I checked for wattage and they do not post it, but they do post amperage so I used that as a gauge instead. Difficult to know if it's the motor that takes more juice or if it's the heating elements, but it's better than nothing.
The H200 and H300 both share the same amperage, so I'd say save your money and get the H200 unless you absolutely want to laminate something 11" x 17" or so. The H400 has no amperage rating and has 2 extra unheated rollers. The upper range laminators are WAAY more expensive.