I'm not entirely sure I understand what specifically our friend is asking. He seems to be under the impression that wings and cowls A/I is always on and that the air for that comes from the same source as the ECS air. He also seems to think that there is a bulk fuel heating system present. I can't speak for the 787, but on the airplane I fly, none of the above is the case. The fuel is heated by the FOHEs near the engines, not in the tanks. I gather from his post that he's thinking that the ACMs do a lot more than they actually do.