Which Air Fryers Have Top and Bottom Heating Elements: UK 2026 Model Guide

If you’re wondering which air fryers have top and bottom heating elements, four UK models to look at are the Cosori Dual Blaze TwinFry 10L, Bosch Series 4 MAF462B1GB, Cosori Dual Blaze Smart 6.4L and Viomi Vortex 7L. These are some of the highest rated Air fryers and each has manufacturer-confirmed heating above and below the cooking basket.

Top and bottom heating is a useful feature if you want food browned from more than one direction. While an ordinary air fryer uses hot air circulating from a top heater, these machines add a lower heat source as well. The extra element is designed to support more even cooking, especially for food such as chips, chicken pieces, potatoes or roasted vegetables.

The 4 models suit different households. The TwinFry has four elements and a large drawer that can be divided into two zones. Bosch combines dual heating with a grilling set. Cosori’s smaller Dual Blaze offers temperature sensors and smart functions, while Viomi brings a viewing window and interior light into the mix.

Which Air Fryers Have Top and Bottom Heating Elements? 4 UK Models Compared

Below is a comparison of the 4 top rated air fryer models. It covers heating arrangements, basket capacity, temperatures, controls and why each one is worth considering.

The choice isn’t about whether any of these four has bottom heating: they all do. The meaningful differences are how much food you can cook, whether you’d use separate cooking zones, which additional programmes are available and how you like to use the controls.

Detailed UK Technical Specifications

Below you can see manufacturer-listed power figures, approximate exterior sizes and further technical features. Measurements are in height × width × depth order. Remember to allow the ventilation clearance and drawer-opening space required by the manufacturer’s manual.

UK Model	Rated Power	Approx. H × W × D	Heating System	Additional Features
Cosori Dual Blaze TwinFry 10L	2,800W	31.3 × 51.8 × 33.8cm	Two upper + two lower	Flexible 10L drawer; two 5L zones
Bosch Series 4 MAF462B1GB	2,050W	33.2 × 27.6 × 38.5cm	Upper and lower	Seven presets; grill set; raised grid
Cosori Dual Blaze Smart 6.4L	1,700W	35.2 × 29.7 × 32.7cm	Upper and lower; dual sensors	Twelve functions; VeSync app
Viomi Vortex 7L	2,000W	37 × 32 × 41cm	1,500W above + 500W below	Twelve presets; window and light

A power rating isn’t a measurement of electricity used during every recipe. The elements are controlled as the machine regulates temperature, and the total energy for a meal also depends on cooking time and portion size.

Cosori Dual Blaze TwinFry 10L: Flexible Zones and Four Heating Elements

The Cosori Dual Blaze TwinFry 10L is particularly appealing if you regularly cook meals that need different amounts of space. Instead of two permanently separate drawers, it has one large basket with a removable partition that creates two 5L zones.

That means you can use the full 10L width for a larger dish or fit the divider when preparing two parts of dinner at the same time. It’s useful when cooking potatoes in one section and chicken or vegetables in the other, then switching to one larger compartment on another day.

Two Heaters Above and Two Below

Cosori specifies four heating elements: two above the cooking area and two beneath it. They work with circulating hot air to bring heat to both sides of the food.

The arrangement makes sense for such a wide basket, particularly when it can function as two zones. Cosori calls it Dual Blaze technology and promotes it as a way of encouraging even browning with less need to manually reposition some foods.

The company also lists two baking racks, giving more ways to arrange suitable ingredients inside the available space. These are useful accessories if you want to experiment with different meals rather than using the air fryer only for chips.

Eight Cooking Functions and High-Temperature Cooking

Cosori lists Air Fry, Roast, Bake, Reheat, Dehydrate and Grill alongside coordinated cooking features for the two zones. These functions cover familiar meals while adding ways to bake, reheat or prepare dried ingredients.

The temperature range is 35–240°C, giving a broad selection of settings. Lower temperatures are useful for gentle drying tasks, while higher temperatures are available for roasting and crisping.

The controls are digital, and Cosori’s VeSync app provides recipes and cooking information. If you enjoy trying new dishes, those extra features can help you get more use from the large basket.

Cleaning, Materials and Who It Suits

The TwinFry has dishwasher-friendly removable parts and a generous drawer. Cosori describes the black finish as having a PFAS-free ceramic cooking surface, while other colour options may use different coatings.

It is the largest model in this comparison, so it’s especially attractive for family-sized portions, batch cooking and varied meals. Measure the intended worktop space, including the clearance required to open the drawer.

