The Whiteout Survival Infirmary protects wounded troops after battle. Every troop that fits inside can be healed, while troops beyond your available capacity may enter another recovery system or become permanently lost, depending on the battle type.
That makes Infirmary capacity especially important during Sunfire Castle, State of Power, Brothers in Arms, city defense, and other battles that can produce large numbers of severely injured troops.
This guide explains how the Infirmary works, how to increase its capacity, how to heal troops faster, what happens when it becomes full, and how Fire Crystal upgrades affect late-game troop recovery.
Upgrade the Infirmary alongside your Furnace, research Ward Expansion for more capacity, research Bandaging for faster healing, and heal troops in manageable batches during active alliance battles. A level 30 Infirmary has a base capacity of 66,500 troops before research, appointments, and temporary bonuses.
What Is the Infirmary in Whiteout Survival?
The Infirmary is the city building where severely injured troops are sent after eligible battles. Troops inside the Infirmary are not permanently lost. They can return to your army after you complete the healing process.
Healing requires resources and time. The exact cost depends on the number, type, and tier of wounded troops.
Upgrading the Infirmary provides three main benefits:
- Higher wounded troop capacity
- More building power
- Access to Fire Crystal Infirmary progression after level 30
The Infirmary does not increase troop Attack, Defense, Health, or Lethality. Its value comes from reducing the number of troops that may be permanently lost after heavy combat.
How Wounded Troops Work
Not every troop affected by a battle follows the same recovery path. Troops may be classified as lightly injured, severely injured, or lost depending on the battle and whether you were attacking or defending.
- Lightly injured troops normally return automatically after the battle.
- Severely injured troops are sent to the Infirmary when capacity is available.
- Overflow casualties may become reserves in the Enlistment Office during eligible defensive losses.
- Permanent losses cannot be healed through the normal Infirmary.
- Event recovery systems such as Field Triage or revival mechanics may use separate rules.
Important: Do not assume that every troop beyond Infirmary capacity will enter the Enlistment Office. Attacking cities, defending cities, fighting for structures, and participating in State of Power can apply different casualty and revival rules.
Whiteout Survival Infirmary Capacity
Infirmary capacity determines how many severely injured troops the building can hold at one time.
The number shown in your city may be higher than the base values below because Ward Expansion research, Minister of Health, and other temporary bonuses can increase your final capacity.
| Infirmary Level | Furnace Required | Base Upgrade Time | Base Capacity |
|---|---|---|---|
| 1 | 8 | 2 seconds | 200 |
| 2 | 8 | 9 seconds | 300 |
| 3 | 8 | 40 seconds | 400 |
| 4 | 8 | 2m 5s | 500 |
| 5 | 8 | 4m 10s | 600 |
| 6 | 8 | 8m 20s | 700 |
| 7 | 8 | 16m 30s | 900 |
| 8 | 8 | 25 minutes | 1,100 |
| 9 | 9 | 27m 30s | 1,300 |
| 10 | 10 | 50 minutes | 1,600 |
| 11 | 11 | 1h 3m | 1,900 |
| 12 | 12 | 1h 15m 30s | 2,400 |
| 13 | 13 | 1h 32m | 2,900 |
| 14 | 14 | 1h 57m 30s | 3,500 |
| 15 | 15 | 2h 31m | 4,200 |
| 16 | 16 | 4h 16m | 5,000 |
| 17 | 17 | 5h 7m | 6,000 |
| 18 | 18 | 6h 8m 30s | 7,300 |
| 19 | 19 | 9h 13m | 8,800 |
| 20 | 20 | 11h 31m | 10,500 |
| 21 | 21 | 14h 58m 30s | 13,000 |
| 22 | 22 | 22h 28m | 15,500 |
| 23 | 23 | 1d 7h 27m | 18,500 |
| 24 | 24 | 1d 20h 2m | 22,000 |
| 25 | 25 | 2d 13h 39m | 26,500 |
| 26 | 26 | 2d 22h 54m | 32,000 |
| 27 | 27 | 3d 13h 4m | 38,500 |
| 28 | 28 | 4d 1h 50m | 46,200 |
| 29 | 29 | 4d 16h 31m | 55,500 |
| 30 | 30 | 5d 15h 1m | 66,500 |
The displayed upgrade times are base values. Construction Speed research, temporary state bonuses, pets, heroes, and other development effects may reduce the actual time shown in your city.
