Do Yourself A Favor.... Use A Real Incubator Thermostat Control Unit Of Some Sort.... Yes In A Rare Case Folks Get The Water Heater Themostats To Work For Them, But Most Dont Or They Fluctuate Way Too Much... Its Not Worth The Hastle Imo.... Just Cut To The Chase, Pony Up The Extra Few Dollars And Buy A New Replacement Contol Unit From Gqf Directly Or Ebay Or Whoever