Question 1

what's the actual batch size range on Giesen roasters?

Accepted Answer

Giesen publishes minimum and maximum batch weights for each model. the W6A runs 1-6 kg, the W15A handles 3-15 kg, the W30A does 6-30 kg, and the W45A spans 10-45 kg. the W1A sample roaster works from 100 grams to 1 kg. these ranges give you decent flexibility, though you'll get best results staying in the middle third of the capacity rather than pushing the extremes. lower minimums help when you're testing new origins or running small lot sizes without compromising roast quality.

Question 2

do Giesen roasters require three-phase power?

Accepted Answer

depends on the model and heat source. gas-fired models like the W6A and W15A run on single-phase 230V or 120/240V connections with relatively low electrical draw (under 2 kW for the W6A), since the gas burner provides roasting heat. electric versions like the W6E need three-phase 400V power and pull significantly more current (up to 17 kW maximum on the W6E). check your facility's electrical service before ordering. most small to mid-size roasting spaces can handle the gas models without electrical upgrades.

Question 3

what kind of gas connection do these machines need?

Accepted Answer

Giesen roasters typically use a 3/8" right-hand thread gas inlet at the rear of the machine. some documentation mentions 3/4" connections on certain models like the W15A. they're designed for natural gas at specific pressures (around 9.5 mbar for G20 European natural gas), but can be configured for propane with different injectors and pressure settings. you'll need to verify your local gas type and pressure, then ensure the machine is set up accordingly. plan for professional gas fitting and local code compliance during installation.

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