How to Increase Infirmary Capacity
Upgrading the building is only one way to increase your Whiteout Survival Infirmary capacity.
1. Upgrade the Infirmary
Keep the Infirmary reasonably close to your Furnace level. Capacity rises quickly at higher levels, increasing from 26,500 at level 25 to 66,500 at level 30.
2. Research Ward Expansion
Ward Expansion is found in the Growth section of the Research Center. Each completed level increases Infirmary capacity.
This research is especially valuable for players who participate in frequent PvP because the bonus applies continuously instead of only during a temporary appointment.
3. Apply for Minister of Health
After a state unlocks presidential appointments, eligible players can apply for the Minister of Health position.
- Normal Minister of Health: +100% Healing Speed and +5,000 Infirmary Capacity
- Boosted Supreme President version: +150% Healing Speed and +7,500 Infirmary Capacity
Apply before Sunfire Castle, State of Power battles, or a large healing session. Position availability and appointment queues are controlled by the President and Minister of the Interior.
4. Upgrade the Fire Crystal Infirmary
After level 30, Fire Crystal upgrades continue increasing base capacity. The Infirmary reaches 121,500 base capacity at FC10 before research and temporary bonuses.
How to Heal Troops Faster
Higher capacity saves more troops, but healing speed determines how quickly you can return them to battle.
Research Bandaging
Bandaging is located in the Growth research tree. It reduces troop healing time and should be prioritized by active fighters.
Use Minister of Health
The Minister of Health appointment is one of the strongest temporary healing bonuses. Begin large healing queues while the appointment is active.
Request Alliance Help
After starting a healing queue, request Alliance Help. Each eligible ally who taps the help button reduces the remaining timer.
A stronger Embassy allows more alliance members to help and improves the value of each completed healing batch.
Use Batch Healing
During active alliance battles, heal troops in smaller batches rather than placing every wounded troop into one extremely long queue.
A practical batch-healing cycle is:
- Select a manageable number of wounded troops.
- Start the healing queue.
- Request Alliance Help.
- Wait for active members to complete the help taps.
- Finish or speed up the remaining short timer.
- Repeat with the next batch.
The best batch size depends on how many alliance members are online, your Embassy level, and your available resources.
Battle tip: Smaller batches are most effective when many alliance members are actively tapping help. During quiet periods, larger batches may be more convenient.
What Happens When the Infirmary Is Full?
Once the Infirmary reaches its capacity limit, it cannot accept additional severely injured troops until you heal existing patients or increase the limit.
What happens to the overflow depends on the battle type:
- Eligible defensive losses may create reserves in the Enlistment Office.
- Some attacking losses may become permanently dead troops.
- State of Power may provide additional Field Triage or revival mechanics.
- Event battlefields may return troops automatically or use event-specific recovery rules.
The commonly documented Enlistment Office recovery rule allows approximately 70% of eligible defensive overflow losses to become recoverable reserves. This percentage should not be applied to every type of battle.
How the Enlistment Office Works
The Enlistment Office is a secondary troop recovery system. It does not heal troops in the same way as the Infirmary.
Instead, it holds eligible reserves that can be recruited back into your army by spending Loyalty.
Important Enlistment Office rules include:
- Its capacity is four times your Infirmary capacity.
- Loyalty stops accumulating when it reaches its limit.
- Recovery begins again after you spend Loyalty on reserves.
- Daily mission rewards can provide Loyalty while reserves are present.
- Gathering resources can provide Loyalty while reserves are present.
- Higher Furnace levels can improve the amount obtained.
