08-21-2009, 10:07 PM
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MoneyMitch...if you have two, most likely one won't ever turn on. The thermostats work by a threshold...if the temperature goes below the lower threshold/temperature, then the heater element is turned on. When the temperature goes above the threshold, the element turns off. So, the heater with the lowest threshold should wins and turns on before the other gets a chance. Although, you could get lucky and have very close thresholds...then they would both turn on for half the time. If they use an electronic temperature sensor, this is a lot more likely compared to a mechanical, expanding metal, type.