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| Heater Efficiency Upgrade |
|---|
| |
| Heaters will burn less Coal (-1 coal per Heater). | |
| Tier 3 | |
| Time | |
| Easy | 8 hours |
|---|---|
| Medium | 10 hours |
| Hard | 14 hours |
| Extreme | 16 hours |
| Cost | |
| Prerequisite | Improved Heaters |
 Wood
|
60 |
 Steel
|
40 |
Heater Efficiency Upgrade is one of the Technologies in Frostpunk.