Unplugged each device except the return pump. It didn't change much at all so I went out and bought a cheapo $3 thermometer and found the problem. The cheapo thermometer showed 76 degrees while the $38 digital one was showing 79.6. So I went and exchanged the digital for a new one... only to come home and find the replacement having the same variance. Retarded.
Nonetheless, thanks to all for the suggestions.
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