G'Day Cobber,
Without going into specific figures, the energy required to hold it above ambient is more if holding at 38C than at 34C, a well as the time to reheat.
But you would have to calculate the usage and idle times as well as the gradient loss of energy when cooling.
Whoa, a lot more involved in giving an answer than you envisage.
Kindest Regards, " The Druid ".
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