I think part of my confusion was that there was no load. The fan was on before I turned the tank heaters on and nothing else was turned on. The fan was off when I went back out last night. Good to learn new stuff.
A question for clarification: do the tank heaters just have an on/off or do they have a thermostat where they only apply heat when the temperature gets cold enough? I know I have to switch them on. I am talking about actually heating.
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