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Coffee machine power consumption: watts and kWh explained

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In short

Most bean-to-cup and espresso machines are rated between about 1100 and 1900 W, but they only draw full power while heating, often for a minute or two at a time. Energy per drink is small, usually a few hundredths of a kWh. What adds up is keeping a machine hot for long periods, especially boiler machines left on all morning. Use auto-off and eco settings, and multiply kWh by your tariff to see your own cost.

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Coffee machines have high wattage ratings, which can make them look like energy hogs. In reality, the heater runs in short bursts, and most modern machines switch to standby automatically. The bigger factor is how long you keep the machine hot. This guide explains the difference between watts and kWh, how different machine types use energy, and how to estimate your own running cost without relying on anyone else's tariff figures.

Watts vs kWh

Watts measure power: how fast a machine uses energy at a given moment. Kilowatt hours (kWh) measure energy: power multiplied by time. A 1500 W heater running for one hour uses 1.5 kWh. Running for one minute, it uses 1.5 divided by 60, which is 0.025 kWh. Your electricity bill charges per kWh, so time matters as much as wattage.

A coffee machine's rated wattage is its maximum draw when heating. Grinders, pumps and displays use far less. Once the water is hot, the heater cycles on and off to maintain temperature.

Rated power of popular machines

MachineTypeRated power
De'Longhi Magnifica StartBean-to-cup1450 W
Philips 5400 LatteGoBean-to-cup1500 W
Siemens EQ700Bean-to-cup1500 W
Sage Barista ExpressEspresso with grinder1850 W
Sage Barista ProEspresso with grinder1680 W
Breville Barista MaxEspresso with grinder1100 W
De'Longhi Dedica StyleManual espresso1300 W
Sage Smart Grinder ProGrinder165 W
Rated wattage from listings

How different machines use energy

Thermoblock and thermocoil machines, used in most bean-to-cup machines and many Sage and De'Longhi espresso machines, heat water as it passes through. They warm up quickly and use energy mainly while brewing. Single boiler machines like the Gaggia Classic heat a small boiler and keep it hot. Dual boiler and heat exchanger machines hold larger volumes of hot water and use more energy to stay ready, especially if left on for hours. Our boilers explainer covers the designs.

Rinse cycles at switch-on and switch-off, milk frothing and cup warmers add a little extra. Grinders use very little energy because they run for seconds.

  • brewsteamone boiler, one job at a time

    Single boiler

    Warm-up: about 10 to 20 min

  • brewsteambrew water runs through a hot boiler

    Heat exchanger

    Warm-up: about 15 to 25 min

  • brewsteamone boiler for each job

    Dual boiler

    Warm-up: about 15 to 30 min

  • brew or steamheats water as it flows

    Thermoblock or thermojet

    Warm-up: under 1 min

  • Brew water path
  • Steam path

Warm-up times are typical values; the maker's figure for your machine may differ.

Four ways to heat water: the system decides how long you wait and whether you can brew and steam at once.

Work out your own running cost

This gives a reasonable estimate. A plug-in energy monitor gives an exact reading if you want one. For the cost of coffee and milk per cup, use our cost per cup calculator.

  1. 1

    Find your machine's rated wattage on the label or listing, for example 1500 W.

  2. 2

    Estimate how many minutes the heater runs per day, including warm-up. For a thermoblock machine making three drinks, a few minutes in total is typical.

  3. 3

    Convert to kWh: watts x minutes / 60,000. For 1500 W x 5 minutes, that is 0.125 kWh.

  4. 4

    Multiply by your electricity tariff per kWh, shown on your bill.

  5. 5

    Add standby: if your machine lists standby watts, multiply by hours in standby.

Standby and eco modes

Most machines sold in the UK switch to a low-power standby after a set time, as required by EU-derived ecodesign rules that still shape the market. Many bean-to-cup machines let you set auto-off from a few minutes to several hours. Shorter is better for energy, though the machine will rinse again when you switch it back on.

Some machines, such as the Gaggia Classic E24 variant, include an energy-saving mode that turns off the boiler after inactivity. Our Classic Evo Pro vs E24 article explains it.

Tips to use less energy

  • Set auto-off to the shortest time that suits your routine.
  • Switch boiler machines off when you finish rather than leaving them on all morning.
  • Descale regularly; scale on heaters slows heat transfer. See our hard water guide.
  • Turn off cup warmers if you preheat cups with hot water.
  • Choose a thermoblock machine if fast heat-up and low standby matter most.

Compare bean-to-cup machines →

Frequently asked questions

Do coffee machines use a lot of electricity? Not usually. The heater draws high power but for short periods. Leaving a boiler machine on for hours uses the most.

Is a coffee machine under 1000 W better? Lower wattage means slower heating, not necessarily less energy per cup. Total heating time matters more.

Should I leave my bean-to-cup on all day? No need. They heat quickly, so auto-off saves energy without much waiting.

How much power does a coffee grinder use? Grinders are typically rated well under 300 W and run for seconds, so their energy use per cup is tiny.

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