Compare Air Fryers
Granitestone Big Boss 16Qt Large Glass Air Fryer scores higher on safety - here's why.
The most important dimensions, side by side.
The crisper plate base is aluminum. The source does not confirm food-grade certification, so it scores 4/10.
The racks are stainless steel but the specific grade (304, 316, 18/8) is not disclosed. Likely food-safe but unconfirmed.
EverGood ceramic nonstick coating -- PFAS-free per BELLA but any ceramic coating can chip and degrade over time.
Glass bowl and bare stainless steel racks -- nothing to chip, flake, or degrade.
The basket is aluminum without food-grade qualifier. Aluminum can leach into acidic foods at high temperatures.
The glass bowl is tempered glass. Food-safe but less chemically inert than borosilicate glass.
BELLA claims the EverGood coating is made without PFAS, PFOA, PTFE, lead, and cadmium. No independent lab has verified this.
Granitestone claims the product is free of Teflon and forever chemicals. Glass + stainless inherently lack PFAS, but no third-party testing published.
Square basket design provides excellent airflow and crisping performance.
Glass bowl with halogen, convection, and infrared heating provides 360-degree cooking.
At 1300 watts, preheat is slower than higher-wattage models but adequate for the compact 4-quart size.
At 1300 watts, preheating is slower than higher-wattage competitors.
Temperature is fully adjustable for cooking flexibility.
Temperature adjustability not confirmed in sourced data.
Both the basket and crisping tray are dishwasher safe for easy cleanup.
All removable parts including the glass bowl go in the dishwasher.
2-year limited warranty from SENSIO Inc.
Standard 1-year limited warranty.
At $59.99, one of the most affordable air fryers with ceramic coating.
$129.99 for 16 quarts of zero-coating glass + stainless steel cooking.
Everything you need to make the call - who each one is for, and who should skip it.
Go for it if you...
You want an affordable air fryer under $60 with ceramic nonstick coating and dishwasher-safe parts.
You need a compact 4-quart size that fits in tight kitchen spaces.
You are comfortable with ceramic-coated aluminum as a material choice.
You want a 2-year warranty from an established brand (SENSIO Inc.).
You want a large-capacity (16 qt) glass air fryer with zero coatings at a mid-range price.
Dishwasher-safe parts (including the glass bowl) matter for easy cleanup.
You want the glass bowl convection cooking experience with halogen + infrared.
The main thing to know
Both the basket and crisper plate are bare aluminum without food-grade certification. The EverGood ceramic coating is a degradation pathway -- it can chip and flake under abrasion. The PFAS-free claim is manufacturer-only with no third-party lab verification. Material safety drives the overall score down despite strong value and usability.
The Granitestone Big Boss uses tempered glass and stainless steel racks with zero coatings -- strong material safety. The stainless steel grade is unconfirmed (generic, not 304). ETL certification is referenced in Amazon text but not independently verified.
Skip this if you...
You want uncoated food-contact surfaces -- look at glass or bare stainless steel air fryers instead.
You require third-party PFAS-free verification, not just a manufacturer claim.
You prioritize material purity above all else -- bare aluminum without food-grade certification raises safety concerns.
You need a larger capacity for family-sized meals.
You need confirmed 304 or 316 stainless steel on food-contact surfaces.
You want independent PFAS verification beyond manufacturer claims.
You need independently confirmed UL/ETL certification.
Neither of these quite what you're looking for?
I've reviewed all Air Fryers options at every price pointEvery Air Fryers in our database is scored using R3's deterministic scoring system - the same inputs always produce the same score. For this comparison, we evaluated Bella and Granitestone across 3 independent criteria: Safety (90%), Efficacy (7%), Usability (3%). No sponsored rankings. No paid placements.
Straight answers - no sponsored content, no filler.
The Bella 4Qt Slim Air Fryer uses a bare-aluminum basket with a bare-aluminum crisper plate. PTFE-coated nonstick may contain trace PFAS compounds, which is reflected in its 4.3/10 safety score in our scoring system. For a PFAS-free alternative, look for models with stainless steel or borosilicate glass baskets.
Between these two, the Granitestone Big Boss 16Qt Large Glass Air Fryer (borosilicate glass basket, 7.7/10 safety) uses materials I'm more comfortable with at high heat. The Bella 4Qt Slim Air Fryer's bare-aluminum basket scored 4.3/10. In our scoring system, basket material accounts for a significant portion of the safety pillar, which is our highest-weighted scoring factor.
For families, capacity comes first: Bella offers 4-qt vs Granitestone's 16-qt. Overall, I'd lean toward Granitestone for most families.
304 stainless steel is inherently PFAS-free and won't off-gas at any cooking temperature. Nonstick coatings (PTFE/Teflon) are stable below 400°F but can begin degrading above that threshold. In our scoring system, stainless and borosilicate glass baskets consistently score higher on the safety pillar. That said, a well-maintained nonstick basket from a reputable brand still meets safety baselines - it's a question of margin, not danger.
R3 uses a deterministic scoring system - the same inputs always produce the same score. We evaluate each Air Fryers across Safety, Efficacy, Usability using independently verified data. No sponsored rankings. No paid placements. Every score is fully reproducible.
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