Truma has now announced North American availability and specifications for the Combi gas fired units:
The product naming has been modified, perhaps because the American market is unfamiliar with heat output expressed in KW terms?
Combi 4 (4kw/14kbtu) has been renamed to Combi eco
Combi 6 (6kw/20kbtu) is now the Combi comfort
They also offer 'Plus' versions of both units with 120V electrical heating when hookups are available.
Power consumption on these NA certified units has increased slightly over their Euro equivalents but is still very efficient at 1.6 amps average (12v) for combination heating and 0.9amps when firing for water heating alone. Standby consumption isn't listed but was 0.001 amps for the Euro controller.
Pretty impressive to see a high efficiency water/air heating system in a sealed combustion unit just slightly larger than the water heater alone in my SMB unit.