Electric Heater
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The electric heater is a machine that provides heat energy (TU) to heat-consuming machines such as the crucible. Their energy consumption (and thus heat production) can be adjusted by right clicking with a screwdriver. They can be stacked to produce more heat with an efficiency penalty, and slowly lose heat over time. This behavior also makes them useful as heat sinks for other heat producing machines.
Crafting

Operation
The electric heater needs to be placed below the machine that requires the TU. It also has an internal TU buffer, storing up to 1,000 TU while operational and not being drained of TU.