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In my case, I use two Eheim heaters and get them calibrated to my preferred temp range 78 - 78.5. Then I make one my primary heater, and second one becomes a fail safe (only used if primary heater fails) both are them monitored by my Apex. I also tend to buy wattage, which is less than recommended as kind of another fail safe. Works great for me.
any tips on calibrating the Eheim heater? I tried but gave up.