Install a bigger water heater Or increase the temperature on the water heater so you use less to get warm water.
Older houses have a tempering tank (which looks like a water heater). It brings water in from the outside and holds it in a tank to bring it to room temperature, and then it goes to the water heater and heats it. Use a rotating pipe cutter (called a close quarter cutter because it can be used in tight spaces) to cut off the cold water tube.
Be sure and have a bucket on hand so that you can catch water that's still left in the pipe. Do the same to the hot water pipe.
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