Age of Pump Failure
No one upon purchasing a sump pump will be able to guarantee how long it will last. Some may fail within the first three years and other lasting as much as twenty years, but an average life would typically be 10 to 15 years. Main reasons for such a wide variance is due to the amount of time the pump has been active in its life.
Keeping track of the age helps, and writing the installation date on something near the pump will help track the age of the sump pump. When the sump pump approaches the average life expectancy of 10 to 15 years, you may want to replace it.
Servicing the pump every few years will extend the life of the pump. Parts such as the o-rings and switch wear out, and in a typical automatic pump, four to seven years is the average switch life.
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