You can read the full details on Cosori’s UK TwinFry page. Our article on whether a dual-basket air fryer is worth it is helpful if you’re considering separate cooking zones.

Best for: households wanting upper-and-lower heating plus the flexibility of one large drawer or two independently controlled zones.

Bosch Series 4 MAF462B1GB: Dual Heating With a Practical Grill Set

The Bosch Series 4 MAF462B1GB is a single-basket air fryer, and Bosch explicitly lists its heating system as top heat and bottom heat. That makes it one of the clearest choices when researching this particular feature.

Its 6.1L cooking basket is intended for everyday household portions. Bosch describes room for up to four portions, making it well suited to familiar dinners without needing to divide the cooking space into separate zones.

Heating from Above and Below

The two heaters work alongside rapid hot-air circulation to cook food from several directions. The aim is even cooking and browning in the basket, whether you’re making chips, chicken, fish or vegetables.

Bosch supplies an elevated grid for the basket. Raising food above the bottom helps air move around it and allows cooking juices to collect beneath. It’s a useful part of how the heating system and airflow work together.

For anyone who likes straightforward cooking, the one-basket format means there are no separate zones to configure. Set your temperature or select a programme, and cook the contents of the drawer together.

Seven Presets and More Cooking Options

Bosch advertises seven cooking presets, including common categories such as chips, meat, poultry, fish, vegetables and baked items. The manufacturer’s programme information also includes functions such as defrost and keep warm.

The temperature range is 40–200°C. You can use the touchscreen for everyday settings or adjust it to suit a particular recipe.

An especially welcome addition is the grilling set. Bosch highlights it for foods such as skewers and other grilled dishes, helping broaden the possibilities beyond traditional air frying.

Cleaning and Fit in the Kitchen

Bosch confirms that the removable basket and grid are dishwasher safe. That’s convenient when cooking foods with juices or marinades and gives the appliance a straightforward clean-up routine.

The exterior is approximately 33.2cm high, 27.6cm wide and 38.5cm deep, with any extra clearance determined by the manual. Bosch’s UK technical information also gives a rated power of 2,050W.

The official Bosch Series 4 product page includes the heater arrangement, cooking specifications and accessory details.

Best for: everyday single-basket family cooking with dual heating, preset functions, grilling equipment and easy-wash removable parts.

Cosori Dual Blaze Smart 6.4L: Dual Heaters and Temperature Sensors

The Cosori Dual Blaze Smart 6.4L provides upper-and-lower heat in one generously sized basket. It takes the Dual Blaze cooking idea and puts it into a more traditional single-drawer format than the TwinFry.

For people preparing chips, roast vegetables, chicken portions or other everyday meals, the 6.4L capacity provides a useful amount of space to spread food out and allow air to circulate.

Upper and Lower Heat With Dual Sensors

Cosori describes the P583S series as having an upper element, a lower element and two temperature sensors. The sensors help the appliance monitor and regulate cooking conditions.

The extra lower heat is intended to encourage even browning while the fan circulates hot air throughout the basket. It’s an appealing way to bring two-sided heating to a single cooking compartment.

Cosori promotes its system as helping reduce the amount of turning needed for some foods. Recipes and the supplied instructions should still guide when to shake or turn particular ingredients.

Twelve Functions and VeSync Recipes

The air fryer offers 12 cooking functions, giving plenty of options for different foods and cooking techniques. Its touchscreen allows users to select a function or set the time and temperature manually.

The temperature range is 80–205°C, which covers a wide range of air-frying, roasting, baking and reheating tasks.

VeSync adds recipes and other smart functions. It’s a handy extra for someone who likes discovering new meals while retaining the familiar controls on the appliance itself.

Basket Design and Everyday Cleaning

The 6.4L basket uses a non-stick surface that Cosori promotes for easy clean-up. The listed exterior measurements are approximately 35.2cm high, 29.7cm wide and 32.7cm deep, before allowing for the handle and ventilation space.

Cosori’s official UK range comparison lists this model at 1,700W. You can read more about the dual sensors and cooking features on Cosori’s UK Dual Blaze 6.4L page.

For anyone looking for top-and-bottom heat without separate compartments, it’s an attractive combination of space, temperature sensing and cooking flexibility.

Best for: a generous single-basket air fryer with two-sided heating, sensors, twelve functions and app-supported recipes.

Viomi Vortex 7L: Top and Bottom Heating With a Viewing Window

The Viomi Vortex 7L has a feature that makes everyday cooking particularly engaging: a front viewing window with an interior light. You can watch the food brown without pulling out the basket simply to check its colour.

