We investigate what goes into our favorite high-end coffee makers to find out why they perform better than the competition, and why they cost more.
. Conversely, many cheaper brewers are rated at 900 watts or lower, and took more than 10 minutes to brew. But aside from power, the actual design of the flash-heating chamber is another thing that sets these machines apart.
Both the Ratio Six and the OXO brewers use a cast aluminum coil as their heating element, which wraps around the chamber in a spiral and heats the water to boiling in just a few seconds, sending it up to the spray head after. “Cheaper models often use a horseshoe-shaped heating element that has a double purpose: also powering the hot plate,” says Ratio founder Mark Hellweg.
“During development, we extensively tested each brewing mode to ensure the coffee bed reached the optimal temperature for extraction,” says OXO category director Liz Grasing. Calibrating the brewing temperature involves tracking how much heat the water gains and loses as it travels to the showerhead, and also how much heat the coffee itself absorbs. That includes measuring how long the water lines are, how the spray head disperses the water, and even the materials that the parts are made out of.
In our testing, it was clear that the coffee bed from both of these brewers was evenly saturated, while cheaper brewers had big divots in the center. High-quality spray heads might seem like a picky detail, but they made a huge difference in our taste tests and required more engineering than the systems in cheaper brewers. Both Hellweg and Grasing explained that Ratio and OXO iterated on a number of spray head designs and extensive testing before landing on their final version.
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