The Whiteout Survival Furnace upgrade requirements become increasingly demanding as your city develops. Every upgrade can require resources, construction time, and one or more prerequisite buildings before you can begin.
The Furnace also determines the maximum level of most other buildings. Important features such as the Command Center, Hero Gear, Chief Gear, Chief Charms, and Fire Crystal progression are tied to specific Furnace levels.
This guide lists the requirements for every standard Furnace level, explains the prerequisite pattern, highlights major unlocks, and shows how to prepare for Furnace level 30 and Fire Crystal upgrades.
What Does the Furnace Do in Whiteout Survival?
The Furnace serves as your city’s central progression building. Raising its level increases its heat output, adds building power, unlocks new structures and features, and raises the level cap of other buildings.
Its heat function also helps keep Survivors warm. During cold conditions and snowstorms, insufficient heat can make Survivors sick and prevent them from working until they recover.
Whiteout Survival Furnace Upgrade Requirements
Each Furnace upgrade has three main checks:
- Prerequisite buildings: Specific buildings must reach the required level.
- Resources: Wood, coal, iron, and eventually meat are consumed when construction begins.
- Construction time: Higher levels have much longer base timers.
Coal first appears when upgrading to Furnace level 4. Iron begins at level 6, while meat is first required for the upgrade to Furnace level 11.
| Target Level | Prerequisite Buildings | Meat | Wood | Coal | Iron | Base Time |
|---|---|---|---|---|---|---|
| 1 | Starting level | — | — | — | — | — |
| 2 | Sawmill Lv. 1 | — | 180 | — | — | 6 seconds |
| 3 | Shelter 1 Lv. 2 | — | 805 | — | — | 1 minute |
| 4 | Coal Mine Lv. 3 | — | 1,800 | 360 | — | 3 minutes |
| 5 | Hero Hall Lv. 1 and Shelter 3 Lv. 3 | — | 7,600 | 1,500 | — | 10 minutes |
| 6 | Iron Mine Lv. 5 | — | 19,000 | 3,800 | 960 | 30 minutes |
| 7 | Hunter’s Hut Lv. 6 | — | 69,000 | 13,000 | 3,400 | 1 hour |
| 8 | Infantry Camp Lv. 7 | — | 120,000 | 25,000 | 6,300 | 2 hours 30 minutes |
| 9 | Embassy Lv. 8 and Infirmary Lv. 1 | — | 260,000 | 52,000 | 13,000 | 4 hours 30 minutes |
| 10 | Marksman Camp Lv. 9 and Research Center Lv. 1 | — | 460,000 | 92,000 | 23,000 | 6 hours |
| 11 | Embassy Lv. 10 and Lancer Camp Lv. 10 | 1.3M | 1.3M | 260,000 | 65,000 | 7 hours 30 minutes |
| 12 | Embassy Lv. 11 and Command Center Lv. 1 | 1.6M | 1.6M | 330,000 | 84,000 | 9 hours |
| 13 | Embassy Lv. 12 and Infantry Camp Lv. 12 | 2.3M | 2.3M | 470,000 | 110,000 | 11 hours |
| 14 | Embassy Lv. 13 and Marksman Camp Lv. 13 | 3.1M | 3.1M | 630,000 | 150,000 | 14 hours |
| 15 | Embassy Lv. 14 and Lancer Camp Lv. 14 | 4.6M | 4.6M | 930,000 | 230,000 | 18 hours |
| 16 | Embassy Lv. 15 and Research Center Lv. 15 | 5.9M | 5.9M | 1.1M | 290,000 | 1 day 6 hours 28 minutes |
| 17 | Embassy Lv. 16 and Infantry Camp Lv. 16 | 9.3M | 9.3M | 1.8M | 460,000 | 1 day 12 hours 34 minutes |
| 18 | Embassy Lv. 17 and Marksman Camp Lv. 17 | 12M | 12M | 2.5M | 620,000 | 1 day 19 hours 53 minutes |
| 19 | Embassy Lv. 18 and Lancer Camp Lv. 18 | 15M | 15M | 3.1M | 780,000 | 2 days 17 hours 50 minutes |
| 20 | Embassy Lv. 19 and Research Center Lv. 19 | 21M | 21M | 4.3M | 1M | 3 days 10 hours 18 minutes |
| 21 | Embassy Lv. 20 and Infantry Camp Lv. 20 | 27M | 27M | 5.4M | 1.3M | 4 days 10 hours 59 minutes |
| 22 | Embassy Lv. 21 and Marksman Camp Lv. 21 | 36M | 36M | 7.2M | 1.8M | 6 days 16 hours 29 minutes |
| 23 | Embassy Lv. 22 and Lancer Camp Lv. 22 | 44M | 44M | 8.9M | 2.2M | 9 days 8 hours 40 minutes |
| 24 | Embassy Lv. 23 and Research Center Lv. 23 | 60M | 60M | 12M | 3M | 13 days 2 hours 33 minutes |
