Coffee Roaster Running Costs: Per Hour, Per Kilo, Per Year — by Machine Size

Table 1: What It Burns Per Hour

A drum roaster's burner does not run flat out for the whole batch; real consumption averages well below the rated maximum. Working figures across a normal roast cycle:

Darker roasts, fuller drums and cold rooms push toward the top of each range; your own figures settle within a month of logging. Natural gas users: convert by energy content — one kilo of LPG is roughly 1.3 m³ of natural gas.

Table 2: What That Means Per Kilo of Green

Divide the hourly figure by the kilos you roast in that hour. On a 6 kg drum running 5 kg batches three to four times an hour:

Put your own two prices in the last column. Whatever they are, heating a kilo of coffee costs less than the bag it goes into — and the difference between gas and electric heating, which buyers spend weeks on, is a few cents a kilo. That is why our advice in the gas vs electric guide is to choose by what your building has, not by the fuel bill.

Table 3: What to Set Aside Per Year

A rule that holds across the range: 1–2% of the machine price per year keeps a drum roaster in consumables indefinitely. On an SD-6 Pro at USD 12,999 that is USD 130–260 a year, most of it bearings and probes. The maintenance schedule sorts the jobs by who does them, and the starter spares kit that ships in the crate covers the first two years.

What an Afterburner Adds — and What an ESP Does Not

If your rules require a thermal afterburner, budget its gas as roughly a second burner running whenever you roast: on a 12 kg drum that is another 1–2 kg of LPG an hour, and on a production line it is a real monthly bill. A catalytic afterburner uses a fraction of that. An electrostatic smoke filter (ESP) draws about 0.3 kW — trivial — and needs its plates washed every three to four weeks; where the rule is about visible smoke rather than measured VOCs, it treats the problem for almost no running cost. The JD-3K for 1–3 kg drums is USD 1,500. The afterburner guide has the three questions that decide which you need.

The Machine's Share of a Bag

Take a 6 kg gas roaster through a four-hour session: 16 batches of 5 kg green, 80 kg in, about 67 kg roasted out.

• LPG: about 3 kg × your local price — call it USD 4.50
• Electricity: about 2 kWh — USD 0.40
• Consumables reserve for the session: about USD 1.50
• Machine running cost: roughly USD 0.10 per roasted kilo

Against green coffee at USD 4–12 a kilo and retail bags at 20–40 a kilo, the machine is the cheapest thing in the bag by a wide margin. Which is the real conclusion of this page: what moves your margin is green price, roasting loss, your hours and uptime — the ROI guide turns those into a payback figure — not the gas bill.

What Actually Moves the Number

Three things change running cost far more than the fuel:

1. Loading the drum properly. A 6 kg drum at 3 kg uses nearly the same gas per batch as at 5 kg and gives you 40% less coffee for it. Load at 60–80% of rating — the batch size guide explains why.
2. Back-to-back batches. Warm-up is the most expensive part of a session; one long session beats two short ones.
3. Clean airflow. A duct half-blocked with chaff makes the burner work harder for the same curve, and it is a fire risk. The cyclone empties every session.

Frequently Asked Questions

How much gas does a coffee roaster use?

A 5–6 kg machine averages roughly half a kilo to a kilo of LPG per roasting hour, a 1–2 kg machine a fraction of that, and a 30 kg drum three to five kilos. The number depends on roast level, batch size and how cold the room is, so log a month and use your own figure. Whatever it is, per kilo of coffee it comes to a few cents.

Is an electric roaster more expensive to run than gas?

Usually a little, from 3 kg upward, because a heating element delivers kilowatt-hours that a burner delivers more cheaply in most markets; on a 1–2 kg drum the gap is pennies either way. Where power is cheap or gas is not allowed in the building, electric earns its place. Choose the build by your premises and your supply, not by the fuel line of the budget — it is the smallest line on it.

What should I budget for spare parts each year?

One to two percent of the machine price covers bearings, belts, gaskets and probes on a normal schedule — a couple of hundred dollars a year on a 6 kg machine. Keep the starter kit that ships with the roaster on a shelf, reorder what you use, and you will rarely wait for a courier. The bigger cost of a missed bearing is the day the machine stands still, not the part.

Does an afterburner double my gas bill?

A thermal afterburner adds consumption comparable to the roaster's own burner while you roast, so on the roasting hours it can come close to doubling the gas. A catalytic unit adds far less, and an electrostatic filter adds almost nothing but only removes smoke and oil, not odour. If your authority allows the filter, it is the cheapest way to keep neighbours happy; if it requires an afterburner, put its gas on the budget from day one.

Can you give me the figures for my exact model and prices?

Yes — send the model, your gas and electricity prices, and how many hours a week you will roast, and we return the consumption line for that machine and a cost per kilo in your currency. It takes a day. Most buyers find the number is small enough to stop worrying about and go back to the two that matter: green coffee and hours.

Final Thoughts

Coffee roaster running costs are three tables: what it burns per hour, what that is per kilo, and what you set aside per year. Fill in your own gas and power prices and the machine turns out to be a few cents in every bag. Send us your model and your prices and we will complete the tables for you. Talk to our engineers.

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Written by Leon, Sales Engineer at Yoshan. Our factory has built commercial coffee roasters since 1990.