The ones under the black reset cover are what I'm talking about.
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OK, reread the manual. That part is two function. The thermostat controls normal operation at either 130F or 140F. The ECO shuts it down if the thermostat fails and the water reaches 180F. Methinks, however, that if you ever have to press the reset, you need to change the part out, since the thermostat didn't work.