Washer Dryer Running Costs: Are 2-in-1 Machines Efficient?

Key takeaways

• Washer dryers are usually similar in running cost to an efficient washing machine for the wash phase, but the drying phase can use as much, or more, electricity than a separate condenser dryer.
• Real‑world cost per full wash‑and‑dry cycle often falls in the range of a few dozen pence to over one pound, depending on energy rating, drum size, how full you load it and which programme you choose.
• Condensing washer dryers tend to be cheaper to buy but more expensive to run than newer heat pump designs; the Comfee 10kg/7kg washer dryer is an example of a more efficient A‑rated option.
• Using eco modes, washing at lower temperatures, partial drying and sensible load sizes can cut your annual running costs significantly without making laundry a chore.
• Expected lifespan and repair costs matter: a mid‑range washer dryer that lasts many years and is used efficiently can work out cheaper overall than running two older, inefficient appliances.

Why washer dryer efficiency matters

Washer dryers are often bought for convenience and space‑saving, especially in flats and smaller homes where fitting two full‑size appliances is difficult. However, the convenience of pressing a single button to handle both washing and drying can hide the true amount of energy and water being used in the background. Over time, these running costs can easily overtake the cost of the appliance itself.

Electricity is the biggest factor. Heating water for the wash and heating air for the dry cycle both require a lot of energy, and most UK homes use electricity rather than gas for laundry appliances. If you run several loads each week, the difference between an efficient A‑rated washer dryer and an older or less efficient model can add up to a noticeable sum across the appliance’s life.

Water use also matters, particularly for washer dryers that use water to help with the condensing stage during drying. While a separate vented dryer uses air to remove moisture, many washer dryers rely on cold water to cool the hot air inside the drum, which can significantly increase your water consumption per load compared with washing alone.

Finally, efficiency has a comfort and practicality angle. Less efficient machines tend to run hotter, for longer, and can leave clothes over‑dried or creased, meaning more ironing and more wear on fabrics. An efficient machine, well used, should balance running costs, fabric care and convenience.

How efficient are washer dryers versus separate machines?

To understand whether washer dryers are efficient, it helps to split things into two parts: the wash phase and the dry phase. For washing only, a modern washer dryer usually performs similarly to an equivalently specified washing machine. Energy use per wash is mostly driven by drum size, spin speed and wash temperature, so a 10 kg combo appliance is in the same range as a 10 kg washing machine with similar features.

The bigger differences appear during drying. Compared with a separate tumble dryer, washer dryers typically hold less laundry for drying than for washing, and they tend to dry more slowly. Many use condensing technology, which is convenient because it needs no external vent but is less efficient than some stand‑alone dryers and can consume quite a bit of water in the condensing process.

Newer heat pump washer dryers narrow this gap by using lower temperatures and a heat‑exchange system to reuse warm air. This can reduce energy use for drying significantly compared with a traditional condenser design, although these models often cost more up‑front and can have longer programme times. A separate high‑end heat pump dryer can still beat most integrated combos for pure drying efficiency, but the difference is shrinking.

In practice, whether a washer dryer is “efficient” for you depends on how you use it. If you often wash a full load but only dry part of it, make use of eco modes and avoid very hot cycles, you might spend less overall than running an older washer plus a basic condenser dryer. If you constantly run maximum‑temperature wash‑and‑dry cycles back‑to‑back, your bills will inevitably be higher, no matter which appliance you own.

Energy ratings and kWh: what the labels actually mean

Energy labels are meant to give you a quick comparison between models, but understanding what they mean in practice is more useful than simply choosing the nearest A on the shelf. The label for a washer dryer usually shows separate figures for a ‘wash only’ cycle and a ‘wash and dry’ cycle, with estimated energy consumption in kilowatt hours (kWh) and water use in litres.

For many mid‑range washer dryers, a typical cotton wash at 40°C might use somewhere around 0.7–1.2 kWh of electricity, depending on drum size and efficiency, while a full wash‑and‑dry cycle for the same load might use around 3–5 kWh. A more efficient model, such as the Comfee 10kg/7kg machine with an A energy rating, is designed to sit at the lower end of these ranges, especially on eco programmes.

On the other hand, many popular models still carry D ratings for the combined wash‑and‑dry cycle. Examples include larger‑capacity options such as the Hisense 10 kg washer dryer or more compact designs like the Hisense 8 kg/5 kg Wi‑Fi model. These are still perfectly usable appliances, but they will generally consume more electricity per complete cycle than the most efficient A‑rated rival.

