Updated 20 September 2026 · Science Brewing, Halmstad
Coffee roaster: specification and installation requirements
Quick answer: a coffee roaster for a café, hotel or small roastery needs four things from the premises: power, space, somewhere for the smoke and heat to go, and a routine for what needs emptying. Science Brewing Roaster needs a dedicated 10 A circuit on 230 V, 70 × 30 cm of counter space, Wi-Fi and water in a three-litre tank. No building work.
The essentials in 30 seconds
- Always work out amps × 230 for the whole circuit, not for the socket.
- The machine draws about 1.8 kW while roasting and up to 2.3 kW while heating up. That is the full limit of a 10 A circuit, so it should have the circuit to itself.
- Space: 70 cm deep, 30 cm wide, 40 cm high, about 30 kg. Allow about 30 cm clear on the left-hand side while running.
- No chimney, no duct, no water connection and no drain. A three-litre tank is filled and emptied by hand.
- Wi-Fi is required. Without internet no new roast starts.
- At 10 A: 1.2 kg per batch in 15 minutes, 4.8 kg an hour.
Here are the specifications. You don’t have to leave your email for them.
Most makers of roasters in this class do the same thing. You find the machine, you want to know what it needs, and you get a form. The numbers come after a sales call, sometimes after two.
We do the opposite. The whole list is below: power, fuse, dimensions, clearances, intervals for water and chaff, what the price includes and the price itself. Including the rows where the answer is “we have not measured that yet”.
The reason is simple. Most roastery projects are not stopped by the machine. They are stopped by the room. And that is decided by figures you can check in a quarter of an hour, against your own fuse box and your own tape measure — long before anyone needs to call you.
What stands between you and your first batch? For this machine: a socket with a fuse of its own. Not a duct through the roof, not a landlord’s approval, not a permit for flammable goods. Plug in, machine on the network, water in the tank, beans in the hopper.
The other half of the list below applies to whichever machine you are looking at. Take it to your supplier.
The requirements list: eleven questions that decide whether the machine fits
The left column is what you need to find out. The middle one is our answers. Fill in the empty one for the machine you are comparing with — and you will quickly see which rows the supplier does not answer without being asked twice.
| Question | Science Brewing Roaster | The machine you are comparing with |
|---|---|---|
| Voltage, phases and fuse | 230 V single-phase, dedicated 10 A circuit. Current limit adjustable 8–16 A | |
| Power while roasting and while heating up | About 1.8 kW and up to 2.3 kW respectively | |
| Building work required | No | |
| How the smoke is handled | Cyclone, water wash, HEPA and activated carbon. No afterburner | |
| Water or drain | No connection. Tank of about 3 litres, filled and emptied by hand | |
| Footprint, height and clearance | 70 × 30 cm, height 40 cm. About 30 cm clear on the left while running, about 10 cm on the other sides | |
| Weight | About 30 kg | |
| Network | Wi-Fi required | |
| Noise level in dB | Not measured | |
| Intervals for what needs emptying | Water about every tenth roast. Chaff every 5–10 kg of green coffee | |
| What the price includes | See the table below |
Figures verified on 20 September 2026.
The full specification
Electrical
| Connection | 230 V single-phase, plug-in |
| Fuse | Dedicated 10 A circuit |
| Current limit | Adjustable 8–16 A. 10 A as standard |
| Power while roasting | About 1.8 kW |
| Power while heating up | Up to 2.3 kW |
| Energy per kilo of green coffee at 10 A | About 0.38 kWh (1.8 kW ÷ 4.8 kg an hour), heating up not included |
| Three-phase | Not needed |
Capacity
| Batch at 10 A | Up to 1.2 kg of green coffee |
| Roast time | About 15 minutes per batch, medium roast |
| Per hour at 10 A | 4.8 kg of green coffee |
| Theoretical maximum per day | About 115 kg (4.8 × 24). Nobody roasts around the clock — see “A day with the machine” below |
| Smallest batch run | 500 g of green coffee |
| At 16 A | Up to 2 kg in coming updates |
| At 8 A | Up to 800 g |
This is what the machine can do. How many hours that makes in your week, you can work out in What size coffee roaster do you need?
