Available on Project MUSE and JSTOR. Online access to Contemporary Literature is available as part of the Project MUSE collections. All back issues of Contemporary Literature beginning with Vol. 1, 1960 are available online through the JSTOR digital archive.
Many manufacturers recommend water heater anode replacement every two to four years depending on the hardness of the water that passes through the tank and the quality of the water heater lining.
When to repair and when to replace. A conventional storage tank water heater has a life of about 10-15 years, so if your unit is in that age range, it may be worth footing the cost to replace your water heater than constantly fixing regular problems as they arise with age. However, if your water heater is only a few years old, repair may be the way to go.