Reference guide · Updated on 2026-08-09 · Café en Casa Team

Drip and office coffee machines: volume without complications

Q: What is the difference between espresso, lungo and ristretto?

It is the same dose of coffee with a different amount of water. A ristretto is around 18 g for 25 ml and comes out dense and sweet; a double espresso, 18 g for 36 ml; a lungo goes past 60 ml and drags in more bitterness because it keeps extracting when there is nothing good left. If you want a long, mild coffee, go for an americano instead: espresso with hot water added.

Q: How long does a coffee machine take to heat up?

With a thermoblock, 30-40 seconds; with a boiler, between 5 and 15 minutes until the temperature is genuinely stable. The machine says it is ready long before it is: run a shot through the group head and give it another minute if you want the first cup to come out like the rest.

Q: How often do you need to descale?

It depends on water hardness: with hard water (above 25 °fH, usual on the Mediterranean coast and in central Spain) every 1-2 months; with soft water, every 3-4. Using filtered or weakly mineralised water multiplies the machine's service life.

Q: Why is my espresso watery and sour?

Almost always because the extraction is too fast: if it runs through in under 20 seconds, grind finer or increase the dose. Also check that the coffee is freshly roasted and that you are purging the group head before extracting.

Q: What budget do I need for a drip coffee maker?

It depends on your use: there are valid options in the entry range and advanced models that only pay off if you are going to make the most of their features. Go through the criteria in this guide, define your real use and compare the current price on Amazon before deciding.

When a drip coffee maker is the best option, what capacity you need and how to avoid stewed jug coffee.

Drip and office coffee machines: volume without complications

Moka pot: why it is not an espresso

The moka pot works at 1,5-2 bars, a long way from the 9 of an espresso, so it does not produce real crema: it makes a concentrated coffee, with body and roasted notes. To get it right: medium grind (coarser than for espresso), fill the filter without tamping, put already-hot water in the boiler so the coffee does not stew on the way up, and take it off the heat as soon as it starts to gurgle. Never wash it with detergent or in the dishwasher if it is aluminium: just water, then dry it. It costs 20-35 € and is still the best pleasure-per-euro in home coffee.

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Pressurised vs non-pressurised portafilter

It is the most important difference in the 80-300 € range and almost nobody explains it. The pressurised (double-bottomed, with a valve that creates the back-pressure artificially) forgives a bad grind and produces crema even with supermarket coffee: ideal if you are not going to buy a grinder. The non-pressurised (mesh bottom, barista type) depends on you grinding, tamping and dosing well, but it is the only one that gets you to a specialty espresso. If you buy a machine with a pressurised basket expecting to make third-wave coffee, you are going to get frustrated.

Bean-to-cup: what justifies the jump in price

Between a 300 € bean-to-cup machine and a 800 € one there are four real differences: the grinder (number of steps and whether it is steel or ceramic), the temperature and ratio control per drink, the milk circuit (removable and washable versus fixed) and the ease of maintenance (removable brew group or not). What does not justify the jump: big screens, the number of pre-programmed recipes and app connectivity, which almost nobody uses after the first month. If you make one or two milk drinks a day, the sweet spot is between 400 and 600 €.

The 9 bars of pressure that really matter

Almost every entry-level machine advertises 15 or 20 bar, and it is a marketing figure: that number is the maximum pressure of the vibration pump, not what reaches the coffee. A correct espresso is extracted at 9 bars at the group head, and above 11-12 the extraction turns bitter because it drags out compounds that should stay behind. A 15 bar machine with a properly calibrated OPV valve makes better coffee than an unregulated 20 bar one. When comparing, ignore the bar figure and look at whether the portafilter is pressurised or not, and at temperature stability.

Water hardness and descaling: what kills coffee machines

The number one cause of breakdowns is limescale, not use. Across much of the Mediterranean coast and central Spain the water exceeds 25-30 °fH, and at that hardness a machine without a filter needs descaling every 1-2 months; with soft water (<15 °fH) you can stretch it to 3-4 months. Use filtered water or bottled water with weak mineralisation (dry residue below 100 mg/l), set the hardness in the menu if the machine allows it, and do not ignore the descaling warning: once the heating element scales up, the water no longer reaches temperature and the coffee tastes thin long before the machine actually fails.

Mistakes that ruin coffee (and it is not the machine)

Five mistakes explain most bad coffee at home: using months-old ground coffee kept in the opened bag; very hard water or tap water with chlorine; do not warming the cup, which drops the temperature of the drink by 8 to 10 °C at a stroke; not purging the group head before extracting; and tamping with uneven pressure, which creates channels where the water escapes without extracting. None of them cost money to fix. Before changing machine, correct these five: in most cases the problem was never the appliance.

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Frequently asked questions about drip coffee makers

What is the difference between espresso, lungo and ristretto?

It is the same dose of coffee with a different amount of water. A ristretto is around 18 g for 25 ml and comes out dense and sweet; a double espresso, 18 g for 36 ml; a lungo goes past 60 ml and drags in more bitterness because it keeps extracting when there is nothing good left. If you want a long, mild coffee, go for an americano instead: espresso with hot water added.

How long does a coffee machine take to heat up?

With a thermoblock, 30-40 seconds; with a boiler, between 5 and 15 minutes until the temperature is genuinely stable. The machine says it is ready long before it is: run a shot through the group head and give it another minute if you want the first cup to come out like the rest.

How often do you need to descale?

It depends on water hardness: with hard water (above 25 °fH, usual on the Mediterranean coast and in central Spain) every 1-2 months; with soft water, every 3-4. Using filtered or weakly mineralised water multiplies the machine's service life.

Why is my espresso watery and sour?

Almost always because the extraction is too fast: if it runs through in under 20 seconds, grind finer or increase the dose. Also check that the coffee is freshly roasted and that you are purging the group head before extracting.

What budget do I need for a drip coffee maker?

It depends on your use: there are valid options in the entry range and advanced models that only pay off if you are going to make the most of their features. Go through the criteria in this guide, define your real use and compare the current price on Amazon before deciding.

Other guides from Mejor Café en Casa

Espresso machines Bean-to-cup machines Capsule machines Moka pot, AeroPress, V60 and Chemex Coffee grinders Whole beans Coffee machine maintenance

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