Your water heater is an important appliance for your home comfort. Unfortunately, it doesn’t last forever. Therefore, it is important to know the efficiency factor and the installation date to anticipate potential problems, find out availability of replacement parts or determine if it’s time to replace the unit completely. Most water heaters have a sticker (manufacturer’s label) on them that displays the efficiency factor and the installation date. Understanding the codes is not always easy. Here are a few tips in reading and understanding the codes. This information will help you make smart home improvement decisions.