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 racks are stainless steel but the specific grade (304, 316, 18/8) is not disclosed. Likely food-safe but unconfirmed.
The crisper plate is aluminized steel -- a carbon steel base with aluminum coating for heat resistance. Not stainless steel.
Glass bowl and bare stainless steel racks -- nothing to chip, flake, or degrade.
PTFE (Teflon) nonstick coating confirmed by Instant Brands chemical disclosure page. PTFE is a PFAS compound.
The glass bowl is tempered glass. Food-safe but less chemically inert than borosilicate glass.
The basket is aluminized steel. Material is disclosed but not food-grade stainless.
Granitestone claims the product is free of Teflon and forever chemicals. Glass + stainless inherently lack PFAS, but no third-party testing published.
Instant Brands' own chemical disclosure page explicitly lists PFAS among chemicals present. This product contains PFAS by design.
Glass bowl with halogen, convection, and infrared heating provides 360-degree cooking.
Square basket provides more cooking surface and better airflow for even crisping.
At 1300 watts, preheating is slower than higher-wattage competitors.
At 1700 watts, this is one of the most powerful air fryers. Fast preheating and strong temperature recovery.
All removable parts including the glass bowl go in the dishwasher.
The basket is dishwasher safe (top rack).
Standard 1-year limited warranty.
Standard 1-year limited warranty.
$129.99 for 16 quarts of zero-coating glass + stainless steel cooking.
$149.99 for a 6-quart, 1700W, ETL-certified air fryer from a major brand.
Everything you need to make the call - who each one is for, and who should skip it.
Go for it if you...
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.
Cooking performance is your top priority -- 1700W with square basket is category-leading.
You value ETL-certified electrical safety in a well-known brand.
PTFE coating and PFAS presence are acceptable tradeoffs for you.
The main thing to know
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.
PTFE coating confirmed on all food-contact surfaces. Instant Brands' own chemical disclosure page explicitly lists PFAS. Basket and crisper plate are aluminized steel (generic steel). ETL-certified for electrical safety.
Skip this if you...
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.
You want PFAS-free food-contact surfaces -- this product explicitly contains PFAS.
You want verified material safety beyond electrical certification.
You prefer glass or stainless steel food-contact surfaces.
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 Granitestone and Instant Pot across 3 independent criteria: Safety (90%), Efficacy (7%), Usability (3%). No sponsored rankings. No paid placements.
Straight answers - no sponsored content, no filler.
The Granitestone Big Boss 16Qt Large Glass Air Fryer uses a borosilicate glass basket with a stainless steel crisper plate. Stainless steel and glass are inherently PFAS-free materials, so this model passes our material safety screen.
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 Instant Vortex Plus 6-Quart Air Fryer's steel basket scored 3.8/10. 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: Granitestone offers 16-qt vs Instant Pot's 6-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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