Yes...even though many of us likely realize that heat generation is going to come in handy in really cold locations; however, it seems that your preheating idea has to be worth something, even if such preheating is not bringing the temperature to an actual boil (that generates steam with some the current powerful electricity generation methods)...  and I suppose that part of my point is that if there is ongoing research into such lower heat thresholds, there could be ways to generate energy with temperature thresholds that are below boiling   

- I feel like I am devolving from BTC price speculation down to random brainstorming regarding energy generation speculation with little to no grounding.