Diedrich IR-2.5TT 2.5kg Coffee Roaster Specs & Features

If you’re shopping for a small-capacity coffee roaster that doesn’t compromise on commercial durability, you’ve likely come across the Diedrich IR-2.5TT. But what makes this 2.5kg-capacity machine stand out among other home or light-commercial roasters? It’s not just the brand name—it’s the build quality, efficiency, and flexibility baked into every component.

The Diedrich IR-2.5TT roasts between 250g and 2.5kg per batch, outputs up to 7.35kg per hour, and features an infrared gas heating system for consistent roasting with reduced NOx, CO, and CO2 emissions. It’s built with commercial-grade stainless steel, offers over 60 color choices at no extra cost, and boasts improved fuel efficiency by 40–60% compared to conventional designs.

What Is the Diedrich IR-2.5TT Roaster?

The Diedrich IR-2.5TT is a gas-fired, infrared-heated coffee roaster designed for both home enthusiasts and small commercial operations. It bridges the gap between personal use and professional throughput with a batch capacity ranging from 250 grams to 2.5 kilograms. Its hallmark is the infrared heating system, which ensures even heat application across the bean mass and supports precise temperature control throughout the roast cycle.

Key Technical Specifications

The IR-2.5TT is packed with specifications geared toward consistency and longevity:

• Batch Capacity: 250 g – 2.5 kg
• Hourly Output: 7.35 kg
• Roaster Weight: 186 kg
• Dimensions (L × W × H): 173 × 115 × 72 cm
• Max Temperature: 251°C
• Exhaust Temperature: 48.89°C

It operates on 230V electrical input, drawing 3.1A at full load. Gas consumption varies with load: 4.7kW when full, 2.72kW during standard use. The exhaust system is optimized for airflow, with a 15.24cm diameter flue, 245–306m³/h exhaust efficiency, 224m³/h airflow, and 206m/min velocity. Required pressure range is -0.37 to +0.62 millibars.

Build & Design Advantages

The roaster isn’t just about raw numbers—it’s built to meet the demands of both home hobbyists and specialty roasters:

• Material: Commercial-grade stainless steel throughout, including the cooling tray, meeting organic food standards.
• Color Options: Over 60 color finishes available at no added cost.
• Heating System: Infrared gas heating delivers uniform roasting and reduces harmful emissions (NOx, CO, CO2).
• Cooling Tray: Newly designed for easy cleaning and efficient cooling.
• Maintenance: Large internal pathways simplify cleaning and allow straightforward installation of after-market chaff collectors.
• Control Features: Internal thermal (synchronous) heat exchanger, precise bean and environment temperature controls, multi-directional airflow configuration, and support for continuous roasting.

These features not only improve day-to-day usability but also contribute to longer equipment life and better roast consistency.

Fuel Efficiency & Emissions

One of the IR-2.5TT’s most compelling advantages is its fuel efficiency. Compared to conventional roasters, it offers a 40–60% improvement in gas utilization. This is paired with low-emission performance: reduced nitrogen oxides (NOx), carbon monoxide (CO), and carbon dioxide (CO2), aligning with more environmentally conscious roasting practices. The combination of infrared heating and precision temperature management helps achieve this without sacrificing roast quality.

Frequently Asked Questions

What is the batch size range for the Diedrich IR-2.5TT?

The IR-2.5TT accommodates batch sizes from 250 grams up to 2.5 kilograms, making it suitable for both small-batch home roasting and light commercial use.

What type of heating system does the Diedrich IR-2.5TT use?

It uses an infrared gas heating system, which provides even heat distribution for consistent roasting and reduces emissions of NOx, CO, and CO2.

How much does the Diedrich IR-2.5TT weigh?

The roaster weighs 186 kilograms, reflecting its robust, commercial-grade construction.

What are the dimensions of the Diedrich IR-2.5TT?

It measures 173 cm (length) × 115 cm (width) × 72 cm (height).

How many colors can I choose for the Diedrich IR-2.5TT, and is there an extra charge?

The roaster comes in over 60 color options, all available at no additional cost.

What is the fuel efficiency improvement of the IR-2.5TT compared to traditional roasters?

It offers a 40–60% increase in fuel efficiency, thanks to its infrared heating and optimized thermal exchange design.

Recommended FrontStreet Beans for Small-Batch Roasting

For roasters using the Diedrich IR-2.5TT, FrontStreet Coffee’s Ethiopia Guji Humbera offers bright citrus, floral jasmine, and sweet blueberry notes—perfect for highlighting the roaster’s infrared precision. The Colombia Huila Popayan brings balance with caramel, almond, and mild citrus, ideal for testing development time. Finally, the Ethiopia Yirgacheffe Aricha shines with juicy berries and stone fruit, ideal for exploring light to medium roasts. All three beans respond well to the IR-2.5TT’s multi-directional airflow and temperature controls. Freshly roasted within 5 days · Orders placed before 17:00 ship the same day · Next-day delivery across most of Guangdong Province.