Is a self-heating espresso maker heavier?

Five: all four self-heating models (Mino, Nano, Pixapresso and Nano 2) and Staresso's unheated SP200. Three of the light Wacacos take grounds only and the Minipresso NS2 capsules only. The coffee filter treats 'grounds and capsules' as its own group, so choosing 'grounds' alone leaves those five out, and Wacaco's optional capsule adapters aren't counted. OutIn's Nano 2 and Staresso's SP200 give no weight, so a weight limit leaves them unmatched.

It doesn't. The tank figure is how much water goes in, from 70 ml on the Mino to 180 ml on the SP300 Plus among the nine that give one, and none of those numbers is a finished drink size. Most Wacacos hold 80 ml, and every weight here is the device alone, without the water you carry.

Each maker words it differently. Wacaco gives a 180 sec heat-up time for the Pixapresso, OutIn says the Nano heats up in just 200 seconds with a footnote, and OutIn describes the Nano 2 as heating 50 ml of water from 25°C to 93°C per brew. These are the makers' own claims under their own conditions, so they don't line up one to one.