Identify & Repair Leaks
Obviously a broken pipe is going to loose a lot of your hot water in a very short amount of time so you will identify and fix these problems quickly. A problem that fewer people identify and solve is leaking faucets. If you hot water tap is leaking, even a small drip, over time you are loosing water a large amount of water that you have paid to heat so its well worth ensuring that your faucets dont leak.
Flush The Tank
Over time magnesium and calcium build up in your water tank. This can can clog up the tank which will eventually lead to the pipes filling up and can even lead to the pipes or the tank bursting due to built up pressure. The best solution is to drain our hot water tank at least once a years and run cold water through the tank to remove the deposits.
Lower Your Thermostat
This may not be an appropriate solution for some one who appreciates a really hot shower but if you dont mind your morning shower being a little cooler turning down your thermostat can save you a lot of money on your heating bill.