They work great, even with brown rice bread.
There's not much waste heat with them.
The point is all electrical functions are becoming more and more efficient, and we have been depending on them for part of our heat. When they are removed from the equation, you really do need something more. E-cat, even as a superefficient battery, would fill the bill. Charge it up during nonproduction hours with no personnel around, and cut it loose to cook during the day.
I would probably choose to increase R-value and decrease infiltration/exfiltration instead.