Mod Version: Newest Update (1.0.27X4389)
Computer OS: MacOS Monterey
Mod List: CodeChickenCore, CodeChickenLib, DeconTable, Journeymap, NEI, Torcherino, VeinMiner, Waila, WailaHarvestability
Possible method of replicating:

1. Put down the electric heater
2. Connect the heater to an energy source (tried all possible location & energy source)
3. Enable the energy source
4. From the data that the block shows, there is no HE input nor any TU output
   Screenshots:
   
   

Use a screwdriver to turn it on.

..I'm sorry