Above: The difference in temperature between Stagg [XF] (red line) and other flat bottom single wall dripper (blue line) during brew over time. One note: you are seeing an increase in temperature because so many components are stealing heat from the initial hot water pour (coffee grounds, paper, air, carafe, etc.). At about the one minute mark, you see brewed coffee temp increasing to around desired temp.  

It gets very interesting if you look at the “temperature out” plot (the coffee temp) measured over time. We ran a series of tests brewing with Stagg [XF] and other single wall drippers into our double wall carafe with the same pour rates, same coffee, same water brew temperature, etc.

The double wall outperformed single wall in two ways:

• During the first minute of brewing, stainless steel double wall rises the coffee temperature to the desired temp faster. This is because you’re losing less heat to the atmosphere around you.
• Once at the desired brew temp, Stagg [XF]’s double wall keeps the air around your dripper from pulling heat away via convection, resulting in a more consistent temp during brew.

 
So what does this mean for you and your coffee nerding? Well fellow coffee lover, by having a dripper that better regulates temperature during your brew, you have more wiggle room to play with the intersection of temperature and grind size for extraction. Our friends over at  have been brewing with [XF] at their bar at temperatures as low as 185 Fahrenheit. Because they have seen [XF] maintain their desired temperature more consistently, brewing at lower temperatures is possible. Brewing at such a low temp means they can keep the extraction time longer and play with a smaller grind size without risking over extraction. A finer grind plus a longer extraction time at a lower temp can lead to delicate flavors that might not be coaxed out at a faster extraction with less surface area exposed to water. In fact, Conor Poull from West Oak Coffee Roasters competed with Stagg [XF] Dripper in his routine for the U.S. Brewers Cup in Seattle this past April.

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