| 25 | Embassy Lv. 24 and Infantry Camp Lv. 24 | 81M | 81M | 16M | 4M | 18 days 8 hours 22 minutes |
| 26 | Embassy Lv. 25 and Marksman Camp Lv. 25 | 100M | 100M | 21M | 5.2M | 21 days 2 hours 26 minutes |
| 27 | Embassy Lv. 26 and Lancer Camp Lv. 26 | 140M | 140M | 24M | 7.4M | 25 days 7 hours 43 minutes |
| 28 | Embassy Lv. 27 and Research Center Lv. 27 | 190M | 190M | 39M | 9.9M | 29 days 2 hours 52 minutes |
| 29 | Embassy Lv. 28 and Infantry Camp Lv. 28 | 240M | 240M | 49M | 12M | 33 days 11 hours 42 minutes |
| 30 | Embassy Lv. 29 and Marksman Camp Lv. 29 | 300M | 300M | 60M | 15M | 40 days 4 hours 27 minutes |
How the Furnace Prerequisite Pattern Works
The long requirements table becomes easier to manage once you understand its repeating pattern.
The Embassy is the main recurring requirement
Starting with the upgrade to Furnace level 9, the Embassy appears in nearly every subsequent requirement. From Furnace level 11 onward, it generally needs to be exactly one level below your target Furnace level.
For example, Furnace level 22 requires Embassy level 21, while Furnace level 30 requires Embassy level 29.
This makes the Embassy one of the safest buildings to prioritize during a Furnace construction timer. Keeping it behind can create an avoidable delay even when you already have enough resources for the Furnace.
The second requirement follows a predictable cycle
After the Command Center requirement for Furnace level 12, the second prerequisite follows this repeating order:
- Infantry Camp
- Marksman Camp
- Lancer Camp
- Research Center
The cycle begins with the upgrade to Furnace level 13 and continues through level 30. Checking which building comes next allows you to use your construction queues more efficiently.
Important Whiteout Survival Furnace Levels and Unlocks
Not every Furnace level has the same impact. Several milestones unlock buildings or progression systems that can significantly change how you develop your account.
| Furnace Level | Major Unlocks | Why It Matters |
|---|---|---|
| 3 | Coal Mine | Introduces coal production for later construction and heating. |
| 4 | Clinic, Explorer’s Cabin, Hero Hall, Shelter 3 | Opens several early city and hero systems. |
| 5 | Iron Mine and Shelter 4 | Adds the fourth standard construction resource. |
| 6 | Chief’s House and Shelter 5 | Provides access to useful Chief Orders. |
| 7 | Infantry Camp, Lighthouse, Barricade, Daily Missions | Begins troop training and expands regular progression activities. |
| 8 | Embassy, Arena, Marksman Camp, Infirmary, Monument | Unlocks alliance assistance, competitive content, and another troop type. |
| 9 | Storehouse, Research Center, Lancer Camp | Completes the three troop camps and unlocks permanent research. |
| 10 | Command Center, Shelter 7, Shelter 8 | Unlocks the building used to improve rally and deployment capacity. |
| 11 | Enlistment Office | Supports the recovery of troops lost under eligible conditions. |
| 13 | Drill Camp | Helps synchronize the levels of heroes placed in training slots. |
| 15 | Hero Gear | Introduces equipment progression for combat heroes. |
| 18 | Beast Cage and pet progression | Allows pet content once the required state-age conditions are also met. |
| 20 | Mastery Forging | Adds another progression layer to eligible Mythic Hero Gear. |
| 22 | Chief Gear | Unlocks equipment that improves troop combat attributes. |
| 25 | Chief Charms | Adds charm slots and another long-term source of troop attributes. |
| 30 | Fire Crystal upgrades | Begins post-level-30 building progression when available in the state. |
How Furnace Resource Costs Scale
Early Furnace upgrades are inexpensive and finish quickly. However, the requirements increase sharply after meat becomes part of the cost at level 11.
- Levels 2–3: Only wood is required.
