Best Granitestone Air Fryer: The 16 Qt Glass Model Reviewed

It is worth buying if you cook for a crowd and want to watch food brown through clear glass. It is easy to clean and quiet, and it needs no preheat. It is not worth buying if you cook single servings, want a compact machine, or worry about long-term reliability.

We score air fryers on five things: real capacity, how easy the parts are to clean, how predictably food cooks, how loud the fan runs, and how well the build seems likely to last. We look hardest at the parts that fail first, which on this model means the lid handle, the safety switch and the heater.

This is a rating of the model's features, specifications and known behavior, not a timed cook-off, so we make no claim about a set test period or a particular menu.

We hold Granitestone to what the maker claims, and we label those claims as claims.

Cleanup and the Glass Bowl

Cleanup is the strong point. The glass bowl, basket and racks wipe or wash clean easily, and the maker says all of them are dishwasher safe. The self-clean cycle handles light residue.

The catch is the top unit, which holds the heater head and lid. It cannot go in water, so it takes wiping by hand. Glass also chips or cracks from impact more readily than a metal basket, so we handle the bowl with care.

Cooking Times and Rack Layout

Cook times run long. Chicken and fries often need roughly double the printed cookbook time to get crisp, so treat the booklet as a starting point and check early. Food dries out, especially chicken, when the time is misjudged.

With stackable stainless racks loaded on more than one level, the top rack browns faster than the bottom. Swap the racks partway through or stagger the food. Reheated leftover pizza comes out properly crisp, and a whole chicken cooks without trouble.

Durability and Reliability Concerns

This is where we are gently skeptical. The lid handle presses a small safety switch that lets the unit heat, and that switch and handle assembly is a known failure point. Durability is uneven: some units quit within weeks to a couple of months, and one heater died at about ten months, while others run fine.

The 1-year warranty matters here, and it is the reason we suggest buying from a retailer with an easy return path. Replacement parts are available per the maker.

The same findings apply to all three versions of this model: White 9064, Black 9065 and Silver 8605. The cooking hardware is the same in each, so pick by kitchen style.

White shows splatter most on the exterior, and Black hides it best. Prices shift by color and retailer, so compare before you buy.

Comparison Table

Since there is no second Granitestone to compare, the useful comparison is with another brand. The Ninja Crispi 4-in-1 is a SharkNinja product, not a Granitestone model. We include it only because it is the closest glass-container alternative.

When to Choose a Different Brand

Skip Granitestone in three cases. If you have a small kitchen or cook single servings, the 16 Qt footprint is too big, and a compact portable unit like the Ninja Crispi suits you better. If durability worries you, the uneven record above is a fair reason to look elsewhere. If you want a metal basket that survives drops, glass is the wrong material.

Other brands we cover include the best Ninja air fryer ovens and the best Dash air fryer.

What Makes Granitestone Different (Glass Bowl, Halogen, Infrared and Convection)

Most air fryers use a metal basket and convection only. Granitestone pairs a clear glass bowl with triple heating: halogen, convection and infrared. It offers 6-in-1 functions (air fry, bake, roast, grill, dehydrate and toast), food-icon presets and a range of roughly 180F to 400F. There is no preheat step.

Capacity and Size

The advertised 16-quart capacity is large enough to cook for 5-6 people in one batch. The maker sells it with an extension ring, and the full capacity depends on that metal ring. Some boxes arrive without it, so check the contents when you unpack.

The unit is heavy and bulky, with a large countertop footprint. It suits batch cooking, not single servings, and there is no lid holder, so the hot glass lid rests on the counter while you open the unit.

Coating and Non-Toxic Claims

Granitestone says its glass and stainless steel cooking surfaces are free of Teflon, PFOA and PFAS. That is a manufacturer claim, and we report it as one. For background on why people ask, see the FDA overview of PFAS in food packaging and cookware coatings.

Common Buyer Mistakes to Avoid

• Trusting the cookbook times. Check food early and expect longer cooks.
• Stacking the racks and never swapping them, which leaves the top layer overdone.
• Buying it for one or two servings when a smaller fryer fits better.
• Skipping the box check for the extension ring.
• Putting the top unit in water or the dishwasher.

If the Quick Verdict above sounds right for your kitchen, take a few precautions when buying. Order from a retailer with an easy return path, check the box for the extension ring the day it arrives, and test the lid handle and safety switch early while a return is still simple.