What Is the Best Fuel for a Tunnel Oven?

In the food manufacturing industry, baking quality plays a vital role in the success of the final product. Biscuits, crackers, cookies, and many similar products achieve the desired quality only when the baking process is uniform, precise, and fully controllable. For this reason, the tunnel oven is one of the most important pieces of equipment in industrial production lines.

What Is the Best Fuel for a Tunnel Oven؟

Choosing the right fuel is not limited to energy costs alone. Factors such as thermal efficiency, baking quality, maintenance costs, fuel availability, production capacity, and even regional climate conditions also play an important role in this decision.

What Is a Tunnel Oven?

A tunnel oven is an industrial baking machine in which products move continuously on a conveyor belt while the baking process takes place through multiple heating zones along the tunnel. Unlike traditional batch ovens, a tunnel oven operates continuously. As a result, production capacity is significantly higher, and product quality remains consistent throughout the process.

It is used to produce:

• Biscuits
• Crackers
• Wafers
• Cookies
• Industrial Bread
• Cakes
• Snacks
• Dry Pastries

Why Is Fuel Selection Important?

The type of fuel directly affects:

• Production cost per kilogram
• Oven heating speed
• Baking uniformity
• Product color quality
• Energy consumption
• Maintenance costs
• Equipment lifespan
• Emissions

For this reason, selecting the wrong fuel can significantly increase production costs.

Types of Fuel Used in Tunnel Ovens

Three primary fuel types are used in tunnel ovens:

• Natural Gas
• Diesel Fuel
• Electricity

Some manufacturers also produce dual-fuel tunnel ovens that can operate with either natural gas or diesel fuel.

Gas-Fired Tunnel Oven

In Iran, gas-fired tunnel ovens are the most popular choice for biscuit manufacturing plants. In addition to its lower cost, natural gas provides cleaner combustion than diesel fuel and reduces equipment maintenance costs.

Advantages

• Lowest fuel cost
• High thermal efficiency
• Uniform flame
• Precise temperature control
• Lower production costs
• Lower emissions
• Suitable for 24-hour production

Disadvantages

• Requires an industrial gas connection
• Dependent on gas network pressure
• Possible supply restrictions during certain seasons

Diesel-Fired Tunnel Oven

In areas without access to natural gas, diesel fuel is considered the best alternative. These ovens are typically equipped with high-capacity industrial burners that provide strong heating performance.

Advantages

• Can be used in all regions
• Rapid heating
• Suitable for factories far from the gas network

Disadvantages

• Higher fuel cost
• Requires a fuel storage tank
• Requires periodic burner maintenance
• Higher emissions

Electric Tunnel Oven

Some food industries use electric heating elements to generate heat. This type is mainly used for lower production capacities or in countries where industrial electricity costs are relatively low.

Advantages

• No smoke
• No burner
• Very precise temperature control
• Lower maintenance requirements

Disadvantages

• High electricity consumption
• Higher energy costs
• Requires a high-capacity three-phase power supply

Types of Fuel Used in Tunnel Ovens

Comparison of Tunnel Oven Fuel Types

What Is the Best Fuel for Biscuit Production?

If a factory has access to natural gas or an industrial gas supply, a gas-fired tunnel oven is the best choice because of:

• Lower operating costs
• Better baking quality
• Higher efficiency
• Better temperature control
• Faster return on investment

Does Fuel Type Affect Biscuit Quality?

Yes, but not as much as many people think. Product quality depends primarily on:

• Hot air circulation design
• Number of heating zones
• Temperature control system
• Heat transfer uniformity
• Conveyor belt speed

If these factors are properly designed, the difference in baking quality between gas-fired and diesel-fired tunnel ovens will be minimal.

Heating Zone System in a Tunnel Oven

Professional tunnel ovens usually include multiple heating zones.

Zone 1

Initial moisture evaporation

Approximate temperature:

150–180°C

Zone 2

Main baking stage

Approximate temperature:

200–230°C

Zone 3

Color development

Approximate temperature:

180–210°C

Zone 4

Final drying

Approximate temperature:

150–180°C

This zoning system ensures uniform baking throughout the product.

What Factors Affect Tunnel Oven Fuel Consumption?

Many people assume that all tunnel ovens consume the same amount of energy. In reality, energy consumption depends on the following factors:

• Oven length
• Oven width
• Insulation thickness
• Burner quality
• Production capacity
• Ambient temperature
• Conveyor belt speed
• Product type

How Can Fuel Consumption Be Reduced?

The following methods help reduce energy consumption:

• Using energy-efficient burners
• Standard insulation
• Proper flame adjustment
• Regular burner maintenance
• Intelligent temperature control
• Preventing heat loss
• Using heat recovery systems

What Is a Dual-Fuel Tunnel Oven?

