How to Make Better Drip Machine Coffee
The machine is rarely the problem. Six changes, none of which cost anything, will get more out of the one already on your counter than replacing it would.
At a glance
- Coffee : water
- 1:16
- Active time
- 3 min
- Total time
- 9 min
- Makes
- 4 cups
- Serve
- Hot, decanted
- Kit
- Drip coffee machine
Ingredients
Note: Machine carafe markings are usually in five-ounce "cups", which is not a cup of coffee by any other measure. Ignore them and weigh the water once to learn where your fill line really is.
Method
-
Weigh the coffee
Sixty grams for a full carafe, at 1:16. A scoop is supposed to be ten grams and is routinely seven, which is how a machine ends up making weak coffee that people then blame on the machine.
Weigh it once and mark your scoop level if you would rather not weigh every morning.
-
Check the grind
Medium, like coarse sand. If the basket overflows, go coarser. If the coffee is sour and the brew finishes unusually fast, go finer.
Supermarket pre-ground is usually ground for the average machine, which is fine, but it will be weeks old.
-
Spread the bed flat
Shake the basket so the coffee sits level. Most machines dribble water onto one spot, and a sloped bed means half the coffee gets soaked and half gets rinsed.
A flat-bottomed basket is more forgiving than a cone for this reason.
-
Bloom it if you can
If your machine has a pre-infusion setting, turn it on. If not, start the machine, let it run about four seconds, then switch it off for thirty and back on.
That is a manual bloom, and on fresh coffee it makes a real difference.
Bloom 30 seconds -
Decant and kill the hot plate
As soon as it finishes, pour the coffee into a thermos or a preheated jug and switch the machine off.
A hot plate holds coffee at around 80°C, which keeps cooking it. Twenty minutes on the plate is the difference between good coffee and the stewed smell of an office kitchen.
-
Descale every month or two
Run a descaling solution through, or a 1:1 white vinegar and water mix followed by two clear water cycles.
Scale coats the heating element and the first thing it costs you is brew temperature. A machine that has gone quietly cold is the most common reason coffee turns sour with no other change.
Why this works
A drip machine is a pour over that pours for you, and that is both its convenience and its limitation. It cannot adjust its pour, so everything you control happens before you press the button.
Dose is where most of the loss is. Ground coffee is mostly air, and a scoop of it varies enormously with grind size and settling, which is why the same scoop can hold seven grams or eleven. A 1:16 brew needs 60 grams for a full carafe and most households are using closer to 40. That is not a weak machine, it is a weak recipe.
Temperature is where the rest of it goes. The Specialty Coffee Association certifies machines that hold the brew water between about 92 and 96°C, and plenty of cheap machines never get there, especially once scale has built up on the element. Under-temperature water under-extracts, and under-extracted coffee tastes sour and thin no matter how much of it you use.
The hot plate is the last insult. Coffee held at 80°C continues to change: the volatile aromatics evaporate and the remaining compounds oxidise, which is exactly the stale, flat, burnt-smelling coffee everyone recognises. A thermos costs twenty pounds and solves it permanently.
Variations
- Stronger: 1:15, or 65 g for a full carafe.
- Iced: brew at 1:12 straight onto ice in the carafe.
- Small batch: most machines brew badly below half capacity, because the shower head cannot wet a shallow bed evenly. Use a pour over for one cup.
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Questions
How much coffee per cup in a drip machine?
About 10 g per 160 g of water, which is 1:16. A full twelve-cup carafe holds roughly 960 g of water and wants 60 g of coffee. Carafe "cups" are five ounces, not mugs.
Why is my drip coffee always weak?
Almost always the dose. Weigh it once and you will probably find you have been using two thirds of what you need. Check the brew temperature next by descaling.
Is vinegar safe for descaling?
It works and it is cheap. Use a 1:1 mix with water, run a full cycle, then run two cycles of clean water or the next pot will taste of it. Commercial descaler rinses out more easily.
Do paper filters matter?
A little. Unbleached papers can add a faint taste if unrinsed. The bigger issue is using the right shape for your basket, because a filter that folds over lets water bypass the coffee.
Should I leave coffee on the hot plate?
No. It keeps extracting and oxidising. Decant into a thermos immediately and the coffee stays good for an hour or more instead of twenty minutes.