Best Plastic-Free Soda & Seltzer Makers
Home carbonation machines for sparkling water and seltzer - and finally, ones that carbonate into glass instead of plastic.
Why plastic matters here
A seltzer habit is a daily-consumption habit, and the standard soda maker design puts plastic at every step: CO2 is blasted under pressure through a PET "carbonating bottle," and the finished seltzer - mildly acidic from the carbonic acid - then sits in that same bottle in your fridge for days. Glass was ruled out for years because bare glass can't safely take carbonation pressure. That changed: machines with enclosed safety chambers (Aarke Carbonator Pro, Mysoda Glassy, SodaStream's Duo line) now carbonate directly into glass, cutting the water's plastic contact from days of storage to, at worst, seconds at the nozzle.
There is also a reason to make your own that has nothing to do with the machine: what you are replacing. Store-bought sparkling water is a known PFAS source - Consumer Reports found Topo Chico with the highest PFAS levels of the brands it tested - so carbonating filtered water at home lets you control what is in it (this is where a home water filter and a soda maker reinforce each other). And the "plastic-free" packaging people assume they are escaping to often isn't: aluminum cans are lined on the inside with a plastic (epoxy) coating, so canned seltzer is not the plastic-free win it looks like.
What to look for
- Glass compatibility is machine-specific - glass needs an enclosed chamber or door for pressure safety, so you cannot just put a glass bottle in a PET-bottle machine
- Check the nozzle, not just the bottle - the wand that dips into the water during carbonation is plastic on most machines (Aarke's Pro and Carbonator 3 both use all-steel nozzles, but that alone doesn't make the water path plastic-free if the bottle is PET)
- Storage dwell time is most of the exposure - carbonating into glass or steel and storing there beats any amount of "BPA-free" bottle marketing
- A steel machine body means nothing for the water path on its own - Aarke's Carbonator 3 ships with a PET bottle, though its own stainless "To-Go" bottle (sold separately) carbonates directly and closes that gap
- All of these use standard screw-in 60L CO2 cylinders (the cylinders themselves are steel - not a plastic concern)
- Glass is not automatically "clean" - the metal cap on a glass bottle usually has a plastic (polyester/plastisol) liner that can shed microplastics, so glass reduces plastic contact rather than eliminating it entirely
Recommended
Every product here we'd actually suggest — best-in-class picks first, then the rest by how plastic-free they are.
Carbonator Pro
The glass-bottle carbonator with the best water path - glass bottle, steel nozzle, silicone seals; the machine's enclosed steel chamber is what makes glass safe under pressure.
E-Duo
SodaStream's glass-carafe machine - carbonates into a dishwasher-safe 1L glass carafe, though the carbonation nozzle and carafe collar are still plastic.
Glassy
Finnish glass-bottle carbonator with an automated sliding safety door and a wood-composite body; nozzle and cap materials are unverified, so assume some plastic in the path.
Carbonator 3
Aarke's mainstream carbonator ships with a PET bottle, but a dedicated stainless-steel "To-Go" bottle attaches and carbonates directly in its place - steel bottle, steel nozzle, silicone-only water path for well under half the Pro's price.
Avoid
Popular options that look plastic-free but aren't — and whole categories worth skipping.
Breville InFizz Fusion
Beautiful stainless machine and the best "carbonate anything" party trick, but the drink still lives in a plastic bottle - the steel is on the outside, not the water path.
SodaStream Terra
The mainstream soda maker, but you carbonate into and store your seltzer in an all-plastic bottle - the exact thing the glass machines exist to avoid.
Drinkmate OmniFizz
Loved for carbonating things other than water (juice, wine), but the carbonation vessels are plastic and there is no glass option. If carbonating non-water drinks matters more to you than the material, it's the niche it owns.
Related:Water Bottles· Water Filters