That is probably because your post was a rather irrelevant contribution to an irrelevant thread.Fair enough maybe, but your response, as far as it goes, is not helpful.It's more wrong than right.
What does it matter where the wasted energy goes? What does it matter why the energy is wasted? The only possible point of interest about the whole efficiency story ( at which point does it become financially interesting to replace a low efficiency boiler with a HE model ) has not been mentioned.
It's a bit like asking why exactly it is bad for you to be massively obese, and which disease you are most likely to die of as a result.