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Another great idea is to use a heat exchanger on your shower drain.
Basically run your cold water from whereever it comes in your house past your shower. Have the cold waterpipe wrap around your shower drain and then go to the waterheater input.
As you use water from the heater, it needs to pull in cold water to replace the used hot water. The water that it pulls in is already partially heated from the wasted heat you put down your shower drain, so it uses less energy to heat it.
There are commercially available heat exchangers you can buy to do this.
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