Remember that labels are based on standardised test cycles, which might not match how you actually do laundry. If you regularly wash at 30°C, avoid intensive dry cycles and rarely fill the drum to the brim, your real‑world energy use could be lower than the label suggests. Conversely, frequent hot washes or overloading can push actual consumption above the test‑bench figures.

Typical running costs: worked UK‑style examples

To make all this more concrete, it helps to translate kWh figures into pounds. The principle is straightforward: multiply the energy the machine uses in kWh by your electricity tariff in pence per kWh. For water, you can do the same with your combined supply and wastewater charges if you know them.

Imagine a washer dryer that uses 1 kWh for a 40°C cotton wash. If your electricity tariff is 30 pence per kWh, that wash costs about 30 pence in electricity. If the same appliance uses 3.5 kWh for a full wash‑and‑dry cycle on cottons, then that complete cycle costs about £1.05 in electricity at the same tariff.

For water, a typical wash might use 40–60 litres, while a full wash‑and‑dry on some condensing models can use 80 litres or more once the condensing water for drying is included. If your combined water and sewerage cost is, for example, around 0.3 pence per litre (equivalent to about £3 per 1,000 litres), then 60 litres of water adds around 18 pence to the cost of the cycle.

Putting this together, a realistic example for a full cotton wash‑and‑dry might look like this: around £1.05 in electricity plus around 20 pence in water, giving roughly £1.25 per complete load. An efficient A‑rated heat pump combo running an eco programme might come in noticeably under this, while a large, less efficient condenser design on intensive cycles could cost more.

Condensing versus heat pump washer dryers

Most washer dryers on the market use condenser technology. In these appliances, hot moist air from the drum is cooled, often with the help of cold water, causing the moisture to condense and be pumped away. This is simple and reliable, and it means there is no need for a vent hose, but it is not the most energy‑efficient way to dry clothes and it usually uses more water than washing alone.

Heat pump washer dryers work differently. They use a sealed heat‑exchange system that recycles hot air, drying clothes at lower temperatures while using less electricity. Because the heat energy is reused, energy consumption for the drying stage is typically much lower, even if the programme runs for longer. Heat pump systems also tend to be gentler on fabrics because they avoid very high drying temperatures.

The trade‑off is initial price and complexity. Heat pump combos typically cost more to buy than basic condenser models, and their technology is a little more complex, which might influence repair costs. However, for households that do a lot of tumble drying, particularly in smaller homes where hanging clothes indoors is difficult, the reduction in running costs over the life of the appliance can outweigh this.

If you are comparing models like a straightforward condenser design against a more efficient alternative, look at the energy used per full wash‑and‑dry cycle on the label and factor this into your calculation of total cost of ownership, not just the purchase price.

How load size, temperature and eco modes affect costs

Even with the same appliance, your habits will strongly influence running costs. Overloading a washer dryer forces the motor and heating elements to work harder, clothes may not rinse properly, and drying times increase. Under‑loading isn’t ideal either, because you are using almost the same energy and water to wash far fewer items.

Eco programmes are designed to strike a more efficient balance. They typically wash at lower temperatures for longer, using less energy to heat water. If you are used to 60°C cycles, switching to a well‑designed 30°C or 40°C eco wash can reduce energy use noticeably without sacrificing cleanliness for everyday laundry. Many stains are more about detergent and time than pure heat.

The same is true of drying. If your washer dryer allows you to select dryness levels or timed drying, you do not always need the strongest “cupboard dry” setting. Stopping slightly short and air‑drying the last bit on a rack can cut energy use and be kinder to your clothes. In some households, it works well to use the dryer mainly in cooler, damper weather and line‑dry whenever conditions are suitable.

Smart features can also help. Wi‑Fi enabled models such as the Hisense 3S Series 8 kg/5 kg washer dryer often include downloadable eco programmes or usage insights through an app, helping you identify which cycles use the least energy and schedule them at times when tariffs are lower, if your electricity provider offers time‑of‑use rates.

A simple rule of thumb: wash full, dry partial. Fill the drum sensibly for washing, then only tumble‑dry what genuinely needs it. This alone can trim a surprising amount off your annual laundry costs.

Are washer dryers expensive to run?

Washer dryers have a reputation for being expensive to run, largely because people compare the cost of a full wash‑and‑dry cycle with the cost of washing alone. When you add heating water for washing to heating air for drying in one continuous programme, the total energy use naturally looks high.