Dimensions, weight and space
| Depth × width × height | 70 × 30 × 40 cm |
| Weight | About 30 kg |
| Clearance on the left, while running | About 30 cm. That is where the air intake is |
| Clearance on the left, for service | About 80 cm must be reachable when the service hatches are opened. It does not need to be empty counter all the time |
| Clearance on the other sides | About 10 cm. The machine should not stand flush against a wall |
| Placement | A counter or table that carries 30 kg plus beans, or a stand of its own |
| Under the machine | Room for the container you collect the roasted beans in when in batch mode. The container is not included |
Smoke, water and chaff
| Cleaning | Four steps: cyclone, water wash, HEPA filter and activated carbon. Patent pending |
| Afterburner | No. That is why 10 A is enough |
| Duct or chimney | No |
| Water connection | No. Tank of about 3 litres with a level sensor |
| Topping up | The machine and the app tell you |
| Water change | When the water has turned dark, about every tenth roast, so about 12 kg of green coffee. Darker roasts dirty it faster |
| Chaff | Emptied every 5–10 kg of green coffee, depending on the bean |
| Fire risk in the chaff collector | The exhaust is water-cooled, so the chaff meets a lower temperature than in a machine without a cooling step |
Operation and software
| Heat source | Induction in three zones plus hot air. 2 mm drum |
| Controls on the machine | ON/OFF. No screen, no keypad, no controls that can be set wrong |
| How the profile is chosen | Scan the QR code on the green coffee in the app. The same coffee again needs no profile step |
| Start | At the machine or remotely from the app |
| Batch mode | The cooling tray empties automatically into a container under the machine. Three batches can be at different stages at the same time: one in the hopper, one in the drum, one in the cooler |
| Network | Wi-Fi required |
| Logs | Temperature, IR, first crack, barometer, colour measurement and power are logged per batch |
| Your own profiles | Manual mode with stepless power on both heating systems. Profiles can be imported from other roasting software |
| Outdoors | Yes, at 10 °C or warmer |
| Noise level | Not measured. We will publish a figure when it has been measured, and how it was measured |
What is included
| Price | 6.552 € excluding VAT |
| Included | The machine, the app with basic features and pre-programmed profiles, a food safety plan template for coffee roasteries (in Swedish), and support and spare parts from Sweden |
| Options | Manual mode and advanced software features. Price on request |
| Not included | Registration with your local food authority — that is up to you. The container you collect the beans in |
| Ships from | Halmstad, Sweden |
| Installation | None. One person carries the machine into place and plugs it in |
Power: the one row that stops the most projects
The rule: amps × 230 = watts, and it applies to the whole circuit, not the socket.
| Fuse on the circuit | Limit for everything on the circuit |
|---|---|
| 10 A | about 2,300 W |
| 16 A | about 3,700 W |
| Three-phase 16 A | about 11,000 W |
The machine draws up to 2,300 W while heating up. That is the full limit of a 10 A circuit. So the requirement is not “a free socket” but a circuit with nothing else large running at the same time.
The trap is the usual one: the socket in the back room often shares a circuit with the dishwasher, the fridge or the kettle. Check the circuit labels in the fuse box. If it is not listed, ask the electrician.
Do the maths
| Item | Watts |
|---|---|
| The roaster’s peak power | 2,300 |
| + everything else on the same circuit that can run at the same time | ____ |
| = total | ____ |
| The circuit’s limit (amps × 230) | ____ |
| Does the total fit? | ____ |
Why is 10 A enough when other machines in the same capacity class need more? Because the machine has no afterburner. Burning smoke requires high temperature, and high temperature costs electricity — an electric afterburner alone can draw more than a whole standard circuit. Our cleaning captures the smoke in the cyclone, water, HEPA and carbon instead. That uses almost no electricity. The price is paid in maintenance: water, filter and carbon.
The current limit is adjustable. 8 A for weak circuits and generators, 10 A as standard, 16 A where available. The machine adapts to the socket, not the other way round. At 8 A a batch holds up to 800 g. At 16 A the batch will be up to 2 kg in coming updates.
Generators and food trucks. The generator must handle the machine’s peak power, so 2,300 W at 10 A, plus everything else in the truck at the same time. Check that the socket is RCD-protected.
→ The whole premises question, eight points: can your premises take a coffee roaster without a chimney?
Space: 70 × 30 cm, and the room you don’t see in the product photo
The machine is 70 cm deep, 30 cm wide and 40 cm high. It takes up less counter space than an espresso machine.