- Levels 4–5: Wood and coal are required.
- Levels 6–10: Wood, coal, and iron are required.
- Levels 11–30: Meat, wood, coal, and iron are all required.
The final standard upgrade to Furnace level 30 requires 300 million meat, 300 million wood, 60 million coal, and 15 million iron. That is only the Furnace cost; you must also fund Embassy level 29 and Marksman Camp level 29 first.
For this reason, comparing only the Furnace row understates the real cost of progression. Your plan should include the resources and timers for both prerequisite buildings.
How to Upgrade the Furnace Efficiently
Efficient Furnace progression depends more on preparation than on immediately spending every speedup or resource item you receive.
1. Check the following Furnace level in advance
Before starting an upgrade, check the requirements for the level after it. This tells you which prerequisite buildings should be completed while the current Furnace timer is running.
Waiting until the Furnace finishes before checking the next requirement can leave your construction queue idle.
2. Keep the Embassy close to your Furnace level
The Embassy becomes a recurring requirement throughout the midgame and late game. Keeping it close to the Furnace also improves the number and effectiveness of alliance construction helps available to your city.
If the Embassy is several levels behind, catching it up can consume significant resources and construction time.
3. Follow the troop camp and Research Center cycle
From Furnace level 13 onward, prepare the required Infantry Camp, Marksman Camp, Lancer Camp, or Research Center according to the repeating cycle.
You do not need to guess which building will be required next. Use the requirements table to prepare it during your current Furnace timer.
4. Gather for the Furnace and its prerequisites
Avoid stopping your resource plan as soon as the Furnace cost is covered. Calculate the required Embassy and secondary building as well.
This becomes especially important in the level 20s, where the prerequisite buildings can represent a substantial additional resource and timer commitment.
5. Activate construction bonuses before starting
Long upgrades receive the most value from construction-speed bonuses. Before beginning a major Furnace or prerequisite upgrade, check whether you can activate:
- Construction-related Chief Orders
- Temporary state or minister bonuses
- Relevant pet skills
- Hero construction bonuses available to your account
- Alliance assistance from active members
Some bonuses must be active when construction begins. Review the current effect description in game before committing to a long timer.
6. Use speedups when they remove a real bottleneck
Speedups are most valuable when finishing the current building allows you to start the next important upgrade immediately.
For example, speeding up the Furnace may have limited value if its next prerequisite buildings are still several days from completion. In that situation, using speedups on the prerequisite may produce better overall progress.
7. Coordinate large upgrades with current events
Construction and power increases may contribute points during certain events. When practical, start or complete expensive upgrades during a relevant scoring phase.
Event schedules, point values, and eligible actions can change. Check the current in-game event panel instead of relying on an old rotation.
Should You Rush the Furnace?
Raising the Furnace quickly is generally useful because it unlocks higher building levels and major progression systems. However, an uncontrolled rush can leave your research, troops, prerequisite buildings, and resource economy far behind.
Recommended approach for beginners and F2P players
- Keep at least one construction queue working whenever possible.
- Prioritize the next Furnace prerequisites before optional buildings.
- Continue important Growth research, especially construction improvements.
- Save general speedups for genuine progression blocks or valuable event phases.
- Join an active alliance so members can provide construction assistance.
- Avoid starting a Furnace upgrade if you cannot prepare the next prerequisite during its timer.
Recommended approach for competitive players
Competitive players may hold the completion of major Furnace levels for construction or power-scoring phases. However, delaying too long can prevent access to stronger troop tiers, gear systems, or Fire Crystal progression.
The better strategy is to prepare the resources and prerequisite buildings first. You can then decide whether the event rewards justify delaying the final completion.
Evaluating Furnace Progression in an Established State
Players who want to join friends in an older state or compare alternatives to repeating early progression may look at a wos account for sale. Furnace level is a useful starting point, but it should not be the only factor considered.
Check the state number, heroes, Chief Gear, Chief Charms, Fire Crystal progress, transfer eligibility, account binding, and account security. A high Furnace level can still hide weak supporting progression if research, gear, or prerequisite buildings have been neglected.
Whiteout Survival Furnace Fire Crystal Requirements
Standard Furnace progression ends at level 30. Afterward, the Furnace advances through Fire Crystal ranks, provided that Fire Crystal progression has become available in your state.
Reaching Furnace level 30 alone may not be enough in a newer state. Fire Crystal content is also controlled by state progression, so check your Monument, Furnace panel, and current in-game announcements.
