The Speed of Heat: How to roast more coffee, faster!

from Filter Stories - Coffee Documentaries · host James Harper

To roast coffee faster, you need to turn up the heat….right? No! In this episode, we explore the three powerful methods of heat transfer that revolutionised roasting. We’ll journey from humble beginnings—when roasting three kilos took half an hour—to machines that now roast hundreds of kilos of coffee in the time it takes you to boil a kettle. But beans roasted at lightning speed look strange, and taste… well, you’ll find out. Join us as we test-drive an industrial tangential roaster where first crack remind me of fireworks crackers. We also see the whale-sized roaster so massive it’s worth you a Guinness World Record. We have the technology today to roast coffee faster than ever, so why aren’t we all roasting at recording-breaking speeds? --------------- Please spread the word about The Science of Coffee! Leave a 5 star rating on Spotify Follow me on Instagram and tag me in an Instagram story Write a review on Apple Podcasts Discover how I make these Filter Stories episodes by subscribing to my Substack newsletter Check out the Probat roasters mentioned in this episode: Emmerich Spherical Roaster - "Pink Hydrant" Large ball roaster - “Sputnik in a pizza oven” G45 early drum roaster - “Old school steam train” Early tangential roaster Sample tangential roaster - "Shoebox" Neptune 4000, the largest drum roaster in the world! - "The whale" And there are lots of other specialty roasters from Probat I didn't have time to showcase, including their new hydrogen powered roasters. See them all for yourself!. Theodor von Gimborn's wikipedia page Go deeper into the science of roasting Read Mark Al-Shemmeri’s coffee roasting blog Do a Certificate of Advanced Studies with the Coffee Excellence Centre Explore Barista Hustle's online roasting learning Learn more from Morten Münchow and his coffee roasting courses Read Morten’s paper in collaboration with the University of Copenhagen on Roasting Conditions and Coffee Flavour Follow Filter Stories on Instagram for my infographics Learn more about first crack on my episode Coffee Roasting, Part 1: How heat transforms coffee beans Season 3 is made possible by these leading coffee organizations: The Coffee Quest | BWT | TODDY | Algrano | Probat Check out Standart, the award-winning coffee magazine. Get a free magazine and a free bag of coffee by clicking here. Support hundreds of thousands of coffee farmers with Fairtrade. Discover how here. See the Mikafi countertop roaster at the Thermoplan stand (6637) at World Of Coffee Brussels. Not attending? See it here. What does the Marco MilkPal look like to you? WALL-E? Something Steve Jobs would be proud of? Check it out here. "Seize the Moment", the tabletop device from DiFluid that guides your customers through their coffee as it cools. Use code FILTER and this link to get 10% off.

What this episode covers

To roast coffee faster, you need to turn up the heat….right? No! In this episode, we explore the three powerful methods of heat transfer that revolutionised roasting. We’ll journey from humble beginnings—when roasting three kilos took half an hour—to machines that now roast hundreds of kilos of coffee in the time it takes you to boil a kettle. But beans roasted at lightning speed look strange, and taste… well, you’ll find out. Join us as we test-drive an industrial tangential roaster where first crack remind me of fireworks crackers. We also see the whale-sized roaster so massive it’s worth you a Guinness World Record. We have the technology today to roast coffee faster than ever, so why aren’t we all roasting at recording-breaking speeds? --------------- Please spread the word about The Science of Coffee!Leave a 5 star rating on SpotifyFollow me on Instagram and tag me in an Instagram storyWrite a review on Apple Podcasts Discover how I make these Filter Stories episodes by subscribing to my Substack newsletter Check out the Probat roasters mentioned in this episode: Emmerich Spherical Roaster - "Pink Hydrant" Large ball roaster - “Sputnik in a pizza oven” G45 early drum roaster - “Old school steam train” Early tangential roaster Sample tangential roaster - "Shoebox" Neptune 4000, the largest drum roaster in the world! - "The whale" And there are lots of other specialty roasters from Probat I didn't have time to showcase, including their new hydrogen powered roasters. See them all for yourself!. Theodor von Gimborn's wikipedia page Go deeper into the science of roasting Read Mark Al-Shemmeri’s coffee roasting blog Do a Certificate of Advanced Studies with the Coffee Excellence Centre Explore Barista Hustle's online roasting learning Learn more from Morten Münchow and his coffee roasting courses Read Morten’s paper in collaboration with the University of Copenhagen on Roasting Conditions and Coffee Flavour Follow Filter Stories on Instagram for my infographics Learn more about first crack on my episode Coffee Roasting, Part 1: How heat transforms coffee beans Season 3 is made possible by these leading coffee organizations: The Coffee Quest | BWT | TODDY | Algrano | Probat Check out Standart, the award-winning coffee magazine. Get a free magazine and a free bag of coffee by clicking here.Support hundreds of thousands of coffee farmers with Fairtrade. Discover how here. See the Mikafi countertop roaster at the Thermoplan stand (6637) at World Of Coffee Brussels. Not attending? See it here.What does the Marco MilkPal look like to you? WALL-E? Something Steve Jobs would be proud of? Check it out here."Seize the Moment", the tabletop device from DiFluid that guides your customers through their coffee as it cools. Use code FILTER and this link to get 10% off.

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The Speed of Heat: How to roast more coffee, faster!

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This episode is 52 minutes long.

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This episode was published on March 24, 2025.

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