Heating your top off water is a waste of electricity imo.
If you added 1 gallon of ice (-5°C) to 100 gallons of 28°C water
The temperature would only drop the temperature 0.3°C.
Adding room temperature water (21°C) will only drop the temp by 0.069°
I'm pretty sure that a change that small would be perrmissible and that your heater flucuates more than that during its cycling.
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