unfortunately that is the number one failure point of most tanks, the thermal coupler kick switch fails inside a heater and it sticks in the on position.
I won't go back from a titanium heater and a tank controller of some sort, just won't; I have way to much time money and love invested in my two tanks to take any unnecessary risks and I do think, it is unnecessary because it's the #1 failure of tanks.
sorry...
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130 Gal Community Planted Tank and a 250Gal Peninsula FOWLR
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