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Re:Ask HN: What are the best-designed things you've ever used? by jerkstate on Friday November 26, 2021 @10:12PM (#29357002)
ah, you want this, which also exists: https://www.finehomebuilding.com/2013/03/07/hot-water-circul...

the way I do it is just turn the shower on about 30 seconds before I get in, which works the same with half the piping and less energy loss due to circulating hot water (but some water loss)

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