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it makes sure the heater is shut down BEFORE the pump does. It is very important if the heater runs without the pump running the water will boil in the lines and burn out the heater. I know this because my electrician didnt wire mine correctly and that's what happened to me. BYE BYE 2,500 heater

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Q: What is a firefighter's switch on a teledyne laars pool heater?
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