Two figures govern placement, and they are different. While running, about 30 cm clear on the left-hand side is enough, where the air intake is. For service you need to reach about 80 cm on the same side, when the hatches are opened. That space does not have to be empty counter all the time — it needs to be possible to clear. On the other sides about 10 cm is enough, so air can get past. The machine should not be pushed flush against a wall.
Under the machine you need room for the container the cooling tray empties into in batch mode. The container is not included. Choose a food-grade container of roughly 30–70 litres, depending on how long a series you run, and measure the height of the one you choose before you decide on the counter.
It weighs 30 kg. That means three things worth knowing before delivery: one person carries it in, no tools are needed to get it into place, and you don’t need to check what the floor can carry. A counter or table that takes 30 kg plus beans is enough. If it needs to move between base and event, it can.
Cleaning, water and chaff: what needs emptying
Cleaning happens in four steps. The cyclone takes the coarse particles. The water wash cools the exhaust and captures particles and oils. The HEPA filter takes the fine ones. The activated carbon binds odours. No afterburner, no duct.
What does not disappear by itself:
| What | How often | What you do |
|---|---|---|
| Water in the tank | Fill when the machine tells you | Pour in water, about 3 litres |
| Water change | When the water has turned dark, about every tenth roast (about 12 kg of green coffee). More often with dark roasts | Pour out, rinse, refill |
| Chaff | Every 5–10 kg of green coffee, depending on the bean | Empty the container |
The plume. What you see coming out of the machine is mostly water vapour, and most of it comes from the green coffee. About 16 percent of the bean’s weight disappears in roasting, and most of that is water. At 4.8 kg an hour that is close to 0.8 kg of water and gas an hour that has to go somewhere. Indoors it is a humidity question for the room’s ventilation. Outdoors it is visible from a distance, and draws people in.
Network: Wi-Fi is required, and you should know that up front
The machine is controlled through an app and everything runs over the network. That gives remote start, logs per batch and the profile by scanning the green coffee’s QR code.
That has a price, and here it is in plain words: without internet no new roast starts. A batch already running finishes. Then it waits until the connection is back — the machine reconnects by itself, you don’t need to do anything.
In practice that means Wi-Fi must reach the room where the machine stands, even when it is a back storeroom with concrete walls, and that a food truck needs a connection on site or should roast at its base. Check the coverage with your phone where the machine will stand, before delivery.
Heat and humidity in the room
Without a duct, practically every kilowatt the machine draws becomes a kilowatt of heat in the room. A machine drawing 1.8 kW for several hours heats like a radiator at nearly full power. In a windowless storeroom you notice it after a morning.
Do the maths
| Item | Value |
|---|---|
| Kilos of green coffee per hour | ____ |
| × 0.16 | ____ kg of water and gas per hour |
| The machine’s power in kW | ____ |
| = roughly how much heat the room has to take | ____ kW |
This applies to every machine without a duct, not just ours.
A day with the machine
The theoretical maximum is 115 kg a day. That figure is for comparing machines, not for planning a week. This is what a real day looks like.
| Task | Time | How often |
|---|---|---|
| Fill the hopper with green coffee | About 10 seconds | Every 15 minutes, in batch mode |
| Start in the app | About 10 seconds | Per batch, or once for a series |
| Change the water | A minute or so | About every tenth roast, so about every 2.5 hours |
| Empty the chaff | A minute or so | Every 5–10 kg of green coffee |
What the machine takes away is not the work. It is the waiting. Nobody needs to stand by it during the roast, and nobody needs to be a trained roaster to start it. Batch mode empties the cooling tray by itself, so batches can follow one another.
Two conditions apply to unattended operation, whatever the make: the machine must be built for it, and your insurer must accept it. Ask both.
A practical planning rule: plan for about 12 kg of green coffee between two interventions, not for the daily maximum.
Delivery day: what to have sorted beforehand
| Before delivery | Who answers |
|---|---|
| A 10 A circuit with nothing else large running at the same time | The electrician, or the circuit labels |
| 70 × 30 cm of counter that carries 30 kg, with 30 cm clear on the left | You |
| A food-grade container of about 30–70 litres for the roasted beans | You |
| Wi-Fi that reaches the spot | You, test with your phone |
| Ventilation that can take a couple of kilowatts of heat and humidity | The landlord |
| Food business registration, or notification of the change | Your local food authority. A food safety plan template is included, in Swedish |
| Approval for unattended operation | Your insurer |
Then: plug in, machine on the network, water in the tank, beans in the hopper, scan the QR code.
