Updated 20 September 2026 · Science Brewing, Halmstad
Compare coffee roasters for cafés, hotels and small roasteries
In short: the choice is usually decided not by the machine but by the room. The circuit, the smoke and the building work rule out more options than capacity and taste do. So start at the top of the table, not the bottom.
What this page is, and is not
- A way into four deeper comparisons. Every row in the table is worked through on a page of its own.
- Competitors’ figures come from the manufacturers’ own pages, with dates. Where we lack a figure, we say so.
- We build one of the machines. Every comparison says when another machine is the right choice.
The machines side by side
The infrastructure rows come first, because they decide whether the machine fits at all. Capacity, software and taste are worked through on each comparison page.
| Question | Science Brewing Roaster | Bellwether Shop Roaster | Roest P3000 | Aillio Bullet R2 Pro |
|---|---|---|---|---|
| Power supply | 230 V single-phase, dedicated 10 A circuit. Current limit adjustable 8–16 A | 200–240 V single-phase, 30 A dedicated circuit, 5 kW | Four versions, chosen at purchase: from three-phase 400 V 16 A to single-phase 230 V 32 A | 2,300 W single-phase, 12 A at 230/240 V according to the manufacturer |
| Does a standard single-phase 10–16 A circuit do? | Yes | No | No | Yes, but not on 10 A |
| Smoke handling | Cyclone, water wash, HEPA and activated carbon in the machine. No afterburner | Internal afterburner, ventless | Twin outlets, duct out of the building | Depends on the set-up. Extraction through the wall or a duct |
| Requires building work | No | Yes, if a new 30 A circuit has to be run | Yes, a duct and usually three-phase | Yes, if the extraction needs a hole in the wall |
| Weight | About 30 kg | 183.7 kg | See the manufacturer’s figure | See the manufacturer’s figure |
| Noise level in dB | Not published | Not published | 69 dB according to the manufacturer | Not published |
| Price excluding VAT | 6.552 € | €13,900 | €32,900 | About SEK 59,125 including VAT from a Swedish reseller |
| The full comparison | — | Read the comparison | Read the comparison | Read the comparison |
Figures for other machines are taken from the manufacturers’ own pages and verified on 18 September 2026. Prices and lead times change — ask for a quote before you do the maths. The capacity rows are on each comparison page, where the calculation is shown.
Which comparison should you read?
Four pages, four different questions. Choose the one closest to yours.
I don’t know whether my premises can take it
The most common question, and the one that stops the most projects. Eight points on the circuit, heat, humidity, fire and the authorities, with a premises check you can do yourself in a quarter of an hour.
A coffee roaster without a chimney: what your premises actually need
I am choosing between electric and gas
The technology choice, row by row: installation requirements, what has to be brought into the premises and what each option costs to keep running.
Electric or gas roaster for cafés, hotels and small roasteries
I am looking at a specific machine
Three comparisons against named machines, with the same rows in all three and a section of its own on when the other machine is the right choice.
- Science Brewing Roaster or Bellwether Shop Roaster — ventless against ventless, and the difference in the circuit
- Science Brewing Roaster or Roest P3000 — production roaster against benchtop machine
- Science Brewing Roaster or Aillio Bullet — the tabletop roaster as the next step
I already run a roastery and need a sample roaster
A different question from the ones above: which sample roaster you need, and when you don’t need one at all.
Sample roaster: which one you need, and when you don’t need one
The numbers behind the rows
Circuit, power, dimensions, clearances, water, chaff and network for our own machine are collected in one place, with what we have measured and what we have not spelled out.
→ Installation and technical requirements
And environmental rules, briefly: they depend on the country and the volume. In Sweden, for example, notification is only required above 100 tonnes of coffee a year, whichever machine you choose. Check the rules where you are. What a machine can remove is the chimney, the building work and the risk of odour counting as a nuisance.
When none of them is right
Three situations where a roaster of your own is not the answer, worth knowing before you read on:
- Your brewing equipment is on loan against volume. Then the coffee contract is tied to the machines at the bar, and roasting is not the first thing to solve.
- The volume is too small. If you pay less than about €14 per kilo today, the saving is too thin to carry an investment.
- Contract roasting is enough. If you want your own coffee but not your own production, there are roasteries that roast your profile under your name.
Two ways forward
1. Talk about your choice
Tables decide whether the machine fits. A meeting decides whether it suits you — even if you end up with a different machine.
2. Buy or lease
If you have already decided: the machine can be bought today, delivery 3–6 months. Or write to us.
Buy or leaseFrequently asked questions
Which coffee roaster asks the least of your premises?
Of the machines in the table, Science Brewing Roaster: 230 V single-phase on a dedicated 10 A circuit, no duct and no building work. Bellwether is also ventless but needs a dedicated 30 A circuit, which a typical café rarely has. Roest P3000 needs a duct and usually three-phase.
Why is 10 A enough for one machine and not another?
It comes down to how the smoke is handled. An afterburner has to heat the exhaust until the smoke burns, and that costs electricity. Science Brewing Roaster cleans in four steps instead — cyclone, water wash, HEPA and activated carbon — without an afterburner, and avoids that load.
Do you need an environmental permit to roast coffee?
It depends on the country and the volume. In Sweden, for example, notification is only required above 100 tonnes a year, whichever machine you choose. Ask your local authority.
Can the machines’ capacity be compared directly?
Only if the figures are calculated on the same basis. Manufacturers state theoretical capacity, and that figure assumes someone feeds the machine without a break. Ask instead how far the machine runs between two interventions. The calculations are on each comparison page.
Do you only sell your own machine?
We build one of them, and we say so plainly. Every comparison has a section of its own on when the other machine is the right choice, written to be useful even if you end up there.
Talk about your choice
Tell us what you run and which machines you are looking at. We will tell you what we know about them, even when the answer is a machine other than ours.
Who we are
Science Brewing exists to end bad coffee. We sell green coffee and build Science Brewing Roaster and Science Brewing Grinder. We roast our own production on the machine in Halmstad, Sweden.