Sonofresco 1-2 lb Coffee Roasters: Specs & How They Work

If you're looking to roast small batches of coffee with precision and consistency—whether you're cupping samples or producing limited runs—you need a roaster that fits your batch size without sacrificing control. Many specialty roasters start with a 1-lb or 2-lb machine to develop roast profiles before scaling up. But which model offers the right balance of capacity, fuel flexibility, and digital control?

The Sonofresco CR1S and CR2 series offer 1-lb (120g sample) and 2-lb capacities respectively, with electronic controls for setting and monitoring roast profiles. Both are available in multiple configurations with propane or natural gas options, and feature digital displays for time, temperature, and roast progression.

Sonofresco Roaster Models: CR1S and CR2 Series

Sonofresco offers two primary small-batch roaster models: the CR1S (1-lb / 120g sample roaster) and the CR2 (2-lb production roaster). These come in several numbered variants—1100, 1200, 1300, 1400 for the 1-lb CR1S models, and 2100, 2200, 2300, 2400 for the 2-lb CR2 models. Each model shares core functionality but varies in electrical and regional specifications.

Capacity, Dimensions & Colors

The CR1S models roast up to 1.4 lbs (approximately 635g), with a dedicated 120g sample capacity. The CR2 models handle up to 2.8 lbs per batch. Dimensions vary slightly: CR1S units measure roughly 11.25x19x27 inches (28.6×48.3×68.6 cm) and weigh about 55 lbs, while CR2 units are around 13.25x20.5x28.75 inches (33.5×52.1×73 cm) and weigh approximately 65 lbs. Both series are available in Cherry Red and Stainless Steel, with the CR2 2400 also offered in Green.

Fuel Options & Electrical Requirements

All models support either Propane or Natural Gas, selected based on your facility setup. Electrical specs differ by model: Voltage ranges from 120V to 230V, Frequency from 50Hz to 60Hz, and Current from 1.5A to 3A. Power draw is 360 watts across the board. The machines are designed to work with your local voltage standard—just confirm your specs when ordering.

How the Roasters Work: Controls & Roasting Process

The roasters feature electronic control panels that manage the roast profile. Key functions include: Start Roast (begins the process and shows elapsed time), Power (main power switch), Gas (activates propane/natural gas flow), plus Up/Down arrows to adjust roast settings. A digital screen displays current settings, temperature, and roast time. Temperature can be monitored by pressing both the up and down arrows simultaneously.

To use the roaster: 1) Turn on power and gas, 2) Select a roast setting (0–9), 3) Press the Start Roast button. The system automatically begins the roast cycle. A built-in timer tracks roast duration, and the temperature display allows you to monitor heat in real time. Some models also allow comparison of your roast curve against standard profiles via an integrated graph.

Setup & Operation: Loading & Cleaning

Loading green coffee requires the included measuring cup—always use it to ensure the correct dose. For the CR1S and CR2 models, load coffee into the glass roasting chamber. The chaff (silver skin) collector, its outer cover, and the chaff filter must be assembled in sequence and fitted securely onto the glass chamber. Ensure the rubber gasket on the collector sits properly to prevent heat loss and chaff escape. The glass chamber must seal tightly with the rubber gasket. Warning: while the glass is heat-resistant, impacts can cause damage during roasting.

To remove the glass and chaff collector, lift the handle to raise the exhaust vent (~4 inches), then lift off the chaff collector and glass. Be cautious—the glass remains extremely hot. Always reassemble the chaff system before roasting to maintain proper airflow and cleanliness.

Frequently Asked Questions

What batch sizes do the Sonofresco CR1S and CR2 roasters handle?

The CR1S roasts up to 1.4 lbs (about 635g), including a 120g sample capacity. The CR2 handles up to 2.8 lbs per batch. Both are designed for small-batch or sample roasting.

What fuel options are available for Sonofresco roasters?

All models support either Propane or Natural Gas. You choose the version based on your gas supply—no conversion needed, just specify your preference when ordering.

Do the Sonofresco roasters have digital controls?

Yes. Each roaster includes an electronic control panel with a digital display showing time, temperature, and roast progress. You can adjust roast settings using up/down arrows and select from preset levels 0–9.

What are the electrical requirements for these roasters?

Voltage ranges from 120V to 230V, frequency from 50Hz to 60Hz, and current draw from 1.5A to 3A. All models use 360 watts. Check your local power specs to match the correct model.

How do you load coffee and manage chaff in the Sonofresco roaster?

Use the included measuring cup to load the correct amount of green coffee. The chaff collector, cover, and filter must be installed in order on the glass roasting chamber. Ensure the rubber gasket is seated properly to maintain heat and contain chaff. The glass chamber must seal tightly.

Recommended FrontStreet Coffee for Small-Batch Roasting

For roasters using the Sonofresco CR1S or CR2, try FrontStreet Coffee’s Ethiopia Yirgacheffe for bright citrus and floral notes, or their Colombia Huila for balanced caramel and nuttiness. Both shine when roasted on small batch roasters, letting you highlight origin character. Freshly roasted within 5 days · Orders placed before 17:00 ship the same day · Next-day delivery across most of Guangdong Province.