Whynter Grande 40 Quart Capacity Counter-Top Multi-Function Intelligent Convection Steam Oven Air Fryer, Oven, Yogurt Maker, Dehydrator & DIY Mode

Meet the Whynter TSO-488GB Grande 40 Quart Countertop Multi-Function Convection Steam Oven — a smart, space-saving appliance designed to replace several countertop machines in one powerful unit. It can steam, air fry, bake, roast, dehydrate, ferment, make yogurt, and customize cooking with DIY Mode.

With its large 40-quart / 1.4 cu. ft. capacity, this countertop oven is built for real everyday cooking. Use it for whole chickens, roasted meats, vegetables, seafood, bread, pizza, casseroles, dried fruit, jerky, and homemade yogurt.

The dynamic convection and steam system circulates heat and moisture evenly throughout the oven, helping food cook faster while staying tender inside and crisp outside. Steam cooking also helps retain natural vitamins and minerals while reducing the need for extra oils and fats.

See It in Action

Key Features

• Extra-large capacity: 40 quart / 1.4 cu. ft. interior for family-size meals
• Multi-function cooking: Ferment, Preheat, Yogurt, Air Fry, Dehydrate, Steam, Roast, Bake, DIY, and Descaling
• Dynamic heating and steaming: Convection fan distributes hot air and steam evenly
• Healthier steam cooking: Helps preserve moisture, vitamins, minerals, and natural flavor
• Dedicated Air Fry mode: Crispy results with less oil
• DIY Mode: Customize cooking settings for your own recipes
• Large water tank: 1.4 liter / 47 oz removable tank for steam cooking
• Wide temperature range: Adjustable from 85°F to 450°F
• Long preset time: Programmable up to 24 hours
• Easy controls: Soft-touch LED control panel and display
• Premium build: Stainless steel housing and easy-clean stainless interior
• Safety features: Display control lock, child lock, interior light, and double-pane glass door
• No PFAS or PTFE

Perfect For

• Family dinners and weekly meal prep
• Air-fried wings, fries, snacks, and frozen foods
• Roasted chicken, turkey, meats, and vegetables
• Steamed fish, seafood, vegetables, and rice dishes
• Fresh bread, pizza, cakes, cookies, and pastries
• Homemade yogurt and fermented dough
• Dried fruits, herbs, vegetables, and jerky
• Small kitchens that need one appliance with multiple functions

Features & Specifications

• Brand: Whynter
• Model: TSO-488GB
• Capacity: Extra-large 40 liter / 1.4 cu. ft.
• Water tank: 1.4 liter / 47 oz
• Functions: Ferment | Preheat | Yogurt | Air Fry | Dehydrate | Steam | Roast | Bake | DIY | Descaling
• Heating modes: Steam | Top Heater | Bottom Heater | Back Heater Convection
• Temperature range: 85°F – 450°F
• Preset time: Up to 24 hours
• Controls: Soft-touch LED control and display
• Safety: Child lock, display control lock, and tempered double-pane mirror glass door
• Materials: Premium stainless steel housing with easy-clean stainless steel interior
• Interior light: Yes
• Power: 120V / 60Hz
• Maximum power consumption: 1800W
• Internal dimensions: 15.32″ W x 13.40″ D x 10.83″ H
• Product dimensions: 20.7″ W x 19.68″ D x 17.32″ H
• Packaging dimensions: 24.25″ W x 22.2″ D x 20.2″ H
• Product weight: 48 lbs
• Shipping weight: 58 lbs
• UPC: 850014459116

What's Included

• Fork Assembly
• Fork Handle
• Broiling / Steaming Rack
• Baking Pan
• Oven Mitt
• Recipe Guide

Download the TSO-488GB User Manual (PDF)

Warranty Information

This unit comes with a one-year limited manufacturer warranty.

Shipping

This item ships directly from the authorized supplier. Tracking information will be provided once the order ships. Please inspect the package upon delivery and contact us immediately if there is any visible shipping damage.

Frequently Asked Questions

Does the Whynter TSO-488GB replace an air fryer?

Yes. The TSO-488GB includes a dedicated Air Fry mode that delivers crispy results with less oil. Its 40-quart capacity also gives you more cooking space than many standard air fryers.

Can this replace a toaster oven?

Yes. It can replace a toaster oven for many users while also adding steam, air fry, dehydrate, yogurt, ferment, bake, roast, and DIY cooking functions.

Can this replace a microwave?

It is not a microwave, but the steam function can reheat many foods gently without drying them out. It is a strong alternative for reheating leftovers, bread, vegetables, and cooked meals.

Does it require a water line?

No. The oven uses a removable 1.4 liter water tank, so no plumbing or water connection is needed.

Should I use distilled water?

Distilled or filtered water is recommended to help reduce mineral buildup inside the steam system.

Can I bake bread in this oven?

Yes. The steam and convection combination is excellent for bread baking because it helps create a crisp crust while keeping the inside soft and moist.

Can I proof bread dough?

Yes. The Ferment mode provides a controlled low-temperature environment for proofing dough.

Can I roast a whole chicken?

Yes. The 40-quart interior is large enough for whole chickens and family-size roasted meals.

Can I cook a turkey in this oven?

Yes. Depending on the size of the turkey, the large 1.4 cu. ft. interior can handle small turkeys and larger poultry dishes.

Can I bake pizza?

Yes. The oven reaches up to 450°F and uses convection heat to bake pizzas evenly with a crisp crust.

Can I make yogurt?

Yes. The Yogurt mode maintains a steady low temperature for preparing homemade yogurt.

Can I dehydrate fruit or jerky?

Yes. The Dehydrate function is designed for drying fruit, herbs, vegetables, and jerky.

Can I cook multiple foods at once?

Yes. The spacious interior and multi-layer cooking design allow you to cook multiple items at once while convection heat helps circulate air evenly.

Is this good for meal prep?

Yes. The large capacity makes it useful for batch cooking proteins, vegetables, casseroles, and other weekly meal prep items.

What is DIY Mode?

DIY Mode allows you to customize cooking settings for recipes that need more control than the preset programs.

How hot does the oven get?

The adjustable temperature range is 85°F to 450°F.

Is the water tank removable?

Yes. The 1.4 liter water tank is removable for easy filling and cleaning.

Is it easy to clean?

Yes. The stainless steel interior can be wiped clean, and the Descaling mode helps maintain the steam system.

Does it have a child lock?

Yes. The Whynter TSO-488GB includes a child safety lock and display control lock.

Will a 9 x 13 pan fit inside?

The internal dimensions are 15.32″ W x 13.40″ D x 10.83″ H. A 9 x 13 pan may fit, but pans with larger handles may be tight from front to back.

Who is this oven best for?

This oven is best for home chefs, families, meal preppers, bread bakers, healthy cooking enthusiasts, and anyone who wants one versatile countertop appliance instead of several separate machines.