Hi,
M120:
Maximum thermal output
AC power: 7,923 BTU/hour (2322 W)
DC power: 8,299 BTU/hour (2432 W)
M320:
Maximum thermal output
AC power: 11,935 BTU/hour (3500 W)
DC power: 10,742 BTU/hour (3150 W)
E320:
3840 W, 13106 BTU/hour maximum
Regards,
Matt