If you're like most people in the developed world, you start the morning with a hot shower. Think of all the thermal energy that we spend so much energy to produce, just to let it wash away down the drain and warm our sewers. An innovative way of arranging the physical structure of the plumbing will allow the shower to capture the thermal energy of the hot grey water in a process known as counter-flow heat exchange. Essentially this will take less new hot water to create the same effect as the old shower by incorporating the heat from the drain water into the cold water supply of the shower.
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