Some factories prefer tunnel ovens that can operate with both natural gas and diesel fuel. The advantages of this system include:

• Preventing production downtime
• High operational flexibility
• Suitable for emergency conditions
• Improved production reliability

What Should You Consider When Buying a Tunnel Oven?

Many buyers focus only on the purchase price of the oven, while the following factors are far more important:

• Stainless steel body quality
• Insulation thickness
• Burner brand
• PLC control system
• Number of heating zones
• Temperature uniformity
• Energy consumption
• After-sales service
• Spare parts availability
• Manufacturer experience

About Ettehad Noavaran

Ettehad Noavaran is one of Iran’s specialized manufacturers of industrial food processing equipment, with many years of experience in the design, manufacturing, and commissioning of food production lines. Relying on technical expertise, high-quality components, and modern technologies, the company designs and manufactures a wide range of equipment for biscuit, cookie, cracker, cake, and other food production lines.

Its products include industrial tunnel ovens, dough mixers, forming machines, conveying systems, cooling equipment, and packaging machines, all of which are custom-designed and manufactured according to each factory’s specific production requirements.

The goal of Ettehad Noavaran is to provide industrial solutions with high efficiency, optimized energy consumption, and reliable after-sales service, enabling manufacturers to expand their production lines with confidence.

Why Choose Ettehad Noavaran?

✔ Custom design and manufacturing based on factory production capacity

✔ High-quality industrial materials and components

✔ Optimized energy consumption and high efficiency

✔ Installation and commissioning by a specialized team

✔ Operator training after installation

✔ After-sales service and spare parts supply

✔ Free consultation for establishing food production lines

✔ Experience in implementing projects throughout the country

Ettehad Noavaran Services

At Ettehad Noavaran, we provide a wide range of services for establishing and developing food production lines, including:

• Biscuit production line design and manufacturing
• Cookie production line design and manufacturing
• Cracker production line design and manufacturing
• Industrial tunnel oven manufacturing
• Industrial mixer manufacturing
• Material handling system design
• Packaging equipment manufacturing
• Production line optimization and upgrading
• Spare parts supply and maintenance services
• Factory setup consultation and production capacity expansion

Purchasing a Tunnel Oven and Production Line Equipment

If you are planning to establish a biscuit manufacturing plant or expand your existing production line, Ettehad Noavaran’s specialists are ready to evaluate your requirements and recommend the most suitable equipment.

All machines are designed and manufactured according to your production capacity, factory layout, and product type to ensure maximum efficiency with minimum energy consumption.

Contact Us

For free consultation, price inquiries, and placing orders for food industry equipment, contact Ettehad Noavaran through our website or social media platforms.

Website

etehadnoavaran.com

If your website includes your phone number, email address, or company address, include them in this section so customers can contact you more easily.

Social Media

Follow Ettehad Noavaran’s official pages to view completed projects, production line videos, equipment demonstrations, and the latest educational content.

• Telegram
• WhatsApp
• Rubika

Request a Free Consultation

Choosing the right equipment is the most important step toward a successful production line.

If you have any questions about selecting a tunnel oven, designing a biscuit production line, or other food industry machinery, Ettehad Noavaran’s specialists are ready to provide free consultation.

Contact us today and benefit from professional advice for establishing or expanding your production line.

Conclusion

Choosing the best fuel for a tunnel oven depends on factors such as production capacity, energy availability, operating costs, and product type.

However, for most biscuit and cookie manufacturing plants in Iran, a gas-fired tunnel oven is considered the best option due to its lower operating costs, higher efficiency, and excellent baking performance.

In areas where natural gas is unavailable or limited, diesel-fired or dual-fuel tunnel ovens provide a practical solution for maintaining continuous production.

Frequently Asked Questions

What is the best fuel for a tunnel oven?

If you have access to natural gas, a gas-fired tunnel oven is the best choice.

Is an electric tunnel oven better?

It offers highly accurate temperature control, but energy costs are usually higher for large production capacities.

Does a diesel-fired tunnel oven produce lower-quality products?

No. If the burner and heat transfer system are properly designed, baking quality can be excellent.

Can a diesel-fired tunnel oven be converted to natural gas?

Yes. In many models, replacing the burner and making certain technical modifications allows conversion. However, this should be performed by the manufacturer or a qualified specialist.

Why Is Choosing the Right Tunnel Oven Manufacturer Important?

Even the best fuel cannot compensate for poor oven design. Factors such as construction quality, insulation, airflow design, control system accuracy, and after-sales service have a direct impact on oven performance and service life.

For this reason, selecting an experienced manufacturer is extremely important.

With extensive experience in designing and manufacturing food processing equipment and biscuit production lines, Ettehad Noavaran designs and manufactures tunnel ovens tailored to the specific requirements of each factory.

The company produces gas-fired, diesel-fired, and custom tunnel ovens using high-quality industrial components and precision control systems, while also providing installation, commissioning, and technical support services.