furnace
To use the Blast Furnace, you’ll need to meet these basic requirements:
- Start The Giant Dwarf Quest: Speak to the Dwarven Boatman east of Rellekka to unlock access to Keldagrim. You don’t need to complete the quest—just start it.
- Membership: The Blast Furnace is exclusive to OSRS members.
- Smithing Level (Optional): While you can use the furnace at any Smithing level, having level 60 eliminates the 2,500 GP fee every 10 minutes.
- Gold Coins: You’ll need 72,000 GP per hour on official Blast Furnace worlds, plus the optional 2,500 GP fee if below 60 Smithing.
Recommended Gear and Items
To make your Blast Furnace runs smooth and efficient, equip these items:
- Ice Gloves: Obtained from the Ice Queen under White Wolf Mountain, these let you pick up hot bars instantly, saving time over using a bucket of water.
- Coal Bag: Purchase this from Prospector Percy’s Nugget Shop (100 golden nuggets from Motherlode Mine) to carry 27 extra coal per trip.
- Goldsmith Gauntlets: Essential for smelting gold bars, boosting XP from 22.5 to 56.2 per bar. Get these from the Family Crest quest.
- Weight-Reducing Gear: The Graceful outfit or items like Boots of Lightness and Spottier Cape reduce run energy drain.
- Stamina Potions: Keep your run energy topped up for constant movement.
How to Reach the Blast Furnace
Getting to the Blast Furnace in Keldagrim is straightforward once you’ve unlocked the city. Here’s how to do it efficiently in 2025.
Travel Options to Keldagrim
You’ve got several ways to reach the Blast Furnace:
- Minigame Teleport: After visiting Keldagrim once, use the Grouping tab to teleport directly outside the Blast Furnace building.
- Minecart: Travel from the Grand Exchange or Dwarven Mines under Ice Mountain to Keldagrim, then walk east to the furnace.
- Fairy Ring (DKR): Teleport near the Grand Exchange, use the underwall tunnel (21 Agility), and take the minecart.
- Fairy Ring (DKS): Teleport near Rellekka and walk southwest to the Keldagrim entrance (slower option).
Official Blast Furnace Worlds
For solo efficiency, use these designated worlds where dwarves operate the furnace for you (cost: 72,000 GP/hour): 352, 355, 358, 386, 387, and others like 395, 424, etc. Check the latest OSRS world list for updates in 2025.
Blast Furnace Mechanics: How It Works
Understanding the Blast Furnace’s mechanics is key to mastering it. Here’s a breakdown of the process and how to optimize your runs.
The Smelting Process
The Blast Furnace smelts ores into bars instantly, requiring only half the coal of a regular furnace for coal-using bars (e.g., steel, mithril, adamantite, runite). Here’s the basic flow:
- Deposit coins into the coffer (72,000 GP/hour on official worlds).
- Place coal and/or ore onto the conveyor belt.
- Wait for the bars to smelt (near-instant on official worlds).
- Cool the bars with Ice Gloves or a bucket of water.
- Collect bars from the dispenser and bank them.
- Repeat!
Coal and Ore Ratios
Different bars require specific coal-to-ore ratios at the Blast Furnace:
| Bar Type | Ore Needed | Coal Needed | Smithing Level |
|---|---|---|---|
| Bronze | 1 Tin + 1 Copper | 0 | 1 |
| Iron | 1 Iron | 0 | 15 |
| Steel | 1 Iron | 1 | 30 |
| Mithril | 1 Mithril | 2 | 50 |
| Adamantite | 1 Adamantite | 3 | 70 |
| Runite | 1 Runite | 4 | 85 |
| Gold | 1 Gold | 0 | 40 |
Best Blast Furnace Strategies for XP and Profit
The Blast Furnace offers flexibility depending on your goals—XP or gold. Here are the top strategies for 2025.
Gold Bars for Maximum XP
Smelting gold bars with Goldsmith Gauntlets is the fastest Smithing XP method in OSRS, offering up to 400,000 XP/hour at peak efficiency.
- Setup: Equip Goldsmith Gauntlets, carry Ice Gloves and Stamina Potions, and bring 27 gold ore per trip.
- Method: Deposit ore, wait for the XP drop (keep gauntlets on), switch to Ice Gloves to collect bars, bank, and repeat.
- Pros: Insane XP rates; great for 99 Smithing.
- Cons: High cost (no profit—expect losses of 500K–1M GP/hour).
Runite Bars for Maximum Profit
Smelting runite bars is the most profitable Blast Furnace method, netting up to 1–1.2M GP/hour depending on GE prices.
- Setup: Use a Coal Bag, Ice Gloves, and Stamina Potions. Bank 4 coal and 1 runite ore per bar.
- Method: Preload 54 coal (two trips), then alternate coal and runite ore trips (e.g., 27 coal, 27 runite). Collect bars each trip.
- Pros: High profit and decent XP (~70K/hour).
- Cons: Requires 85 Smithing and significant starting capital.
Hybrid Method: Gold + Mithril/Adamantite
For a balance of XP and profit, combine gold with mithril or adamantite:
- Setup: Coal Bag, Goldsmith Gauntlets, Ice Gloves, 26 gold ore + 26 coal first trip, then alternate with mithril/adamantite.
- Method: Smelt gold with gauntlets, switch to Ice Gloves for bars, then use coal with other ores. Expect ~200K XP/hour and 600–800K GP/hour.
Tips and Tricks for Blast Furnace Success
Maximize your efficiency with these expert tips tailored for 2025 OSRS gameplay.
Optimizing Run Energy
Running is constant at the Blast Furnace, so conserve energy:
- Wear full Graceful or mix with Spottier Cape and Boots of Lightness.
- Sip Stamina Potions (decant to 1-dose for quick use).
- Boost Agility for faster energy regen.
Managing Costs
Keep expenses low with these hacks:
- Use the Ring of Charos (a) to halve the 2,500 GP fee (chat option 1-3-2-3 with the Foreman).
- Buy ore from Ordan’s shop when stock is high (cheaper than GE).
- Smelt on non-BF worlds to avoid the 72K GP/hour fee (requires manual operation).
Increasing Efficiency
Small tweaks can boost your output:
- Preload coal (e.g., 27–54) before adding primary ore to avoid delays.
- Use the bank chest one click away from the conveyor belt.
- Shift-click the Coal Bag to empty it faster onto the belt.
With this guide, you’re fully equipped to tackle the Blast Furnace in OSRS in 2025. Whether you’re chasing 99 Smithing or stacking gold, this minigame is a powerhouse. Start smelting, experiment with strategies, and watch your skills and bank grow!