Ah, gotcha.
A bit off topic, the 20->15 cords you offer for the BIT-20 and BIT-20AVR in order to connect them to 15A circuits, what are those cords spec'd at, 15A or 20A, so 14AWG or 12AWG? The reason I'm curious is say a person needs one initially then upgrades the house wiring and receptacles to 20A later but misplaces the true 20A cord that came with the unit. Will it be safe to continue to use the 20->15 cord and will that cord once connected to a 20A system allow for the true 20A performance of the unit even though the AC plug is different i.e. a 15A plug and not a 20A plug?