My only point is that, because of the use of insulation and it's low thermal conductivity, you can slow down this process in such a way that it's not economical anymore to turn the heater down at night. (because in the morning it would have to do a lot more effort to reach the same temperature level as it was the day before and thus consuming more energy).
And mine is that, even though good insulation and good system design can reduce the cost of running the heater overnight to arbitrarily small values, the physics of the situation means that the cost if you turn it down is
always fractionally lower still.
Peter
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