ReasonablyBadass t1_j99eja2 wrote

Efficiency has nothing to do with how much energy you need. It's about the ration between resource use and end product.

If other processes need less heat but produce a lot of unusable waste, they are less efficient.

Edit: also,flashing, afaik, means for only a very short amount of time. Might not be all that mich energy overall, actually