A 6 kg coffee roaster is the most common entry point for growing specialty roasteries: large enough to supply wholesale accounts, compact enough to fit a roastery floor without a forklift. This guide covers every decision you need to make before buying one — capacity math, heating options, automation levels, and what to expect from a Chinese manufacturer like YOSHAN.
Who Actually Needs a 6 kg Coffee Roaster?
The 6 kg batch size is the sweet spot for three types of buyers:
- Specialty roasteries scaling up from a 1–3 kg machine — you have proven wholesale accounts and need to roast 40–100 kg per day without running the drum 16 hours straight.
- Multi-location cafe groups — central roasting for 3–8 locations, roasting 2–4 times per week.
- Coffee distributors adding roasting in-house — replacing private-label contracts with your own roasted product.
If your current daily demand is under 30 kg, a 3 kg roaster is cheaper to operate. If you regularly exceed 120 kg/day, skip the 6 kg and look at 12–15 kg machines instead.
Capacity Math: What Does 6 kg Actually Produce?
A 6 kg roaster does not produce 6 kg per batch in practice. Green coffee loses 14–20% weight during roasting (moisture + chaff). Realistic numbers:
| Load size | Roasted output (17% loss) | Batches/day (8 hr shift) | Daily output |
|---|---|---|---|
| 3.5 kg green | ~2.9 kg roasted | 18–20 | 52–58 kg |
| 5 kg green | ~4.2 kg roasted | 16–18 | 67–76 kg |
| 6.5 kg green (max) | ~5.4 kg roasted | 14–16 | 76–86 kg |
A realistic sustainable output for a 6 kg roaster is 50–75 kg roasted coffee per 8-hour shift. Overloading the drum (running at max every batch) shortens bearing and burner life.
Heating Options: Gas vs Electric
Most 6 kg roasters are available in three heating configurations:
- LPG (propane) — most popular globally. Fast heat-up, precise flame control, works anywhere with a gas cylinder. YOSHAN YS-6KG uses 0.68 m³/hour LPG.
- Natural gas (NG) — lower fuel cost than LPG if you have a mains supply. Same machine, different burner nozzle. YOSHAN YS-6KG uses 1.9 m³/hour NG.
- Electric — 380V three-phase required. Higher energy cost per batch than gas, but no gas permit, no ventilation permit in many jurisdictions. Good for urban roasteries in strict emission areas.
Automation: Semi-Auto vs Full-Auto PLC
6 kg machines come in two automation tiers:
- Semi-automatic — you set drum temp, airflow and time manually. The roaster holds your settings. You adjust in real time using Artisan software data logging. Lower upfront cost; requires an experienced roaster.
- Full-automatic PLC — you program a roast curve (or select from presets), the Siemens or Chinese PLC executes it automatically batch after batch. Temperature difference held within ±0.1°C. Higher cost; essential for production consistency and for training non-specialist staff.
YOSHAN offers the YS-6KG with Siemens touch-screen PLC as standard — one of the few 6 kg machines at this price point using genuine European automation components.
Key Specifications to Compare
| Specification | YOSHAN YS-6KG |
|---|---|
| Batch capacity | 1–7 kg green per batch |
| Drum material | Cast iron (holds heat longer, more even roast) |
| Roast cycle | 12–15 min/batch (after preheat at 180°C) |
| Cooling time | 1–2 minutes |
| Heating options | LPG / Natural Gas / Electric (380V 3-phase) |
| Control system | Siemens PLC touch screen |
| Machine dimensions | 2151 × 720 × 2000 mm (W×D×H) |
| Net weight | 600 kg |
| Temperature range | 0–400°C adjustable |
| Thermocouples | German dual (bean temp + air temp) |
| Certifications | CE, SGS, ISO 9001, RoHS |
| Colors | Black / White / Red / Blue / Yellow / Custom RAL |
Floor Space and Installation Requirements
A 6 kg roaster needs more space than the machine footprint. Plan for:
- Clearance: 1 m behind (exhaust access), 0.8 m on each side, 0.5 m in front of cooling tray
- Ceiling height: minimum 3 m recommended; exhaust duct rises before exiting
- Exhaust duct: 150–200 mm diameter stainless steel, as straight a run as possible to chimney or filter
- Gas supply: 3/4 inch line at minimum 2 kPa pressure for LPG or NG models
- Electrical: 220V single-phase for gas models (control panel); 380V three-phase for electric heating option
If your roastery is in a residential building or a jurisdiction with strict smoke regulations, add an ESP smoke filter or afterburner to the quote — YOSHAN offers matched models for 6 kg machines.
Shipping and Lead Time
A 6 kg roaster from China ships in a wooden crate by sea freight. Typical timeline:
- Production lead time: 25–40 working days
- Sea freight to USA West Coast: 18–22 days
- Sea freight to Europe: 28–35 days
- Sea freight to Australia/NZ: 22–28 days
YOSHAN ships worldwide DDP (Duty Delivered Paid), FOB Shenzhen, or CIF — your choice. Request freight options when you send your inquiry.
The YOSHAN YS-6KG: Our Recommendation
The YS-6KG is YOSHAN’s Giesen-inspired cast-iron roaster with Siemens PLC as standard equipment. It is one of the few 6 kg machines on the market offering genuine European-brand automation at a Chinese factory price. Key differentiators over generic 6 kg machines:
- Independent Siemens touch-screen control station (not a generic Chinese PLC clone)
- German dual thermocouples for simultaneous bean and air temperature measurement
- Four independent Japanese ADDKA motors for drum, cooling, fan and stirring plate
- Separated dust-collection bucket (does not recirculate chaff heat into machine)
- Electroplated 304 stainless steel shell — anti-corrosion, anti-humidity
- Large independent stirring cooling plate for 1–2 minute cooling and true 24-hour continuous roasting
CE, SGS, ISO 9001 and RoHS certified. Available in gas (LPG or NG) or electric. OEM branding from 1 unit.
