Kegerator

A kegerator is a refrigerator built or converted to hold a keg and pour draft beer from it, and the difference between one and a normal fridge is pressure. The keg sits cold at 36 to 40 degrees Fahrenheit while a CO2 tank pushes beer up a line to a faucet, so every pint comes out carbonated and at serving temperature instead of going flat and warm as the keg empties. That single arrangement is why a room with a kegerator pours like a bar rather than like a cooler full of cans.

The economics are the usual reason anyone buys one. Draft beer from a keg costs up to 60 percent less than the same volume in bottles or cans, and a keg tapped under CO2 stays fresh for up to 60 days, so there is no rush to drink it flat. A full half-barrel holds 124 pints or about 165 twelve-ounce glasses, which turns a home bar into the place the group gathers. Home units run $400 to $1,500 for a single-tap freestanding model, with premium and commercial units going beyond that, and a conversion kit is the cheap path if you already have a fridge.

A kegerator is not the whole draft system, and it is not a beverage cooler. The kegerator is the refrigerated cabinet; the draft system is the whole pressurized chain from the CO2 tank to the faucet, which can even run through glycol-chilled lines to a tap in another room. It is also not a jockey box, which chills beer in ice and stays portable. Buy a kegerator for a permanent tap, not for tailgates.

What a kegerator does on every pour

The loop is mechanical and worth understanding before you buy. CO2 leaves a tank and passes through a regulator, which drops the cylinder pressure down to a serving pressure of about 10 to 14 psi. The gas travels to a coupler locked onto the keg, pushing beer out a liquid tube to the faucet. Temperature does the rest: beer stored at 36 to 40 degrees retains its carbonation and pours clean, while warmer beer pours foam, and beer freezes at about 27 degrees, with light beers freezing as high as 31. Beer line length does the final balancing: a longer 3/16 inch line resists the pressure and pours slow and smooth, while a short line lets CO2 break out of solution and foam into the glass. Two kegerators can pour differently at the same pressure simply because one has a longer line.

Sizing is where most decisions happen. A freestanding full-size unit is typically 20 to 25 inches wide, 33 to 36 inches tall, and 24 to 29 inches deep, and the tap tower adds 14 to 16 inches of height on top. A full half-barrel is 23 3/8 inches tall and 16 1/8 inches in diameter and weighs about 160 pounds full, so the interior and the floor both have to handle it. Single-tap home units weigh 90 to 120 pounds empty, and dual-tap models run 100 to 150. A 5 pound CO2 tank dispenses roughly five to six half-barrels before it runs dry. Commercial and built-in models run $1,500 to $7,000, and the premium buys more kegs, more taps, and a cabinet that vents through the front for an under-counter install.

Kegerator versus draft system versus keezer

Three near-synonyms cause most of the confusion. A kegerator is the appliance: the fridge with a keg in it. A draft system is everything that moves and pressurizes the beer, and it can extend beyond the cabinet, so a kegerator in a garage can feed a faucet at a bar across the room. A keezer is a chest freezer converted with a temperature controller, holding more kegs than an upright unit at 32 to 38 degrees, at the cost of lifting kegs over the rim.

The practical choice is between an upright kegerator and a keezer. The upright is the low-effort option, and the keezer wins on capacity and floor space. Both beat a beverage cooler for beer duty, because the cooler stores cans and bottles but has no way to pressurize a keg. When the beer duty is only occasional, a beverage cooler stays useful for the weeks between kegs, which is a real consideration in a small room.

Where the term came from

Kegerator is a portmanteau of keg and refrigerator, and it was coined for a very American gap. Refrigerated draft dispensing existed in bars and saloons from the early 1900s, but the United States made home brewing illegal in 1920 and did not legalize it again until 1978. The homebrew revival of the 1980s produced surplus corny kegs and a demand for draft at home, and the first home kegerators followed the law change. The word is relatively new: the earliest printed use found in Google Books dates to 1994, so the term, the appliance, and the legal right to use it all arrived within about fifteen years of each other. The pressure in a full CO2 tank reads about 750 to 800 psi at room temperature, which is why the regulator exists at all: without it, the tank would drive the keg's internal pressure far past what the coupler is built to handle.

Common mistakes

Temperature first. People set the kegerator to fridge cold or leave it warm, and both ruin the pour: too warm makes foam, too cold freezes light beers at 31 degrees. Hold 36 to 40 degrees and let a fresh keg settle for a few hours before the first pour.

Pressure second. Crank the regulator to 20 psi because the tap seems slow and you get a faucet that dumps foam. Serving pressure of 10 to 14 psi with balanced line length pours clean; change one variable at a time and give the system a day to stabilize.

Timing matters too. A keg tapped straight off a delivery truck, before the beer has settled at serving temperature, pours foam for the first several glasses because the CO2 has not dissolved back into the liquid; let it rest cold for a few hours before the first pint.

Neglect third. Lines that are not cleaned every two weeks grow the bacteria and yeast that make a keg taste like an old sponge, and a CO2 tank with no spare leaves a full keg unservable. Keep a spare tank and a line-cleaning kit. Finally, measure the cabinet before buying: some brands' quarter barrels bulge to 17 inches in diameter and will not fit a cabinet sized for a slim sixtel, so confirm the keg you actually drink fits the unit you buy. The pro-grade tap plumbing guide covers the installation side of all of it.