Its 7L capacity provides space for generous meals, while the single drawer keeps the cooking arrangement straightforward. Viomi markets it for approximately one to four people, depending on the portions.

1,500W Heating Above and 500W Below

Viomi clearly specifies the power of each heater: 1,500W at the top and 500W at the bottom. Combined with circulating hot air, the elements are designed to cook and brown food from more than one direction.

The total rated power is 2,000W. This heating arrangement is a good example of two-sided cooking in an air fryer that doesn’t need a second basket or separate zone controls.

The system works with 360-degree air circulation, so the fan and the two heaters all contribute to the cooking environment.

Twelve Presets, Timer and Light

Viomi provides 12 preset programmes, covering familiar foods and different cooking methods. The touchscreen allows you to work within a temperature range of 80–200°C, with a timer of up to 60 minutes.

The independently controlled interior light makes it easier to see through the window. You can judge how food is browning while keeping the cooking compartment closed.

There’s also a TURN reminder for foods that benefit from repositioning. This is a useful partner to the two-sided heating system, helping you follow the cooking instructions for the selected food.

Dishwasher-Safe Basket and Household Capacity

Viomi describes the non-stick basket as dishwasher safe. That’s a convenient feature when preparing everyday meals with oil or cooking juices.

The approximate exterior measurements are 37cm high, 32cm wide and 41cm deep. Allow room for the drawer to open and the ventilation specified in the manual.

The official Viomi Vortex 7L UK page confirms the heater wattages, temperature range, presets and window. You may also enjoy our guide to air fryers with windows if watching your food cook is important to you.

Best for: a spacious single basket with two-sided heating, a viewing window, a light and useful cooking reminders.

What Does Top and Bottom Heating Mean in an Air Fryer?

A typical air fryer has a fan that circulates hot air rapidly around the food. That airflow helps cook the food and brown its outside, without immersing it in oil.

A top and bottom heating air fryer adds another heating source underneath the cooking area. The fan still circulates air, but the heaters provide warmth from above and below. This helps with heat distribution, particularly when you want the undersides of foods to brown as well as the tops.

Don’t confuse dual heating with dual zone. Dual heating refers to the position of the elements. Dual zone refers to two independently controlled cooking spaces. The TwinFry is an example that combines both, while Bosch, Cosori 6.4L and Viomi use upper and lower heat in single baskets.

Do All Air Fryers Have a Top and Bottom Heating Element?

No. Many conventional air fryers have a main heating element above the food, with a fan circulating hot air around the basket. That design is effective for a wide range of meals.

The models here are notable because their UK manufacturers explicitly confirm heating elements above and below the food. That’s the detail to look for in the specification when comparing air fryers.

A removable crisper plate isn’t the same as a heating element. Its main job is to raise food and allow hot air to reach underneath it. Our guide on what crisper plates do explains the difference.

Are Air Fryers With a Heating Element on the Top and Bottom Better Than Others?

They can be appealing for meals where even browning is a priority. Heat from a lower element supplements the heat above and the fan’s circulating air.

For dishes such as roast potatoes, chicken pieces and baked foods, that’s a useful extra design feature. Manufacturers also create cooking programmes around the way their heating systems work.

The result still depends on airflow, basket shape, ingredients, portion size and cooking settings. Think of dual heating as a genuine benefit rather than a promise that every meal cooks in half the time.

What Are the Benefits of Top and Bottom Heating Elements in an Air Fryer?

If you’re comparing which air fryers have top and bottom heating elements, the main benefits are straightforward:

• Heat from more than one direction: a lower heater brings additional heat to the underside of the food.
• Even browning potential: especially appealing for foods that should brown above and below.
• Cooking convenience: some programmes aim to reduce the amount of manual turning needed.
• Versatility: the heating system works across the functions offered by each model, including roasting and baking.
• Different capacity choices: both single-basket and flexible-zone models can have this technology.

The exact benefits depend on the complete air fryer design. Cosori, Bosch and Viomi each use the same general idea in a slightly different way.

Top and Bottom Heating vs Dual-Zone Cooking

The terms sound similar but mean different things. Dual heating refers to heat sources above and below food; dual zone means two independently controlled cooking areas.

The Bosch, Cosori 6.4L and Viomi have one basket with upper and lower heating. The TwinFry combines two-sided heat with a wide drawer that can be split into two zones.

You don’t need two drawers to enjoy dual heating. Equally, a dual-zone machine doesn’t automatically contain a lower heating element. See our dual-basket buying guide for a closer look at cooking in separate zones.

