How to Use a Percolator (and Why Percolator Coffee Turns Bitter)

To use a percolator, fill the base with cold water, put coarse coffee in the basket, and heat it on medium until it starts to perk. Then turn the heat down so it perks gently, and take it off 4 to 7 minutes later. Lift out the basket and pour. Every other piece of advice about percolators is a way of avoiding the one thing they do too well: extracting coffee past the point where it tastes good.

How a percolator works

A percolator is a small pump with a coffee basket on top. The pot has a chamber at the bottom, closest to the heat, and a metal tube rising from it through the middle of the pot. A perforated basket of coffee sits on the tube, with a spreader plate on top.

As the water in the bottom chamber heats, bubbles of steam form and rise up the tube, carrying slugs of hot water with them — the same principle as a gas-lift pump. The water hits the underside of the lid, spreads over the plate, rains down through the coffee and drips back into the pot. Then it happens again. That intermittent splash is the perk you can hear and, in most stovetop models, see in the glass knob on the lid.

As the whole pot nears boiling, the separate perks run together into a continuous gurgle.

Why percolator coffee gets bitter

Most brewing methods pass water through or past the coffee once. A percolator keeps going: the liquid that drips back into the pot is already coffee, and it is pumped up and poured over the same grounds again, and again, at close to boiling point.

That has two consequences. Extraction does not stop on its own — the longer the pot perks, the more it pulls from the grounds, including the harsh, bitter compounds that come out last. And the brewing temperature is higher than most methods use. Left to perk at a boil, percolator coffee turns harsh and excessively bitter, which is how many people remember it.

It is not inevitable. Moderate heat, a coarse grind and a firm stop time make a strong, full-bodied pot that many people genuinely prefer. The bitter or sour guide explains what over-extraction tastes like and why.

How to use a stovetop percolator

For a 6-cup pot — about 900 ml of water:

1. Fill the base with cold water to the line, keeping it below the bottom of the spout.
2. Put the tube and basket in place and add 40–50 g of coarse coffee to the basket, ground like a French press grind. Fit the spreader lid over the basket, then put the pot lid on.
3. Heat on medium, not high.
4. When it starts to perk, turn the heat down until it perks gently and steadily rather than boiling hard.
5. Time it: 4 to 7 minutes from the first perk — about 4 for a lighter pot, 5 to 6 for balanced, 6 to 7 for strong.
6. Take it off the heat and lift out the basket straight away, so the grounds stop dripping into the coffee.
7. Let it stand for half a minute so any fine particles settle, then pour.

If it comes out weak, use more coffee next time rather than perking longer. If it is bitter, perk for less time, turn the heat lower once it starts, or grind coarser.

The tablespoon rule, weighed

The classic percolator guide is one tablespoon of ground coffee per cup — and on a percolator, a "cup" is usually about 5 ounces, not 8. It is worth doing the sum.

How much a tablespoon holds depends on how you fill it. CoffeeGeek puts a slightly rounded tablespoon of ground coffee at about 7 g; a level one is very roughly 5 g, though both vary with the grind. A 5-ounce cup is about 148 ml. So the traditional rule comes to somewhere between 5 ÷ 148 × 1000 ≈ 34 g and 7 ÷ 148 × 1000 ≈ 47 g of coffee per litre. Most filter coffee is brewed at 55–60 g per litre, as the coffee-to-water ratio guide explains.

That is the hidden logic of the old percolator. It uses relatively little coffee and makes up the strength by extracting it hard, through long recirculation at high temperature — which is exactly the recipe for bitterness. Turning that around gives a better pot: use more coffee, around 45–55 g per litre, and perk for less time, so the strength comes from the coffee rather than from over-extraction.

Electric percolators

An electric percolator has its heating element in the base and controls the heat for you. Most reduce the heat automatically at the end of brewing and keep the coffee hot without boiling it, which removes the two commonest stovetop mistakes.

Presto, for example, rates its 12-cup stainless steel percolator at about a cup a minute, defines a cup as about 5 ounces of brewed coffee, and uses a signal light to show when the coffee is ready. Follow your model's measuring guide for the first pot, then adjust the coffee to taste. Large electric percolators — coffee urns — are the same machine scaled up for offices and events.

Percolator, moka pot or drip?

People often mix up percolators and moka pots, especially in North America. They work quite differently:

The moka pot guide covers that brewer, and the drip coffee guide covers the machine that replaced the percolator in most American kitchens.

Filters, sediment and cafestol

A percolator's basket is perforated metal, so some fine grounds always get through, and so do the coffee oils. Among those oils is cafestol, the compound that raises LDL cholesterol. Researchers measuring it across brewing methods found the most in unfiltered coffee and negligible amounts in paper-filtered coffee.

Paper filters made for percolator baskets solve both problems at once: less sediment and most of the cafestol held back. If you drink percolator coffee every day and your cholesterol is a concern, they are worth using. The coffee and cholesterol guide explains the evidence.

A short history

A stovetop coffee pot that raised boiling water through a tube in a continuous cycle was invented in Paris in 1819 by the tinsmith Joseph-Henry-Marie Laurens. The American design most people picture was patented by Hanson Goodrich, an Illinois farmer, in 1889: a broad base, a central tube and a perforated basket hanging on it. Later patents added very little.

Electric percolators followed in the early 1900s. They dominated American kitchens until the early 1970s, when automatic drip coffee makers took over. In Italy and Spain the moka pot had already replaced the percolator by the end of the 1930s.

Keep it clean

Coffee oils build up on the tube, basket and spreader, and stale oils make fresh coffee taste stale too. Wash all three after every use, and scrub the inside of the tube with a narrow brush now and then. The equipment cleaning guide covers what to use.