
Ratio
#11 of 16 coffee machines tested
What the product listing won't tell you
Know before you buy
The Ratio Six is genuinely well-built -- glass water lines, a stainless steel shower head, SCA certification, and a 5-year warranty are real strengths. But for a $359 coffee maker, the disclosure gaps matter: Ratio doesn't publish its brew temperature on the product page, its chemical safety claim stops at BPA-free (not BPS/BPF/phthalate-free), and NSF 372 lead-free certification isn't confirmed. We evaluate what manufacturers disclose, and two of the most safety-relevant fields came back empty.
Ratio
Ratio Six Coffee Maker (Series 2)
Ratio
Ratio Six Coffee Maker (Series 2)
$359.00
We may earn a commission. It doesn't affect our scores.
You want SCA-certified brewing quality with premium build materials (glass water lines, stainless steel shower head) and a 5-year warranty.
You're comfortable with BPA-free assurance and don't require BPS/BPF or phthalate-free verification.
You trust UL electrical safety listing and SCA brewing certification as sufficient quality signals without needing every spec disclosed.
You need the brew temperature published on the product page -- Ratio doesn't list it, which is unusual for an SCA-certified machine at this price.
Full chemical safety transparency (BPS-free, BPF-free, phthalate-free) is non-negotiable for your family.
You want NSF/ANSI 372 lead-free certification confirmed before buying any coffee maker that touches drinking water.
Specs the product listing doesn't explain
What your food and family come into contact with every use
What determines how well this performs its core job
Ease of use, maintenance, and longevity
See exactly what's in this coffee machine
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3 criteria - open any layer to see exactly what we found
“Is the water path safe, and have the chemical claims been independently verified?”
The scoring rationale is locked
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Criteria
Verified retailer - current pricing
Starting price
$359
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Already have an account? Sign inThe Ratio Six Coffee Maker (Series 2) was graded against the same coffee machine-specific rubric we apply to every product in this category — no brand-by-brand exceptions, no sponsored placements, no affiliate-weighted scores. The verdict above came from three pillars: safety (materials, certifications, recall history, chemical exposure pathways), efficacy (independent testing data, verified performance specs, real-world usage durability), and usability (ergonomics, cleaning, noise, parts availability over time). Every point deduction has a citation behind it. Every claim links back to a primary source. Nothing is hidden behind opaque badges.
What separates this from a typical coffee machine review elsewhere on the web: we don't accept sponsorships, paid placements, or rev-share-weighted rankings. The brand of the Ratio Six Coffee Maker (Series 2) cannot pay to move up the list. The score is logic-driven (a weighted formula across safety, efficacy, and usability), not opinion-driven, so an editor's personal preference cannot override the evidence. When two products in this category are within a point of each other, the right tie-breaker is whichever pillar matters most to your household — not whichever one ranks first.
A high safety score on the Ratio Six Coffee Maker (Series 2) doesn't automatically mean “buy this.” A coffee machine that's genuinely safe but loses points on efficacy may still be the wrong fit if performance is what you actually need. Conversely, a coffee machine that's usability-strong but safety-flagged probably isn't the right call for a child with a known sensitivity. The score is the start of the decision, not the end.
R3 is not a medical, legal, or financial advisor. This review is general consumer-safety reporting, not personalized health guidance. If a safety concern on this page intersects with a specific allergy, sensitivity, or medical condition in your household, talk to your pediatrician or a board-certified specialist — they can weigh the evidence against your family's situation in a way no review can. We'll update this page when credible new evidence changes the picture (a recall, a new lab certification, a meaningful product redesign); the last-updated date in the byline is the source of truth on how current this analysis is.
#11 of 16 coffee machines reviewed
Did the Ratio Six Coffee Maker (Series 2) pass our safety screen?
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“Does this coffee maker actually brew great coffee?”
The scoring rationale is locked
Free account unlocks exactly why this product scored the way it did.
“Is this coffee maker easy to use and maintain day to day?”
The scoring rationale is locked
Free account unlocks exactly why this product scored the way it did.