“I'm looking for a solid stove design that can boil 1l of water”

When I’m cooking for 2 I do this all the time. The White Box stove with a 1.3L evernew Ti pot works great. With 40F water, ~1.5 mass oz of alcy, it takes about 9-11 minutes to boil depending on other conditions.

These are easier to light with a match, rather than a Bic.

Good luck,
-Barry