How to Use a Cold Brew Coffee Maker | Smooth Concentrate in 5 Steps

Cold brew tastes smoother than hot-brewed coffee because steeping coarse grounds in cold water for hours extracts fewer bitter compounds. Getting the method right matters more than the machine, and the basics stay the same whether you own a full-size OXO, the compact version, or a KitchenAid unit. Measure the coffee, pour the water evenly, wait patiently, then drain and dilute. Here is the sequence that works.

What You Need Before You Start

Use coarsely ground coffee. Fine grounds turn the brew bitter and clog the filter, slowing the drain or stopping it completely. OXO’s manual specifies a conical burr grinder setting of 11-15 for its brewers, which lands between medium-coarse and coarse. A blade grinder works too, but pulse it in short bursts so the grounds stay uniform rather than turning to dust.

Measure both the coffee and the water before you begin. The ratios below come straight from each maker’s manual, and they differ enough that guessing will throw off the strength.

Use filtered water if your tap tastes strongly of chlorine or minerals. Cold or room-temperature water both work; the brew relies on time, not heat.

Step-by-Step: Add, Pour, Steep, Drain

Put the coarse grounds into the brew basket or container. For the OXO Compact, align the vertical markings on the brewing container before assembling, or the pieces will leak when you pour.

Pour the water over the grounds in a slow circular motion so every particle gets wet evenly. KitchenAid’s manual says to pour its 34 oz of cold water this way, and OXO gives the same instruction for its full-size brewer. Uneven pouring leaves dry pockets of coffee that never extract, which wastes grounds and weakens the batch.

Steep at room temperature for 12-24 hours. The OXO Compact can also brew in the fridge for 20-24 hours if you prefer a colder start. Longer steeping pulls more caffeine and flavor, so aim for the higher end when you want a stronger concentrate.

Drain the brewer once steeping finishes. The full-size OXO uses a built-in drain switch; the Compact drains automatically when you lift the brew basket. KitchenAid’s design varies slightly, so follow the model-specific guide to avoid spilling. Do not open the drain early unless the design allows it, because the grounds will still be releasing flavor and you will end up with weak, cloudy coffee.

Dilution, Storage, and the Mistakes to Skip

What drains out is concentrate, not drinking coffee. Dilute it with water or milk at a 1:1 ratio to start, then adjust to taste. Some people prefer 1:2 for a lighter cup over ice.

Store the concentrate in the refrigerator. OXO says the full-size brewer’s concentrate keeps up to two weeks; the Compact’s manual says its batch stores for up to 14 days. The concentrate stays smoother than regular coffee when chilled, so it holds up well for a week of cold cups.

Common mistakes to skip:

• Overfilling the brew basket makes the coffee extract unevenly and slows the drain.
• Using fine grounds clogs the filter and changes the brewer’s performance, per OXO’s manual.
• Rushing the steep. Anything under 12 hours comes out weak and sour.
• Skipping the dilution step and drinking the concentrate straight, which is harsh even for devoted caffeine fans.

Room-temperature brewing and fridge storage are what these manuals specify, so keep the batch out of direct sunlight while it steeps. When you are ready to upgrade or replace your current brewer, our tested roundup of the best cold brew coffee makers compares the models worth buying this year.

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