After half an hour on three burners the substrate is up to 166F. Two burners kept it at that temp for an hour.

After half an hour on three burners the substrate is up to 166F. Two burners kept it at that temp for an hour.

After half an hour on three burners the substrate is up to 166F. Two burners kept it at that temp for an hour.

After half an hour on three burners the substrate is up to 166F. Two burners kept it at that temp for an hour.