This project allows you to leave the reactor running without having to worry that you will have a hole in the ground. In addition, the EU produces 72,000,000 in the process. The other projects did not exceed 50,000,000.
The heat makes a difference only if you are using Quad Fuel.
I know it's inefficient if you all time take care of it, but if you wish leave reactor alone, you need save project.
If you need big effi and need save try this: