Small Fusion Reactor

Small Fusion Reactor produces a lot of Power by spending non-heavy fuel (such as Deuterium Rod) and coolant (such as Liquid Nitrogen).

It has 4 slots for fuel. Filling each of them optional (you can choose to fill only 1 slot, or 2 slots, or 3 slots, and the reactor will still work).

Warning: this reactor emits radiation (same type as Fission Reactor).

Coolant
Coolant is needed for safety. You can run the reactor without any coolant, but it will quickly overheat and explode. This doesn't destroy the reactor itself, but the explosion can harm the nearby player or NPC, will deal minor damage to nearby blocks, will cause a major spike of Radiation (same type as from Fission Reactor), and also will stop the reactor for 10 seconds (you can start it earlier by adding a coolant).

The longer the reactor runs, the more heat it will generate. Also, the more power it outputs, the more heat it will generate. Once the heat reaches a high enough level, it will check for coolant if present, consume one unit, and reduce the heat depending on the coolant used. As long as you have coolant in the system, it is almost impossible for the reactor to overheat on its own. If you are outputting over 400 W of power (such as with Purrpetual Energy in each slot) and using a low grade coolant (like Toxic Waste), the heat can build up and the reactor can explode.

These are outputs from 1 fuel slot. If you fill all 4 slots, you will consume 4 times more fuel and produce 4 times more Power.