The Cirrus 3 has features that makes it a hybrid between a steamer and iron. This steamer has a mouthpiece consisting of an ironing plate that is heated. Cirrus 2 has a mouthpiece made of steel that does not heat up itself. It simply gets hot from the steam but has no additional heat like 3.
The Cirrus 3 can stand up, Cirrus 2 must be held or put down horizontally.
Cirrus 3 has an automatic shut off function and will automatically turn itself off after 30 minutes of inactivity. It also has an on/off switch in addition to the steam button. This means it can always stay plugged in for easier use. Cirrus 2 must be unplugged after use and has no on/off switch.
Cirrus 3 produces a higher amount of steam per minute, but it runs on lower wattage. It is also slightly smaller than Cirrus 2. Apart from this, the steamers have obvious differences in their design and look.