SodaStream Duo
What We Like & Don't Like
✓ Pros
- Glass bottles — unique feature, no plastic needed
- Premium metal body — looks more expensive than Terra
- Quick-connect CO2 — easy cylinder changes
- Dual compatibility — works with glass OR plastic bottles
- Dishwasher-safe carafe — easy cleaning
- Elegant design — carafe looks great on a dinner table
✗ Cons
- Most expensive SodaStream — $80 more than Terra
- Heavy glass bottles — 1kg when full
- Glass is breakable — drop it and it's gone
- Larger footprint — takes more counter space
- Water only — can't carbonate other beverages
In This Review
Glass vs Plastic: Why It Matters
The Duo exists for people who don't want plastic bottles. Maybe you're concerned about microplastics, maybe you dislike the look and feel of plastic, or maybe you want to serve sparkling water in a carafe at dinner parties.
Arguments for Glass
- No plastic touching your water — peace of mind for some users
- More elegant — the glass carafe looks restaurant-quality
- Better taste (subjective) — some people claim water tastes cleaner from glass
- Dishwasher-safe — easier to clean thoroughly
- Longer lifespan — doesn't degrade like plastic (SodaStream recommends replacing plastic bottles every 3 years)
Arguments Against Glass
- Heavy — the glass carafe weighs about 700g empty, 1.7kg full
- Breakable — drop it on tile and you're buying a new one ($30+)
- No fridge storage — the carafe shouldn't be stored under pressure; carbonate, pour, drink
- More expensive — machine costs $80 more than Terra
💡 Important Note on Glass Bottles
SodaStream recommends not storing carbonated water in the glass carafe. Unlike plastic bottles designed to hold pressure, the glass carafe is meant for immediate use: carbonate, serve, done. If you want to make water in advance and refrigerate it, use the included plastic bottle.
Key Specifications
The Bottles: Glass & Plastic
The Duo comes with both bottle types:
Glass Carafe
- 1 liter capacity
- ~700g empty
- Dishwasher-safe
- Metal cap with seal
- Not for fridge storage
Plastic Bottle
- 1 liter capacity
- ~150g empty
- Dishwasher-safe
- BPA-free PET
- OK for fridge storage
How most people use it: Glass carafe for dinner parties and entertaining, plastic bottle for everyday use and making batches to refrigerate.
Carbonation Performance
Carbonation is identical to the Terra — same mechanism, same results. You're not getting better sparkling water from the Duo; you're getting the same sparkling water in different containers.
The glass carafe does hold fizz slightly differently than plastic — some users report the carbonation feels "sharper" from glass, though this might be placebo. Either way, the carbonation quality is excellent.
Design & Build Quality
The Duo has a more premium feel than the Terra. The body is metal rather than plastic, and the overall aesthetic is more refined. It's not as striking as the Aarke, but it's clearly a step up from the entry-level SodaStream models.
The main design consideration is size — the Duo is taller and heavier than the Terra, and it needs more counter space. If your kitchen is cramped, this might matter.
Duo vs Terra
| Feature | SodaStream Duo | SodaStream Terra |
|---|---|---|
| Price | $169.99 | $89.99 |
| Glass Bottles | ✓ Yes | ✗ No |
| Body Material | Metal | Plastic |
| CO2 System | Quick-connect | Quick-connect |
| Carbonation Quality | Excellent | Excellent |
| Size | Larger | Compact |
| Best For | Plastic-free lifestyle | Most people |
The $80 difference buys you: glass bottle capability, metal body, and a slightly more premium look. Whether that's worth it depends entirely on how much the glass feature matters to you.
Who Should Buy the Duo
✓ Buy the Duo if you:
- Want to avoid plastic bottles
- Entertain guests and want elegant presentation
- Like the look and feel of glass
- Are willing to pay for the premium
- Have the counter space
✗ Skip the Duo if you:
Final Verdict
SodaStream Duo
Best for glass bottle users
The SodaStream Duo solves a specific problem: it's the only mainstream soda maker that lets you skip plastic entirely. If that matters to you, it's the obvious choice — there's literally no alternative.
For everyone else, the Terra offers the same carbonation at half the price. The Duo is a good product, but it's a niche one.
Includes glass carafe + plastic bottle
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See also: Best Soda Makers 2026 · SodaStream vs Aarke