Karlsbad Brewer (Karlsbader Kanne)

The Karlsbad brewer originated in Karlsbad (now Karlovy Vary, Czech Republic), a famous spa town in the Austro-Hungarian Empire, in the early 19th century. The design was developed by local porcelain manufacturers who created a brewing device entirely from porcelain, including the filter. The Karlsbad brewer became popular in Germany and Austria and was considered a premium brewing method for coffee connoisseurs. The genuine porcelain filter, which has fine slits rather than holes, allows coffee oils and fine particles through while catching the coarser grounds. The porcelain material also provides excellent thermal stability. The Karlsbad brewer is still manufactured today by companies like Walküre Porzellan and remains a niche but respected brewing method among traditionalists and porcelain enthusiasts.

Developed in Karlsbad (Karlovy Vary) in the early 19th century. Modern versions by Walküre Porzellan and other German porcelain manufacturers.

The Karlsbad brewer consists of three porcelain parts: a cylindrical upper section with a built-in porcelain filter (fine slits in the porcelain), a middle section that holds the brewed coffee, and a lid. Ground coffee is placed in the upper section, and hot water is poured over it. The water passes through the coffee bed and the porcelain filter slits, which allow oils and fine particles through while catching coarse grounds. The brewed coffee collects in the middle section. The lid keeps the heat in during brewing. The result is a rich, full-bodied cup with coffee oils and minimal sediment.

The Karlsbad brewer uses percolation through a porcelain filter. The fine slits in the porcelain filter are wider than paper filter pores, allowing more coffee oils and fine particles through. This gives the cup more body, texture, and oiliness than paper-filtered methods. The porcelain material has high thermal mass, which absorbs heat from the initial pour and radiates it back, keeping the brew temperature stable. The porcelain filter does not impart any flavor (unlike paper, which can add a papery taste). The extraction is similar to other pour over methods, but the lack of paper filtration produces a different flavor profile with more body and oils.

Ideal water has a TDS of 75 to 150 ppm, general hardness of 50 to 90 ppm, and alkalinity of 30 to 50 ppm. The porcelain filter and full-oil extraction work well with moderate hardness. Water temperature should be 92 to 96 degrees Celsius.

Water flows through the coffee bed and the porcelain filter slits by gravity. The flow rate is moderate, determined by the grind size and the filter slit width.

Typical Extraction Yield: 19 to 22%.

Typical Strength (TDS): 1.3 to 1.5% TDS.

• •Grinding too fine, which can clog the porcelain filter and slow the drawdown
• •Not pre-heating the porcelain, which causes significant temperature loss (porcelain has high thermal mass)
• •Pouring too fast, which can flood the filter and cause overflow
• •Not cleaning the porcelain filter slits properly, which causes clogging over time
• •Using too much coffee, which creates too much resistance for the filter

• •Pre-heat the entire brewer with hot water before brewing; porcelain absorbs a lot of heat
• •Use a medium-coarse grind to prevent clogging the porcelain filter
• •Pour slowly and gently, as the porcelain filter can overflow if poured too fast
• •The porcelain filter allows oils through, giving the cup body; do not use a paper filter
• •Clean the porcelain filter slits thoroughly after each use to prevent clogging
• •Use a dark roast for traditional German coffee flavor (often served with sugar and cream)
• •The porcelain material keeps the brew temperature very stable once pre-heated

• •Using different porcelain brewers (Walküre vs. other manufacturers) for slightly different filter designs
• •Adjusting grind size to fine-tune the flow rate through the porcelain filter
• •Pre-heating the brewer to different temperatures for temperature profiling
• •Using the Karlsbad brewer for larger batches (it works well for 4 to 6 cups)

• •The Karlsbad brewer is just a porcelain French press. In reality, it uses percolation (water flows through the coffee and filter), not immersion. The porcelain filter produces a different cup than the metal mesh filter of a French press.
• •You need a paper filter. The Karlsbad brewer uses a genuine porcelain filter and does not need any paper or metal filter. The porcelain filter is built into the brewer.

Disassemble the brewer. Discard the spent grounds from the upper section. Rinse all parts with warm water. Clean the porcelain filter by backflushing (pouring water from below) to remove trapped particles. A soft brush can be used to clean the filter slits. The porcelain is dishwasher safe but should be handled carefully to avoid chipping.

The porcelain is durable but can chip or crack if dropped. Check the filter slits for clogging and clean thoroughly after each use. The porcelain glaze may show coffee staining over time; this can be removed with a gentle porcelain cleanser or baking soda paste. Store carefully to prevent breakage.

• •Chapter 1: Brewing Methods
• •Chapter 2: Coffee Origins

• •Walküre Porzellan
• •Specialty Coffee Association
• •German Coffee Culture