The Efficient Sticker Is Only Half the Story: 31 Days of Meter Readings on Three 'A-Rated' Appliances
Photo: Stonesynergyimages, CC BY-SA 4.0, via Wikimedia Commons
Energy labels are brilliant at one thing: helping you compare new appliances on a test bench. They are less brilliant at telling you what a machine will cost in your kitchen, with your habits, at your tariff. So we did the boring bit. We put three mid-priced 'A-rated' appliances on plug-in energy monitors for 31 days, ran them as normal, and compared the meter readings with the kWh figures on the sticker.
What we tested, and how
All three were bought new in October 2026: a 70/30 fridge-freezer at £529, a 9kg washing machine at £449 and a 13-place dishwasher at £399. Each carried an A rating on the post-2021 A–G scale. We used a plug-in energy monitor for the washing machine and dishwasher, and a smart plug with energy logging for the fridge-freezer. The tariff was the 24.6p per kWh on our October 2026 standard variable bill, with standing charges excluded because they apply whatever you buy.
We annualised the month's readings, then compared them with the label's annual kWh figure. For the washer and dishwasher, we converted the label's per-100-cycle figure using our actual cycle counts. That matters: a label figure is not a forecast of your year. It is a standardised estimate based on a specific programme, load and temperature.
The meter readings versus the label
| Appliance | Label says | Our month | Annualised | Annual cost at 24.6p |
|---|---|---|---|---|
| Fridge-freezer | 143 kWh/year | 14.9 kWh | 175 kWh | £43.15 |
| Washing machine | 52 kWh/100 cycles | 13.4 kWh over 22 cycles | 61 kWh/100 cycles (about 153 kWh/year at 250 cycles) | £37.60 |
| Dishwasher | 85 kWh/100 cycles | 21.6 kWh over 24 cycles | 90 kWh/100 cycles (about 198 kWh/year at 220 cycles) | £48.70 |
None of the three was wildly off. The fridge came in about 22% above its label figure, the washing machine about 17% above, and the dishwasher roughly 6% above. That is not a scandal. It is normal life: a warm kitchen, a half-loaded dishwasher, a quick wash instead of the eco cycle, and a fridge door that gets opened every time someone fancies a snack.
The interesting bit was not the overrun. It was how little that overrun changed the payback maths.
The payback maths at 24.6p
We compared each A-rated model with the next-best B-rated equivalent we could find at the same retailer. The price gaps were £90 for the fridge-freezer, £60 for the washing machine and £50 for the dishwasher.
Using the label figures, the annual electricity savings looked like this: about £6.64 for the fridge, £4.31 for the washer and £4.87 for the dishwasher. That gives payback periods of roughly 13.6 years, 13.9 years and 10.3 years respectively. Using our real readings instead of the label barely moved the needle, because the gap between A and B is small in cash terms at current tariffs.
That is the bit the showroom sticker does not spell out. An A rating is a relative score, not a promise of free money. If the efficient model costs £60 more and saves £4 a year, you need to keep it for 15 years to break even on energy alone. Most people do not keep a washing machine that long.
Where the label quietly misleads
First, the label is based on a specific cycle. The washing machine figure assumes eco 40–60 and a particular load. We ran a mix of 30-degree quick washes and 40-degree cottons, which is what most households actually do. The dishwasher label assumes the eco programme; we used intensive more often because baked-on pasta cheese does not care about your energy goals.
Second, the fridge label assumes a set ambient temperature. Our kitchen was warmer than a test lab in the afternoon sun, and the fridge had to work harder. That is not the manufacturer cheating. It is the difference between a laboratory and a home.
Third, the A rating is not comparable across appliance types. A large American-style fridge-freezer can be A-rated and still use more electricity than a smaller B-rated model. The label tells you how efficient it is for its size and type, not how much it will add to your bill in absolute terms.
Fourth, the per-cycle figures can flatter a machine if you run more cycles than the label assumes. A household doing 300 washes a year will feel the difference more than one doing 180. The label gives you a rate, not your annual total.
The five-year rule we now use
We are not saying ignore the label. We are saying do one extra sum before you pay the premium. Find the price difference between the A-rated model and the next-best B-rated one. Find the annual kWh difference on the labels. Multiply that kWh difference by your tariff. Divide the price premium by the annual saving.
If the payback is under five years, buy the efficient model. If it is five to eight years, buy it only if you expect to keep the appliance that long and you value the warranty, noise level or build quality. If it is over eight years, take the cheaper model unless the efficient one is better in other ways. For most mid-priced appliances at 24.6p per kWh, the energy saving alone will not justify a large premium.
The exception is replacing an old appliance. If your current fridge is a 15-year-old G-rated monster, almost any modern A or B model will cut running costs noticeably. That is a new-to-old comparison, not a new-to-new one, and it usually pays back much faster.
The bottom line
The A label is a useful tiebreaker, not a savings guarantee. In our month of meter readings, the efficient models were not con artists. They were just not the money-printing machines the sticker implied. Spend the extra for quietness, size, build quality or a longer warranty if those things matter to you. Do not spend it simply because the label whispers that it will pay for itself. At current UK tariffs, it probably will not — at least not before the appliance is ready for the tip.
