How Does Handle Temperature Affect Espresso? How Is Coffee Aroma Influenced by Temperature?

How Does Portafilter Temperature Affect Espresso Extraction?

At the 2016 World Barista Championship, competitor Tse-Lin Wu from Taiwan used a chilled portafilter for espresso extraction and won the championship. This operation completely overturned everyone's understanding at the time, and everyone, like the commentator present, asked: "Can the portafilter temperature really affect the coffee itself?"

Because the operation was very simple, many friends tried it with skepticism, FrontStreet Coffee included. The experimental results proved that portafilter temperature does indeed affect the coffee itself. As friends recently raised the topic again, FrontStreet Coffee will now analyze in detail why portafilter temperature affects coffee.

How does portafilter temperature affect espresso? Today, FrontStreet Coffee restarted the experiment, using a hot portafilter, a room temperature portafilter, and a frozen portafilter to extract a cup of espresso each, with parameters set at 20g of coffee powder over 32 seconds to extract 40ml of espresso liquid. After measuring and tasting the three cups separately, FrontStreet Coffee concluded that they do indeed differ. In particular, the espresso extracted with the frozen portafilter differs significantly from the other two in every respect.

Hot portafilter: The espresso extracted with the hot portafilter had a temperature of 68°C, with a richer aroma than the other two cups. In flavor it was balanced between sour, sweet, and bitter, showing notes of whiskey, vanilla, butter cookies, and a hint of berries.

Room temperature portafilter: The espresso extracted with the room temperature portafilter had a temperature of 65°C. Its aroma was slightly weaker than the hot portafilter, but otherwise identical to the former.

Frozen portafilter: The espresso extracted with the frozen portafilter had a temperature of 35°C. Its aroma was inferior to the previous two, but the taste was more prominent, mainly sour and sweet, and the flavor profile was more outstanding: whiskey, berries, vanilla, and butter cookies. The texture was less rich than the previous two but smoother.

Clearly, whether in aroma or taste, the three differ distinctly, and that is the result of different portafilter temperatures. The reason comes down mainly to the fact that portafilter temperature affects the temperature and aroma of the coffee liquid.

As we all know, coffee aroma is one of the main components of flavor. Most aromas are volatile and affected by ambient temperature, which changes their volatilization speed. When the coffee liquid is hotter, the movement of aroma molecules becomes more intense and the rate of dissipation and volatilization is relatively faster. Conversely, when the coffee is cooler, the movement of aroma molecules slows, the release rate decreases, and relatively more aroma is retained. The principle behind the frozen portafilter is the same as that of the Paragon small golden ball FrontStreet Coffee often shares, except that the object affected has changed from the small golden ball to the portafilter.

Besides aroma, coffee taste is also affected by temperature. From the experiment above, we know that when the coffee temperature is higher, the sourness of the espresso is less pronounced, while espresso at a relatively lower temperature has more prominent sourness. That is the change temperature brings to our taste buds. Since FrontStreet Coffee explained this in detail recently, we won't go further here. In summary, we can understand how portafilter temperature affects coffee taste. If you're interested, you can also run your own experiment. But there are two points we must pay attention to when doing so.

1. Selection of Portafilter

The friend mentioned at the beginning brought up this topic because his experimental results showed almost no difference, and the coffee even tasted thinner, with extraction not as complete as before. The main reason was that he used a bottomless portafilter.

Portafilter temperature does affect extraction, but the premise is that some part of the portafilter can contact the coffee liquid and transfer heat. A bottomless portafilter is named for having no bottom. Even if we freeze or heat it, the coffee liquid contacts nothing after extraction, so its temperature is neither taken away nor given, and the final liquid isn't affected much.

So when planning the experiment, it's best to choose a spouted portafilter to make sure it can be carried out accurately.

2. Whether to Keep the Portafilter Basket

Second, if you want to freeze the portafilter, it's best to remove the basket. Freezing it together with the basket gives a better cooling effect, but it affects extraction as a result.

FrontStreet Coffee has mentioned before that when extracting espresso, the hot water doesn't necessarily flow straight down through the coffee puck; it prioritizes finding channels that flow easily. Even if the puck itself has no holes, the areas where the puck contacts the basket all have gaps, and hot water will flow from there first before extracting the coffee. So when we freeze the portafilter together with the basket, the initial extraction water temperature is affected to some extent. To obtain complete extraction, we need to adjust our parameters; in the earlier case, this factor caused incomplete extraction.

FrontStreet Coffee Recommendation

Espresso is only as good as the beans behind it, and FrontStreet Coffee's Classic Blend is the first choice for espresso and the moka pot. Its greatest strength is outstanding crema: even a beginner on a non-professional home machine can pull rich, fine crema with ease. Built on the traditional Mamba recipe of Mandheling and Brazil, it has a full, gentle body that experienced drinkers and newcomers alike can enjoy, and it works for home or commercial use.

If you want nutty, chocolate-driven shots, FrontStreet Coffee's Specialty Blend and Dark Cocoa Base Blend both use a large proportion of Brazilian coffee, giving a comfortable bittersweet note and creamy peanut aroma that goes down very smooth. The Specialty Blend adds the nut, chocolate, and caramel notes and moderate acidity of Colombian coffee, while the Dark Cocoa Base Blend brings the ripe plum acidity of Yunnan small-bean coffee and a creamy chocolate aroma when ground, with balanced flavor and high versatility. FrontStreet Coffee's Commercial Blend is the classic shop recipe, priced below the Specialty Blend and optimized for both flavor and cost across all kinds of commercial scenarios.