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Heaters are a researchable building modifier that raise the heat level of non-residential buildings by 1 by consuming 1 coal every hour. Once researched, most non-residential buildings can have heaters toggled on or off as needed. Heaters can be further upgraded up to two times, with each tier increasing the heat level and coal consumption by 1.
Heaters are particularly valuable early game for Medical Tents and Cookhouses and are very useful for production facilities located on the periphery of the generator's heatzones. Do note that the heat provided by the Heaters stacks with the heatzones provided by the generator and steamhubs, so vigilance is advised to avoid draining your coal reserves unnecessarily.
- Heaters were known as "Boilers" in the Frostpunk demo.