Oh, another fly in the ointment:
By circulating the coolant every 15 minutes to get a temperature reading, I'm probably distributing the heat differently than the convective currents would on their own.
Meaning, not counting the small amount of additional heat I'm adding from combustion, the final temp by this method will probably be different than if I just plug it in and leave it for the same amount of time.
Still, I'll carry on.
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