There are a few indicators or factors when deciding if it is time to replace your water heater. Some common indicators are: Calcium buildup can form at the bottom of your tank resulting in a crackling noise when the burners light. Thermostats can act up or fail entirely. A broken dip tube can blend incoming cold water with the outgoing hot water. Unrestrained thermal expansion can cause dangerous pressure levels and ruptured pipes. These in conjunction with other less common troubles can cause a loss of hot water, abnormal hot water, or harm to the plumbing.In conjunction with these factors, age of the water heater should be considered. On average, water heaters last around 10 years although is not unheard of to have a water heater go out after only a few years. If your water heater is over 10 years old and you are experie