Chemex CM-6A Classic 6-Cup vs Ratio Eight Series 2 (glass carafe)
Chemex CM-6A Classic 6-Cup
Ratio Eight Series 2 (glass carafe)
The short answer
Chemex CM-6A Classic 6-Cup comes out ahead overall with 7.4/10 against 7.0/10 for the Ratio Eight Series 2 (glass carafe). Chemex CM-6A Classic 6-Cup is stronger on plastic-free brew path and value. Ratio Eight Series 2 (glass carafe) is stronger on coffee quality, health & materials transparency, ease of use & cleaning and durability & repairability. At current verified prices, the Chemex CM-6A Classic 6-Cup costs about $651.97 less.
- Choose the Chemex CM-6A Classic 6-Cup if: Budget buyers who own a kettle and will brew by hand for a fully plastic-free path. For warranty coverage, buy from chemexcoffeemaker.com or the 'Chemex Coffeemakers' Amazon account.
- Choose the Ratio Eight Series 2 (glass carafe) if: Design-focused buyers who will pay $699 for pour-over-style automatic brewing through glass water lines, and can accept a Tritan cold-water tank.
Scores by criterion
| Criterion | Chemex CM-6A Classic 6-Cup | Ratio Eight Series 2 (glass carafe) |
|---|---|---|
| Plastic-Free Brew Path | 10.0Only borosilicate glass and a paper filter touch the coffee. | 8.5Glass and stainless hot path. Plastic is limited to the Tritan cold tank. |
| Coffee Quality | 6.5Bonded filters make a clean cup, but there's no temperature control and no SCA certification. Results depend on the user's kettle and pour. | 7.0Unverified estimate: pour-over-style design, but no certification or lab test for the Series 2. |
| Health & Materials Transparency | 7.0Simple, disclosed materials (labware-grade borosilicate). | 7.5Names the polymer (Tritan TX2001) and the silicone grade. No PFAS statement. |
| Ease of Use & Cleaning | 4.0Needs a separate kettle and a manual pour, which the rubric penalizes. The neck needs a brush to clean. | 6.0One button. The carafe and dripper aren't dishwasher-safe. |
| Durability & Repairability | 6.0Nothing electronic to fail, but the glass can break, breakage isn't covered, and the Amazon warranty depends on the seller. | 7.55-year warranty and a parts shop, but the hand-blown glass is fragile. |
| Value | 9.0About $47 for a fully plastic-free brew path. | 4.5$699, the most expensive pick. |
Specifications
| Spec | Chemex CM-6A Classic 6-Cup | Ratio Eight Series 2 (glass carafe) |
|---|---|---|
| Brewer Type | Manual pour-over | Automatic drip (pour-over style) |
| Brew Capacity | 30 oz | 40 oz |
| Water Reservoir Material | None (kettle required) | Eastman Tritan TX2001 copolymer (cold water only) |
| Brew Basket / Filter Holder Material | Borosilicate glass cone with paper filter | Double-wall stainless steel |
| Carafe Material | Borosilicate glass | Hand-blown borosilicate glass |
| Plastic-Free Hot Brew Path (as shipped) | Yes | Yes |
| Programmable Timer | No | No |
| Power | — | 1,400 W |
| SCA / ECBC Certified | No | — |
| Warranty | — | 5 years |
Chemex CM-6A Classic 6-Cup
Pros
- Fully plastic-free brew path
- Budget price
- No electricity or electronics
- Same-design 8-cup size available
Cons
- Needs a kettle and some technique
- Glass is breakable
- No temperature control or certification
- Warranty does not cover breakage
The best value here, and the cleanest path of any pick. Chemex says its warranty covers Amazon purchases only from its own Chemex Coffeemakers seller account, so buy from chemexcoffeemaker.com or check the seller name on the Amazon offer.
Full Chemex CM-6A Classic 6-Cup review →Ratio Eight Series 2 (glass carafe)
Pros
- Glass water lines and stainless basket
- Borosilicate glass carafe
- Named polymer disclosed for the tank
- 5-year warranty
Cons
- Premium price
- Tritan cold-water tank and polymer base
- Glass lines are fragile
- Carafe and dripper are not dishwasher-safe
A handsome machine that keeps hot water and coffee off plastic. It costs far more than the SimplyGoodCoffee Brewer, and its tank is plastic, so choose it for the design more than the materials.
Full Ratio Eight Series 2 (glass carafe) review →Both products are part of our guide The Best Plastic-Free / Non-Toxic Drip Coffee Makers of 2026, where you can see every pick, how we score and current prices from each retailer.