Appliance Energy Guide
Not all household appliances are equal when it comes to electricity cost. Some draw a lot of power but run briefly; others draw very little power but run continuously; a few do both. This guide gives a realistic overview of where electricity actually goes in a typical European home, to help you prioritise which appliances are worth measuring and optimising first.
The two dimensions that matter: power and duration
An appliance's contribution to your bill depends on power (watts) multiplied by how long it runs, not on wattage alone. This is why a kettle, despite being one of the highest-wattage devices in most kitchens, often contributes relatively little to a bill — it runs for minutes, not hours — while a refrigerator, despite a modest wattage, can be one of the largest contributors simply because it never stops running.
Always-on appliances
Refrigerators and freezers are the classic always-on load: relatively low average wattage, but running 24 hours a day, 365 days a year. Routers, smart home hubs and standby power on various electronics also fall into this category individually small, collectively meaningful. See our refrigerator running cost calculator to estimate this specifically.
High-wattage, short-duration appliances
Kettles, toasters, hair dryers and microwaves draw significant power but for only minutes at a time. Their contribution to a monthly bill is usually smaller than their wattage rating might suggest, precisely because runtime is so short.
High-wattage, moderate-duration appliances
Electric heaters, tumble dryers, washing machines on a hot cycle, ovens, and air conditioners typically combine meaningful wattage with runs measured in tens of minutes to a few hours. These tend to be the appliances most worth measuring individually, since small changes in habit — a lower wash temperature, a shorter heating session — can produce a noticeable saving. Our dedicated calculators for heaters, washing machines, tumble dryers and air conditioners cover this category.
Growing loads: EV charging and home electronics
Electric vehicle charging is becoming one of the largest single loads in homes that have adopted it, often exceeding every other appliance combined on a night the car is charged from a low battery. Because EV charging happens in large, controllable blocks of time, it is also one of the easiest loads to shift to cheaper off-peak tariff windows where available. See our EV charging cost calculator for a dedicated estimate.
Building your own appliance priority list
A practical approach is to estimate the top five or six appliances by rough monthly kWh — typically the fridge, any heating or cooling appliance, the washer and dryer, and any EV charging — since these usually account for the majority of a household's controllable electricity cost. Smaller, short-duration appliances rarely justify the same attention, even though they are often the ones people worry about first.
Frequently asked questions
Which single appliance uses the most electricity in a typical home?
It varies by household, but heating appliances (electric heaters, or heating elements in dryers and ovens) and EV charging, where present, are typically among the largest individual contributors, alongside the cumulative effect of an always-on refrigerator.
Should I worry about phone chargers left plugged in?
Modern chargers draw very little power when not actively charging a device, so this is usually a minor factor compared with heating, cooling, laundry and always-on appliances.
Is it worth buying a plug-in power meter?
For appliances where you are uncertain of real wattage — especially older or unlabelled devices — a plug-in power meter can give a far more accurate figure than a guess, and typically costs very little.
Do standby modes use meaningful electricity?
Individually, standby draw is usually small, but across many devices in a home it can add up over a year, which is why fully switching off rarely used electronics is a reasonable low-effort habit.
How do I estimate a whole month's electricity cost from individual appliances?
Run this site's relevant calculator for each significant appliance using your own wattage, usage pattern and tariff, then add the results together for a realistic composite estimate.
