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Insulate Your Pipes

This one will only net you small gains when it comes to saving money, but it's still worth doing if you care about hot water. You can buy pipe sleeves at most hardware stores and then use them to cover any water pipes you have in your home. Doing so will ensure that your pipes retain as much heat as possible when there is hot water moving through them.

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It'll save you a little bit of money, but more so than that, it'll help make sure that the warm water keeps flowing for as long as possible before running out.