How much power does the Induction heater take to work anyway? I've got two basic steam dynamos (max 80 rf/t) running into one and it only gets a Standard Melting Crucible up to 532K. Compared to a Burner Heater with a single Block of Coal hitting 1950+K, that seems a bit ridiculous since that same block of coal makes about 240,000 RF in a steam dynamo and RF should be more efficient than solid fuel even in its basic production form.

heat provided should be equal to usedEnergy * 2000 / 3

The purpose is to encourage player to use more approaches to heat rather than energy. I will make is coefficient configurable in the future

I can see how you would want to encourage that. What if the induction heater could have an addon block? I know a lot of electric based heating for smelting still requires some form of pre-heater. You could have the pre-heater required to get the heat up but as long as the induction heater had a certain amount of power flow that heat level could be maintained for a much longer time than solid/liquid fuel alone.

This would overall reduce fuel and energy requirements while also adding an interesting mechanic.