God bless my Apex controller, because I probably never would have noticed this potential issue with my heater. Last night my heater stopped working and by this morning the temp was down to 74.1 a 3.6 degree drop. About 6am the heater came back on-line and started heating again. Comparing my temp to the amps I can see that power was on to the system so the problem either lies with my temp sensor or the heater itself. You can see where the temp started dropping last night. The blue spikes show each time my heater kicked on. All this was noticed while at work after checking my tank status. I travel for work quite a bit and I'm glad I have this little peace of mind.