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Do I Need To Reconnect Drain Pipe on New Water Heater?

I am installing a new water heater. The old water heater has a pipe extending from the drainage pipe. Does this pipe need to be connected to the new water heater?

Normally, a pipe attached to the water heater drain pipe is a recirculation line. While not absolutely necessary, a recirculation line keeps water in the pipe hot and reduces the amount of water wasted before you get hot water. The pipe could also be for a pressure relief line. If it goes to a floor drain, then it is a pressure relief line.


Water Heaters