Quick answer
A kettle is normally a small per-use cost, but it is one of the easiest household habits to tighten up. Boiling exactly what you need is often the real saving opportunity, not swapping between similar kettle models.
Running cost guide
Kettle running cost
Kettles draw a lot of power, which is why they look expensive on paper, but they usually run for a short time. The bigger waste is boiling more water than you need, then doing it repeatedly through the day.
Last reviewed: 16 April 2026 - UK-focused estimate guide
A kettle may be rated at 2kW or more, but it only runs for minutes. Short run time matters just as much as power draw.
Boiling a full kettle for one drink is the classic example of a small habit creating a repeated avoidable cost.
Tea-heavy households, home workers and larger families can still rack up a meaningful annual cost through repetition.
What usually changes the answer
These are the practical details that usually change the answer more than a manufacturer headline or a one-line forum estimate.
- Water volume matters more than appliance branding because more water takes more energy to heat.
- Repeated reboiling can quietly increase the annual total.
- Hard water and limescale can affect performance over time, though usage habits usually matter more than maintenance for cost.
- If the kettle is old but working, replacement savings are usually modest compared with simply boiling less water.
Related pages
Use these next if your question has moved from a simple cost or saving estimate into a bigger household decision.
General appliance running cost calculator
Test your own kettle wattage and actual boil pattern directly.
Electric shower running cost
Another example where high wattage looks dramatic but usage length decides the real bill impact.
LED lighting savings
Useful if you are trying to spot everyday low-friction bill reductions around the home.
Methodology
See why per-use appliance estimates need time and usage assumptions, not wattage alone.
Is a kettle expensive to run?
Usually not per use. The real issue is how often it is boiled and whether you overfill it every time.
Does a higher-watt kettle cost more?
Not automatically in a meaningful way. A more powerful kettle may boil faster, so the real determinant is the energy used to heat the water, not just the peak power.
What is the cheapest way to use a kettle?
Boil only what you need, descale it if needed, and avoid repeated full boils for one or two drinks.