I have been leaving my windows open and my house got down to 67 degrees last night. I noticed the tank heater was on when I left for work this morning. I love this weather!
Z in my daily programming of heat I stage on different but back off the same. The reason for staging is because 1 stage won't keep up.
So if you want to heat up to 78 you might bring the first stage on at 77 and the second stage on at 76.5. Both would run together from 76.5 up to 78 and both shut off together. Only 1 stage would be needed for moderate days.
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