Are Air Fryers With Dual Heating Elements More Expensive to Run?

Not automatically. Running cost depends on how much electricity the machine actually uses during a complete cooking session.

The rated electrical powers of these four models range from 1,700W for the Cosori 6.4L to 2,800W for the TwinFry. Those are rated inputs, not a guarantee that the heaters run continuously at maximum power for every minute.

Cooking duration, thermostat control, food quantity and the selected programme all affect actual consumption. A larger model may also prepare several portions together, so it’s worth comparing the complete meal rather than wattage in isolation.

The independent UK Energy Saving Trust explains why air fryers can be cheaper to run than a large oven for smaller meals, while larger batches can favour other appliances. For more detail, see our UK air fryer running-cost guide and our air fryer energy-efficiency guide.

What Air Fryer Has Both Top and Bottom Heating, and Which Should You Choose?

All four featured models meet the requirement. Their strengths are different:

• Cosori TwinFry 10L: large meals, a removable divider and the choice between one wide compartment or two zones.
• Bosch Series 4: traditional single-basket cooking with dual heating, presets and a grill set.
• Cosori Dual Blaze Smart 6.4L: dual sensors, twelve functions and VeSync recipes in one basket.
• Viomi Vortex 7L: a roomy basket with a window and interior light for viewing cooking progress.

If you’re not certain about capacity, our UK air fryer size guide explains how litres relate to the foods and portions you’ll cook.

Everyday Tips for Cooking With Two-Sided Heating

Allow room around ingredients for hot air to circulate. Even with a heater below the food, airflow is still an important part of how air frying works.

Follow the model’s instructions on turning and shaking food. Viomi provides a TURN reminder; Cosori’s Dual Blaze technology is designed to encourage browning from both directions. Use the programme and recipe guidance for your particular meal.

Keep removable baskets and crisper plates clean so air can circulate underneath the food. Our guide to the easiest air fryers to clean and article about air fryer liners cover practical cleaning ideas.

Electrical Safety First provides independent UK guidance on using an air fryer safely, including plugs, ventilation, not overfilling and allowing the appliance to cool before cleaning.

Frequently Asked Questions

Does Bottom Heating Mean Food Never Needs Shaking?

Not always. Dual heating helps cook from more directions, but the food and programme still matter. Follow the appliance instructions for shaking or turning.

Does a Four-Element Design Have to Be Better Than Two Elements?

Four elements suit a large and divisible cooking area such as the TwinFry’s. Two heating elements can work very well in a single-basket design. Look at how the whole cooker is arranged rather than the number alone.

Is Top and Bottom Heating the Same as Two Cooking Zones?

No. Three models here have one basket with two-sided heating. The TwinFry combines upper and lower elements with a removable divider to create separate zones.

Can You Roast and Bake With Upper and Lower Heating?

Yes, when the model supports those programmes. Each of the four air fryers has settings beyond standard air frying, giving you several ways to prepare everyday meals.

Do Both Heating Elements Run Continuously?

Not necessarily. Heating systems are regulated to maintain the selected temperature. The rated wattage doesn’t directly tell you the electricity used for each recipe.

Are These Air Fryers Suitable for Families?

They range from 6.1L to 10L in capacity. The right one depends on portion size and whether separate zones would be useful. The TwinFry’s flexible drawer is particularly attractive for preparing different foods together.

Final Verdict: Choosing a Top and Bottom Heating Air Fryer

The Cosori Dual Blaze TwinFry 10L is especially appealing for its four-element heating system and flexible full-width or divided drawer. The Bosch Series 4 offers dual heating in a practical single-basket format with grilling accessories.

The Cosori Dual Blaze Smart 6.4L combines the two heaters with dual sensors and app-supported recipes. The Viomi Vortex 7L adds a window and light so you can see how food is browning.

When shopping for which air fryers have top and bottom heating elements, all four are UK manufacturer-confirmed choices. Pick the cooking space and useful extras that fit the way you make meals.

UK Sources and Further Reading

• Cosori UK — TwinFry 10L: four elements, flexible zones and cooking functions.
• Cosori UK — Dual Blaze Smart 6.4L: upper/lower heating, sensors and app features.
• Cosori UK — Air Fryer Range Comparison: rated power specifications.
• Bosch UK — MAF462B1GB: heating type, wattage, presets and accessories.
• Viomi UK — Vortex 7L: element wattages, window and presets.
• Energy Saving Trust — Air Fryer vs Oven: independent UK energy costs research.
• Electrical Safety First — Air Fryer Safety: independent UK safety guidance.