How long do the immersion heaters last?

Immersion Heaters are warranted for one year. We recommend taking this heater out at the end of the heating season, cleaning it, and storing it until the next heating season. We know of customers that had multiple heating seasons with this heater by doing this. If left in, this heater can have mineral deposits build up on it. These mineral deposits will create a hot spot and the heater will burn out.