Pay less for hot water by insulating pipes. That can also help decrease the chance of pipes freezing, which can be disastrous. Check to see if your pipes are warm to the touch. If so, they are good candidates for insulation. (Use the same method to determine if your hot water heater would benefit from some insulation.)
You can get pre-slit pipe foam at most hardware stores. Cut it to size and fasten in place with duct tape. Ideally, choose the insulation with the highest R-value practical, which is a measure of its heat-blocking power. Pipe insulation is often R-3, or, for batt styles that you wrap around, a stronger R-7.
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