Percolator

A percolator is a coffee brewer that continuously cycles boiling or near-boiling water upward through a tube and over a basket of coarsely ground coffee. As the water drips back down through the grounds and into the lower chamber, it is reheated and cycled through the coffee bed again. This repeated cycling produces a strong, bold, full-bodied brew.

Percolators come in two types: stovetop models heated on a burner and electric models with a built-in heating element. Electric percolators typically have an automatic shutoff or keep-warm function. Both types use a similar internal mechanism: a vertical tube carries heated water to a perforated spreader plate above the grounds basket.

The repeated cycling that defines percolation is also its biggest criticism. Because already-brewed coffee passes through the grounds multiple times, percolators tend to over-extract, producing coffee that is strong but can taste bitter, flat, or harsh compared to single-pass methods. The boiling temperature used is also higher than the ideal brewing range of 195–205°F recommended by specialty coffee standards.

Despite these drawbacks, percolators remain popular for camping, large gatherings, and situations where a strong pot of coffee for a crowd is more important than nuanced flavor. Large-capacity models can brew 30 to 100 cups, making them standard equipment for events, churches, and offices. Many people who grew up with percolator coffee also simply prefer its robust, straightforward flavor profile.