What if you could recapture and reuse some of that heat energy? The technology's actually existed to do this for some time, but mostly at large scales. There are options for your shower water, but they've traditionally been expensive and fairly inefficient. TheEcoDrain (which one of my PR buds pointed out to me) claims to overcome the hurdles traditionally associated with in-home heat recovery, allowing the homeowner to earn back some of the cost of the unit. Here's the company's video explanation of how the EcoDrain works:
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