Which Kitchen Gadgets Are Worth the Money?
It can be tricky deciding what deserves to take up space in your cabinets. We've done the math, so you don't have to.
Soda Maker
Startup cost: $79 (includes a full carbonator that can make 60 liters of sparkling water, plus 12 liters of soda flavors)

How often you need to use it to make it worthwhile: Every other day for eight months.

If you drink seltzer or other sparkling beverages like it's, uh, water, it makes economic (and eco) sense to purchase a machine. Let's say you finish a bottle of store-bought seltzer every two days (which is about how long it takes before the bubbles get flat): In eight months, you'll have gone through 120 bottles, which would cost about $80 (at 67 cents per liter)—aka the equivalent of your initial investment in a Sodastream. And that's just for plain, sparkling water. If you're making cola or another flavored soda, you'll save even more.