Energy from wastewater can cover 70% of the community's heating. Photo: Eos Lightmedia
It's crazy when you think about it. From showering in the morning to draining the pasta for dinner, we each put gallons of hot water down the drain every day.
Mix it all up, and it's enough to keep our sewers flowing at a balmy average of 15C. That's a lot of energy babies being thrown out with our bathwater.
I've always thought there should be a way to re-use that heat, but I suspect the demand for lukewarm sewage-filled radiators is fairly modest. Luckily, there's another way.