Authorities and rules, briefly
Roasting is food production. A food business must be registered with the local food authority before it starts. If you already run a café or restaurant, notify the change.
Environmental permits depend on the country and the volume. Some countries have permit or notification thresholds for coffee roasting based on annual volume. In Sweden, for example, notification is only required above 100 tonnes a year — whichever machine you choose. Check the rules where you are, and whether your local authority charges fees for small-scale roasting.
What the machine removes is not the rules. It is the chimney, the building work and the risk of odour counting as a nuisance for the neighbours.
We have written a food safety plan template for coffee roasteries: hazard analysis, routines, logs and a checklist for registration. It is a Word file in Swedish.
Compare with a named machine
This page describes one machine and a requirements list. If you are looking at a particular make, the figures are side by side here:
Three ways forward
1. Buy or lease
The machine can be bought today. Delivery 3–6 months from order. Leasing over 36 or 60 months adds up to exactly the purchase price.
Buy or lease2. Talk to us
About placement, power or the machine. Send a photo of the fuse box and the room, or take the Space Test first. We will tell you what your circuit can take and what to ask the electrician, whichever machine you end up with.
3. Not sure?
Run the machine in your own business for six months and decide afterwards. How the evaluation works.
This is not for you if
- Your brewing equipment is on loan against volume from your coffee supplier
- You pay less than about €14 per kilo today
- You want to roast in a small unventilated room
- You roast more than about four hours per roast day and cannot add more roast days
- You have no stable internet connection where the machine would stand
- You are looking for a coffee roaster for private use
Frequently asked questions
How much electricity does a coffee roaster use?
It depends entirely on how the smoke is handled. A machine with an afterburner draws several extra kilowatts just for the cleaning. Science Brewing Roaster draws about 1.8 kW while roasting and up to 2.3 kW while heating up, so about 0.38 kWh per kilo of green coffee at 10 A.
What fuse does a coffee roaster need?
From a standard 10 A circuit to three-phase or a dedicated circuit with a high fuse, depending on the machine. Work out amps × 230 for the whole circuit and add everything else that can run at the same time. Science Brewing Roaster needs a dedicated 10 A circuit.
How big is a coffee roaster?
Science Brewing Roaster is 70 cm deep, 30 cm wide and 40 cm high and weighs about 30 kg. Allow about 30 cm clear on the left-hand side while running, about 80 cm reachable for service, and about 10 cm on the other sides.
Does a coffee roaster need a water connection?
Not this one. The cleaning uses water, but from a tank of about 3 litres that is filled and emptied by hand. No connection and no drain are needed.
How often does the water need changing?
When it has turned dark, about every tenth roast, so about 12 kg of green coffee. Darker roasts dirty it faster.
How often does the chaff need emptying?
Every 5–10 kg of green coffee, depending on the bean.
How much coffee can you roast per day?
At 10 A Science Brewing Roaster roasts 1.2 kg in 15 minutes, so 4.8 kg an hour and theoretically about 115 kg a day. Theoretical daily figures are what manufacturers state, but nobody roasts around the clock. Ask instead how far the machine runs between two interventions. For ours: about 12 kg.
What is the smallest batch?
500 g of green coffee is the smallest batch run.
Does the coffee roaster need internet?
Yes. Control runs through an app over the network. Without internet a roast already started can finish, but no new one starts. The machine reconnects by itself when the network is back.
Can the machine run unattended?
It is built for it: enclosed, water-cooled exhaust, protection in hardware and software. Two things still decide: what the manufacturer says and what your insurer accepts. Ask both, whatever the make.
How loud is a coffee roaster?
We have not measured ours in dB and so publish no figure. Ask every supplier for dB and how it was measured. Run a roast on the premises before you decide on placement.
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.
How much does Science Brewing Roaster cost?
6.552 € excluding VAT. The price includes the machine, the app with basic features and pre-programmed profiles, a food safety plan template for coffee roasteries (in Swedish), and support and spare parts from Sweden.
Talk to us
Tell us where the coffee roaster would stand and how you buy coffee today. Unsure about the power? Reply to the confirmation email with a photo of the fuse box and the room.
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 described on this page, in Halmstad, Sweden.