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    1. The fireman’s switch will turn the heater off 20 minutes before turning off the pump when it is connected to the timer. These were essential with the older millivolt heaters which were not built as heaters are today with the ability to cool down on their own without needing the fireman switch. It was to prevent hot water from sitting in the pipes and melting/distorting the pvc plumbing or causing other hot/scalding issues.

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