For example, an Infirmary with 66,500 capacity gives the Enlistment Office a base capacity of approximately 266,000 reserves.
How to Increase Loyalty Recovery Rate
The Loyalty recovery rate is dynamic. The game adjusts it based on the current condition of your Infirmary and Enlistment Office.
You can improve or maintain Loyalty accumulation by:
- Spending stored Loyalty: A lower Loyalty balance allows it to begin accumulating again.
- Healing severely injured troops: Fewer wounded troops remaining in the Infirmary can improve recovery.
- Keeping recoverable reserves: More eligible reserves can affect the accumulation rate.
- Completing daily missions: Claim daily mission rewards while the Enlistment Office contains reserves.
- Gathering resources: Continue gathering while reserve troops are waiting.
- Improving Furnace progression: Higher Furnace levels can increase Loyalty obtained from eligible activities.
Do not leave Loyalty at its maximum. Accumulation stops at the cap, so recruit available reserves regularly when you are rebuilding after a major battle.
Fire Crystal Infirmary Capacity
Once the Infirmary reaches level 30 and Fire Crystal progression is available in your state, it can be upgraded through five sublevels for each complete Fire Crystal tier.
| Infirmary Milestone | Base Capacity | Increase From Previous Tier |
|---|---|---|
| Level 30 | 66,500 | – |
| FC1 | 72,000 | +5,500 |
| FC2 | 77,500 | +5,500 |
| FC3 | 83,000 | +5,500 |
| FC4 | 88,500 | +5,500 |
| FC5 | 94,000 | +5,500 |
| FC6 | 99,500 | +5,500 |
| FC7 | 105,000 | +5,500 |
| FC8 | 110,500 | +5,500 |
| FC9 | 116,000 | +5,500 |
| FC10 | 121,500 | +5,500 |
Each individual sublevel increases base capacity by approximately 1,100 troops.
For the complete sublevel-by-sublevel material table, see the Whiteout Survival Fire Crystal Infirmary guide.
How Much Does the FC6 Infirmary Cost?
Upgrading the Infirmary from FC5 to FC6 requires five construction stages.
The first four stages, FC5-1 through FC5-4, each require:
- 24 million Meat
- 24 million Wood
- 4.8 million Coal
- 1.2 million Iron
- 40 Fire Crystals
- 2 Refined Fire Crystals
The final FC6 stage uses the same normal resources but requires:
- 20 Fire Crystals
- 4 Refined Fire Crystals
The total base material cost from FC5 to FC6 is therefore:
- 120 million Meat
- 120 million Wood
- 24 million Coal
- 6 million Iron
- 180 Fire Crystals
- 12 Refined Fire Crystals
Base construction time is approximately 2 days, 2 hours, and 24 minutes for each stage before construction-speed bonuses.
Does the Infirmary Unlock Fire Crystal Troops?
No. Upgrading the Infirmary to FC3, FC6, FC8, or another Fire Crystal level does not directly unlock stronger troops.
Fire Crystal troop progression comes primarily from:
- Your Furnace level
- Infantry Camp upgrades
- Lancer Camp upgrades
- Marksman Camp upgrades
- War Academy research for advanced troop tiers
The Fire Crystal Infirmary only increases wounded capacity and building power. It supports stronger troops by giving you more recovery space after battle.
Should You Prioritize the Infirmary?
The correct priority depends on how actively you fight.
| Player Type | Infirmary Priority | Reason |
|---|---|---|
| Peaceful or protected player | Medium | Capacity is useful, but core Furnace progression may provide more immediate value. |
| Casual event fighter | Medium to High | Helps absorb wounded troops during occasional PvP events. |
| Rally joiner | High | Repeated rallies can fill the building quickly. |
| Rally leader or city defender | Very High | Large battles can produce more wounded troops than a neglected Infirmary can hold. |
For most active players, the Infirmary should not fall far behind the Furnace. However, it does not normally replace the Furnace, Embassy, troop camps, or essential prerequisite buildings in the main progression path.
