OKay I have always been on the defensive side when people put down the water heater thermostats, IN MY OPINION, the water heater thermostat is good for incubators the size of a cooler, or smaller, BUT I have decided that the wafer thermostats should be used for the fridge and cabinet incubators, I HOPE that this hatch of quail eggs does go well, but after I am done with this batch of eggs in my fridge incubator, I am switching to a wafer thermostat, for the Fridge-bator. But like I said I think it is a waste of money to buy a 25 dollar wafer thermostat for a cooler incubator, but with the cabinet incubators it is necessary.
Good Luck.