This information pertains to the ARRI Smartpacks originally manufactured in Europe.
The amount of heat generated by a phase control dimmer is determined in part by the load applied.
Maximums based on the full rated load of a Smartpack :
All the dissipation is due to current and is not voltage related, so the values are the same at either voltage.
Combined for a 4 pack touring rack, Maximum total would be 2880W total or 9888 BTUs.