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The Furnace Heater is a block from Factorization that let Slag Furnaces cook without coal. Instead, they use electrical charge from a Solar Turbine or Battery Block. A furnace heater can be connected to Factorization power using a Lead Wire or by simply placing it next to a powered machine.
Furnace heaters will also power vanilla Furnaces. Adding multiple furnace heaters to a single furnace or slag furnace will considerably boost its smelting speed.
They are also used with the Crystallizer.