How Furnace level 30 becomes FC1
The transition from Furnace level 30 to Fire Crystal level 1 is divided into five upgrades:
- F30-1
- F30-2
- F30-3
- F30-4
- FC1
Each of these five stages uses the same listed resources and Fire Crystal amount.
| Requirement | Per Sub-Upgrade | Total to Reach FC1 |
|---|---|---|
| Prerequisite buildings | Embassy Lv. 30 and Research Center Lv. 30 | Same prerequisites |
| Fire Crystals | 132 | 660 |
| Meat | 67M | 335M |
| Wood | 67M | 335M |
| Coal | 13M | 65M |
| Iron | 3.3M | 16.5M |
| Base construction time | 7 days | 35 days |
The totals above cover the five Furnace stages from level 30 to FC1. They do not include the cost of upgrading the Embassy and Research Center to level 30.
Later Fire Crystal ranks continue to use standard resources and Fire Crystals. Higher progression eventually introduces additional materials, while exact availability depends on your state’s current age and unlocked content.
Common Furnace Upgrade Mistakes
Upgrading the wrong troop camp
The required troop camp rotates between Infantry, Marksman, and Lancer. Upgrading the wrong one may improve your city, but it will not remove the immediate Furnace requirement.
Ignoring the Embassy
The Embassy is required repeatedly and also improves alliance help capacity. Allowing it to fall several levels behind creates both a progression bottleneck and weaker construction assistance.
Saving resources only for the Furnace
You must complete the prerequisite buildings before the Furnace upgrade becomes available. A resource plan that covers only the Furnace cost is incomplete.
Using speedups before activating bonuses
Construction-speed effects should be checked before starting a long timer. Once construction is underway, activating certain bonuses may not recalculate the original duration.
Assuming every feature unlocks from Furnace level alone
Some systems also depend on state age or the rollout of new content. Pets and Fire Crystal progression are important examples. Check the current in-game interface if a feature does not appear at the expected Furnace level.
FAQ
What are the Whiteout Survival Furnace upgrade requirements?
Furnace upgrades require specific resources, prerequisite buildings, and construction time. Early levels use wood, coal, and iron, while meat is added when upgrading to Furnace level 11.
From the midgame onward, the Embassy and one rotating troop camp or Research Center commonly block the next Furnace level.
When does the Furnace start requiring meat?
Meat is first required when upgrading from Furnace level 10 to Furnace level 11. That upgrade requires 1.3 million meat and 1.3 million wood, plus coal and iron.
Which building is required most often for Furnace upgrades?
The Embassy is the most frequent prerequisite. It appears in the requirement for Furnace level 9 and then in every standard Furnace upgrade from level 11 through level 30.
Why is my Furnace construction time different from the table?
The table shows base construction time. Your displayed timer can be shorter because of construction research, Chief Orders, state bonuses, heroes, pets, alliance help, and other account modifiers.
How many resources are required for Furnace level 30?
The Furnace level 30 upgrade requires 300 million meat, 300 million wood, 60 million coal, and 15 million iron. You must also have Embassy level 29 and Marksman Camp level 29.
What does Furnace level 30 unlock?
Furnace level 30 prepares your city for Fire Crystal building upgrades. However, the Fire Crystal system must also be available based on your state’s progression.
How many Fire Crystals are needed to reach FC1?
Upgrading the Furnace from level 30 to FC1 requires five sub-upgrades at 132 Fire Crystals each, for a listed total of 660 Fire Crystals.
You also need 335 million meat, 335 million wood, 65 million coal, and 16.5 million iron across those five Furnace stages.
Should F2P players rush the Furnace?
F2P players should prioritize steady Furnace progression without neglecting prerequisites, construction research, resource production, and troop development.
Rushing is useful when it unlocks an important system, but finishing the Furnace early has limited value if the next Embassy or troop camp requirement is still far behind.
Conclusion
The Whiteout Survival Furnace upgrade requirements include much more than the resources shown on the Furnace screen. Prerequisite buildings, construction timers, and state-based progression gates all affect how quickly you can advance.
The most effective strategy is to plan one level ahead. Keep the Embassy close to your Furnace, follow the repeating troop camp and Research Center cycle, and gather enough resources for both the Furnace and its prerequisite buildings.
Before beginning the level 30 and Fire Crystal stages, prepare for substantially higher resource costs and longer timers. Check your current construction bonuses and state progression before committing valuable resources or speedups.
For more building priorities, resource planning, and progression advice, explore our collection of Whiteout Survival guides.