Infirmary Management Tips
- Heal before PvP begins: Enter major battles with an empty or nearly empty Infirmary.
- Check capacity before reinforcing: Reinforcing a difficult structure can generate large numbers of wounded troops.
- Use batch healing: Take advantage of active alliance help during Sunfire Castle and State of Power.
- Reserve resources: Healing high-tier troops can consume large amounts of Meat, Wood, Coal, and Iron.
- Research Ward Expansion: Permanent capacity research protects you in every eligible battle.
- Research Bandaging: Faster healing lets you clear space before the next attack.
- Apply for Minister of Health: Time the appointment around large healing queues.
- Monitor the Enlistment Office: Spend Loyalty before it reaches the maximum.
- Read event rules: Field Triage and event revival systems may change normal casualty recovery.
Account comparison note: Players evaluating an established profile can review a wos account for sale. Check the Infirmary level, Ward Expansion research, Fire Crystal progression, troop tiers, healing resources, and current state before comparing accounts by total power.
Common Infirmary Mistakes
Entering Battle With a Partially Full Infirmary
Existing wounded troops occupy capacity that could be needed during the next battle. Heal them before planned PvP whenever possible.
Assuming the Enlistment Office Saves Everything
The Enlistment Office applies to eligible reserve losses and has its own capacity. It does not protect every casualty from every type of attack.
Healing Everything in One Queue
One long queue can make alliance help less efficient during an active battle. Use smaller batches when many members are online.
Ignoring Ward Expansion
Building upgrades alone may not provide enough capacity for a large late-game army. Research provides an important permanent increase.
Running Out of Healing Resources
High-tier troop healing can be expensive. Keep protected resources or resource items available before major battle days.
Using Minister of Health Too Late
Secure the appointment before starting the large healing queue so both the speed and capacity bonuses are active when needed.
Whiteout Survival Infirmary FAQs
What happens when the Infirmary is full?
Additional severely injured troops cannot enter the Infirmary. Eligible defensive losses may become Enlistment Office reserves, while other casualties may be permanently lost or handled by an event-specific revival system.
How do I increase Infirmary capacity?
Upgrade the Infirmary, research Ward Expansion, progress through Fire Crystal levels, and use the Minister of Health appointment when available.
What does Minister of Health do?
The normal appointment provides +100% Healing Speed and +5,000 Infirmary Capacity. The boosted Supreme President version provides +150% Healing Speed and +7,500 capacity.
How do I increase Loyalty recovery rate?
Spend Loyalty before it reaches the cap, heal severely injured troops, complete daily missions, gather resources, maintain recoverable reserves, and improve your Furnace level.
Is batch healing faster?
Batch healing can be much faster when active alliance members repeatedly provide help. Start manageable healing queues, request help, finish the timer, and repeat.
How much does the FC6 Infirmary cost?
From FC5 to FC6, the five stages require a total of 180 Fire Crystals, 12 Refined Fire Crystals, 120 million Meat, 120 million Wood, 24 million Coal, and 6 million Iron.
Does an FC8 Infirmary unlock FC8 troops?
No. Fire Crystal troops are unlocked through Furnace, troop camp, and advanced research progression. The Infirmary only increases wounded capacity.
What is the maximum Infirmary capacity?
The FC10 Infirmary has a base capacity of 121,500 troops. Ward Expansion and temporary appointment bonuses can raise the displayed capacity further.
Conclusion
The Whiteout Survival Infirmary is one of the most important defensive buildings for active fighters. A larger capacity protects more severely injured troops, while faster healing clears space before the next battle begins.
Keep the building near your Furnace level, prioritize Ward Expansion and Bandaging research, and apply for Minister of Health before major healing sessions. During alliance battles, use manageable healing batches so active members can repeatedly reduce your timers.
Most importantly, do not depend entirely on the Enlistment Office. Its capacity and recovery rules are limited, and not every type of casualty is eligible for reserve recovery.
For more city development, troop, hero, and event strategies, explore the Whiteout Survival guides on Heaven Guardian.
