Heat is not the same as temperature.
Heat is an energy source and energy can be used to make things work.
But this energy never gets lost. The energy is just being converted into other forms of energy.
For instance you can use heat to make something move and then produce electricity.
Temperature is something you van measure. You need to agree on which method you use to measure the temperature to be able to compare it with other.
This temperature does give you an indication about the amount of heat.