Is it supposed to be heatpump?
LGs new Signature combo is heatpump technology, was the Whirlpool one supposed to be heatpump as well?
Don't get why manufacturers don't realize the potential of a heatpump washer dryer combo.
A full size heatpump unit for a dryer over here pulls less then 1kW, so you could actually build a 120V combo without compromising on drying time vs a 240V standard combo.
Especially in a full-size unit with a direct drive motor, you should verry easily be abled to fit a full heatpump unit in the bottom of the machine. Maybe you'd have to do a GE RightHeigth kind of design to gain a few inches of space, but that would be a selling point as well.
With an inverter heatpump in use, you should verry much be abled to run heatpump, fan motor and drum motor with 1.2kW of power on a 120V supply. The air paths might not be optimal as they'd have to enter the drum a few inches above the water line, but still, that should be capable of finishing a normal 8 pound load in 3-4h.