I also have a megapot and love it.
I’ve been using a 120v 1800W induction burner for years, but will be looking to upgrade soon. It’s JUST powerful enough to boil 7 gallons or so, but it takes a long time to get there. If your setup allows for an electric brew, I think a 220v induction burner would be the bees knees personally. Extremely efficient, assuming you have electric rates in most of the US. Same might not be true for people in Europe.
That said, most setups (mine included) dont make plugging into a 220v receptacle convenient. For that reason, I’m going to a propane burner soon. Curious to see what others recommend here
I see those types of coffee packets in almost all hotels across the us, so they’re around but I’ve definitely never seen them outside of that.