Why let it get up to 82?
i think i get why you're asking. I can set it to 80 and accomplished the same thing.
The reason is i want to get notation only if the heater fail ON. Maybe this is not the best method, but my thought is the tank should not exceed 82F without heater failure. In this case, i want all alarm and notification to send out. If i set the High temp to 80, in summer time, the tank will likely get to 80 and is not because of the heater.