However, if you compare like for like – one appliance doing both tasks versus a separate washing machine and tumble dryer – the picture is more nuanced. A good washer dryer, used sensibly, is not inherently more expensive than running a decent‑quality washing machine plus a typical condenser dryer. The combined energy use might even be a little lower, thanks to a single spin stage and a more compact design.

The perception of high cost often comes from inefficient usage rather than the appliance itself. Repeated very hot washes, unnecessarily long drying cycles, half‑empty drums and constant use of intensive options all push up consumption. By contrast, cooler eco washes, moderate drying, partial loads for drying and line‑drying when possible can make a washer dryer relatively economical.

In short, washer dryers are not automatically expensive to run, but they do concentrate your laundry energy use into a single machine, making it easier to notice. Viewing cost per load in context, and adjusting your laundry routine a little, usually gives a fairer picture.

How to estimate your annual running cost

Estimating annual running cost for your washer dryer is easier than it looks. You need three pieces of information: the energy used per cycle (from the label or manual), the number of cycles you run each week, and your electricity tariff. If you want to be more precise, you can also add water consumption and water charges.

Start by noting the kWh figure for a typical wash, and for a combined wash‑and‑dry, from your appliance documentation. Suppose your regular wash‑only cycle uses 0.9 kWh and your regular wash‑and‑dry uses 3 kWh. If you do three wash‑only loads and two wash‑and‑dry loads per week, that is (3 × 0.9) + (2 × 3) = 8.7 kWh per week.

Multiply this by your electricity tariff. At 30 pence per kWh, that works out at about £2.61 per week. Multiply by 52 for a rough annual total: around £135 in electricity for laundry. If you want to include water, use the litres‑per‑cycle figure and your price per litre in the same way. Even a simple rough estimate like this is enough to compare one appliance with another or to see the effect of cutting down on tumble drying.

If you are in the market for a new appliance, you can run exactly the same calculation for a model you are considering, such as an A‑rated combo or a D‑rated large‑capacity machine, and compare the estimated annual costs before deciding which to buy.

How long do washer dryers last, and why it matters for cost

Running cost is only part of the picture. Lifespan and repair costs matter just as much when you are trying to keep long‑term expenses under control. Washer dryers do a lot of work in a single cabinet, and the combined mechanical and thermal load means they can be slightly more complex than a stand‑alone washing machine.

With normal household use and basic care, many modern washer dryers comfortably last for a good number of years. Key factors that influence lifespan include build quality, how heavily they are used, and whether lint filters, detergent drawers and seals are cleaned regularly. Overloading, slamming doors, ignoring vibration or noise, and never running maintenance cycles can shorten an appliance’s useful life.

Spending a little more on a robust machine with a good motor warranty can be sensible if you do a lot of laundry. Inverter or brushless DC motors, like those promoted in some newer models, are generally efficient and can be quieter and more durable than older designs. From a cost perspective, a slightly higher purchase price spread over an extra few years of service often works out cheaper than buying the very lowest‑cost appliance and replacing it earlier.

When comparing against separate machines, also consider that you have only one appliance to service and eventually replace, rather than two. Even if an individual repair for a combo costs a little more, the total number of call‑outs and replacement purchases over time may still be lower.

Think in terms of “cost per year of service”, not just the price tag. An efficient washer dryer that lasts longer and is used wisely can be more economical overall than two cheaper, less efficient appliances replaced more often.

Practical ways to reduce washer dryer running costs

There are several simple habits that can make a noticeable difference to what you pay without adding hassle to laundry day. First, run full but not overstuffed loads. Aim for the drum to be roughly three‑quarters full, with enough space for clothes to move freely. This makes the most of each wash and reduces the number of cycles you need.

Second, wash at lower temperatures where appropriate. Everyday lightly soiled clothes usually come out perfectly clean at 30°C or 40°C with a decent detergent. Save hotter cycles for bed linen, towels and heavily soiled items. Third, make good use of spin speed: a faster spin removes more water, reducing drying time. Just check labels for delicate fabrics that prefer lower spin speeds.

For the drying phase, consider whether everything really needs to go through a full tumble‑dry. Heavy items like jeans and towels benefit most from drying help, while lighter items like shirts and synthetic sportswear often air‑dry quickly. If you only dry what needs drying, and stop the cycle once clothes are dry enough, you cut energy use and help fabrics last longer.

Finally, keep the machine in good condition. Clean lint filters, run occasional drum‑clean cycles, and wipe the door seal to prevent mould. A well‑maintained washer dryer runs more efficiently and is less likely to suffer costly faults, which indirectly keeps your cost per wash down.