I’m not at all sure, you’re almost certainly right. (Not knowing much about the chemistry, I’m naively conflating the two) Edit to add: Sunamp has non-zero he

I’m not at all sure, you’re almost certainly right. (Not knowing much about the chemistry, I’m naively conflating the two) Edit to add: Sunamp has non-zero heat loss, so it must be stored hot rather than room temperature, but it might not be very hot.