Proper maintenance is key to keeping your water heater in good condition. If you have a tank water heater, flush it once a year to clear out sediment buildup. You may live in an area with hard water, so check your anode rod and replace it if necessary. Some people also install a water treatment system to treat water for rust and minerals. Having a trusted technician or plumber who can perform maintenance is also a great way to extend the life of your water heater.