So first off I live in Minnesota, it gets (stupid) cold, I have been running two Finnex titanium 500w heaters with two EB832 (one in each EB) for my 140 gal system for the past 6 months without issue. I use a temp probe in my sump with one heater is a primary (on at 77.9 off at 78.1) the other is a fallback, (on at 77.5 of at 78.1). I watched a few videos recently (BRS and Neptunes) that mention a titanium heater needs a second fail safe such as a temp controller between the apex and heater, making it more like a conventional heater, which i understand. I previously ran ehiems and the only reason to get away from them is i can't fit 2 250w (4 for redundancy) in my sump, as many of your are aware the ehiems are giants compared to the other options.
Now, after looking at inkbird, JBJ and a few other temp controllers, they all seem to be flawed with a decent amount of issues after reading the reviews. The JBJ temp sensor goes bad and reads off, the inkbird one cannot calibrate. So in my opinion this option would be introducing more error instead of helping. Not to mention they are 40-100 bucks each (80-200 for my pair).
So i wonder what others have done in a similar situation, I was debating on just getting a PM1 and adding an additional temp sensor in the DT, since neptune temp sensors have been very robust for me in the past 5-6 years of using them along with it would be 120 with the probe.
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