The most energy-efficient washing machine under £400 is the Hisense WF3S9043BB3, which uses just 34 kWh per 100 cycles — the lowest running cost in the budget band at 8.4p per wash.
The energy label tells you A, B or C. It does not tell you the difference between a machine that costs £22 a year to run and one that costs £34. Both can carry an A rating. The number that actually matters is kWh per 100 cycles — and that is what we ranked these machines on.
Every machine below was scored using our WAC Score, built from 430,000+ verified customer reviews, energy data and spec analysis across nearly 500 washing machines. We show you all four scoring dimensions: reliability, efficiency, features and value. Honestly, including where a machine falls short.
Running cost formula: kWh per 100 cycles × 24.67p ÷ 100 = cost per wash. At 5 loads per week, multiply by 260 for the annual figure. All machines in this guide are A-rated under the current UK energy labelling system introduced in 2021.
At a glance — top 5 budget machines ranked by kWh
| Machine | kWh / 100 cycles | Cost / wash | Water / cycle | WAC Score | Price |
|---|---|---|---|---|---|
| Hisense WF3S9043BB3 | 34 | 8.4p | 39L | 89 | £289 |
| Hoover HBR411BL9G | 37 | 9.1p | 48L | 87 | £329 |
| Haier HW90-BP14357TUUK | 39 | 9.6p | 42L | 85 | £349 |
| Indesit IMA762 | 39 | 9.6p | 43L | 81 | £219 |
| Candy GD298 | 40 | 9.9p | 42L | 88 | £249 |
The gap between position 1 and position 5 here is 1.5p per wash. At 5 loads a week over 10 years that is £39 in electricity — less than the price difference between some of these machines. Within a band this tight, the overall WAC Score and water consumption become the meaningful tiebreakers.
Our top picks in detail
Hisense WF3S9043BB3
9kg · 1400rpm · A rated · Black
No freestanding washing machine under £400 in our database uses less electricity per cycle than the Hisense WF3S9043BB3. At 34 kWh per 100 cycles it costs 8.4p per wash — roughly £22 a year at 5 loads a week. It also leads on water consumption at just 39 litres per cycle, the lowest of this five. The inverter motor contributes to both the efficiency figures and the long-term reliability case. On the data available to us, this is the strongest all-round budget efficiency pick — high WAC Score, lowest running cost, lowest water use. The honest caveat: features score of 72 means it is not the most programme-rich machine in this list. If a wide range of wash programmes matters to you, machine 3 (Haier) is the better fit.
Hoover H-WASH 350 HBR411BL9G
11kg · 1400rpm · A rated · Graphite
An 11kg drum at £329 is genuinely unusual — most machines at this capacity cost significantly more. The efficiency argument here is not just about the kWh figure: a larger drum means fewer cycles per week for a busy household, which reduces total annual energy consumption further than the per-cycle number alone suggests. Wi-Fi connectivity via the hOn app allows remote start and cycle monitoring. The honest negative: features score of 59 is the lowest in this guide, which means a limited programme selection beyond the basics. Water consumption at 48 litres per cycle is also the highest of the five — a relevant consideration if water costs matter to you.
Haier X Series 5 HW90-BP14357TUUK
9kg · 1400rpm · A rated · White
The Haier X Series 5 has the highest features score of any machine in this guide at 72 — matching the Hisense at position 1 but at a higher price point. Wi-Fi connectivity, a solid reliability score of 78 and competitive water consumption at 42 litres per cycle make it a well-rounded choice. At 39 kWh per 100 cycles it matches the Indesit on running cost. The honest caveat: at £349 it is the most expensive machine in this guide and the value score of 48 reflects that — you are paying a modest premium for the Haier brand and feature set. If budget is tight, machine 1 delivers better value per pound. If features matter, this is the one to pick.
Indesit My Time IMA 762
7kg · 1200rpm · A rated · White
At £219 the Indesit IMA762 is the most affordable machine in this guide by a significant margin. For a single person or couple with straightforward laundry needs, it does the job — A-rated efficiency, 39 kWh per 100 cycles matching the Haier at position 3, and a solid Indesit reliability score. The honest negatives are real and worth understanding: 1200rpm spin leaves clothes noticeably wetter than 1400rpm alternatives, which means longer drying time. The 7kg drum is a constraint for anyone washing bedding or larger loads. Features score of 51 reflects a basic programme selection. This machine earns its place in this guide purely on price and efficiency — if your needs are simple and your budget is firm, it is a respectable choice. If you can stretch to £289, machine 1 is a meaningfully better machine.
Candy Quick Pro GD 298-80
9kg · 1200rpm · A rated · White
The Candy GD298 has the highest value score of any machine in this guide at 83 — meaning it delivers strong performance relative to its £249 price point. A 9kg drum at this price is excellent, and the WAC Score of 88 is second only to machine 1. The efficiency score of 88 and 40 kWh per 100 cycles makes it genuinely competitive on running costs. The two honest negatives: 1200rpm spin is the same limitation as the Indesit — clothes come out wetter, drying takes longer. Features score of 59 means a limited programme set. If you want 9kg capacity at the lowest possible price with decent efficiency credentials, the Candy earns its place. If spin speed matters, spend the extra £40 for machine 1 and get 1400rpm.
Frequently asked questions
What is the most energy-efficient washing machine under £400?
Based on our database of nearly 500 machines, the Hisense WF3S9043BB3 uses the least electricity of any freestanding washing machine under £400 — 34 kWh per 100 cycles, costing 8.4p per wash at the April 2026 Ofgem rate. It also uses the least water per cycle at 39 litres.
Does A-rated always mean low running costs?
No — and this is the most important thing to understand before buying. Every machine in this guide carries an A energy rating, yet the running cost ranges from 8.4p to 9.9p per wash. Both the Hisense and the Candy are A-rated, but the Hisense uses 34 kWh per 100 cycles versus the Candy's 40 kWh. Always check the kWh per 100 cycles figure in the product specifications, not just the letter on the label.
Does drum size affect running costs?
Directly, larger drums use slightly more energy and water per cycle. But for a household that generates large volumes of laundry, a bigger drum means fewer cycles per week — which can reduce total annual energy consumption. The Hoover at position 2 uses 37 kWh per cycle with an 11kg drum. A household doing 4 loads a week rather than 6 because of the larger drum will spend less on electricity overall, despite the higher per-cycle figure.
Is 1200rpm a problem on an efficient machine?
It depends on how you dry. A 1200rpm spin leaves clothes wetter than 1400rpm, which means longer tumble dryer time or longer line drying. If you use a tumble dryer regularly, the energy cost of extra drying time can easily exceed the washing machine's efficiency advantage. Both 1200rpm machines in this guide, the Indesit and the Candy, are honest choices for light users, but 1400rpm is the better default for most households.
How much does water consumption matter?
At current UK water rates, the difference between 39 litres and 48 litres per cycle is approximately £3–£5 per year for an average household. It is a secondary consideration relative to electricity cost, but worth knowing if you are on a water meter. The Hisense at position 1 uses the least water of any machine in this guide.
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