Tumble Dryer Timing on Octopus Agile: Save Over £100 a Year

The tumble dryer timing saving: full numbers

The maths here is stark. A standard condenser tumble dryer uses 2.5kWh per cycle. That is not an estimate. It is the measured average from UK consumer testing, consistent across brands from Hotpoint to Bosch.

Multiply that 2.5kWh by the price you pay:

• Peak Agile (38p/kWh): 95p per cycle
• Price cap (26.11p/kWh): 65p per cycle
• Economy 7 overnight (11p/kWh): 28p per cycle
• Agile overnight (4p/kWh): 10p per cycle
• Agile plunge pricing (0p/kWh): 0p per cycle

Now scale that to real usage. The average UK household runs the tumble dryer 4-5 times a week, roughly 250 cycles per year.

At peak Agile prices all year: 250 x 95p = £237

At overnight Agile all year: 250 x 10p = £25

The difference: £212. Even if you only shift half your loads to overnight timing, you save over £100 annually. That is two months of groceries. A family holiday weekend. A new coat.

The overnight rate is not always 4p. It varies by region and by night. But across the year, the cheapest overnight windows on Octopus Agile average out well below 10p/kWh. Check tonight's rate on AgileAlert to see exactly what your region is offering right now.

How to set delay start on your tumble dryer

Most tumble dryers manufactured since 2015 include a delay start function. It works exactly like delay start on a washing machine: you load the drum, set the programme, and tell the machine when to begin.

The general approach across all brands:

1. Load the drum and select your drying programme as normal.
2. Find the delay button. It is usually labelled "Delay Start," "Timer," or shown as a clock icon.
3. Press it repeatedly (or use the +/- controls) to add hours of delay. Each press typically adds one hour.
4. Press Start to confirm. The machine locks the door and waits.

The key question is: what time should you set it for? Check AgileAlert's live price dashboard each evening. The cheapest 2-3 hour window is usually between midnight and 5am, but varies by day. Set your dryer to start at the beginning of that window.

If your washing machine finishes at 2:30am, set the dryer to start at 2:45am. The whole laundry cycle, both machines, completes before 5am. You wake up to clean, dry clothes that cost 18p total to wash and dry.

For a complete brand-by-brand guide, see How to Use Delay Start on Your Tumble Dryer: All Brands Guide.

The heat pump dryer upgrade: is it worth it?

A heat pump tumble dryer uses a refrigerant circuit to recycle warm air rather than expelling it. The result: it uses approximately 1kWh per cycle instead of 2.5kWh for a condenser dryer. A 60% reduction in energy use.

Combined with overnight timing, the numbers shift dramatically:

• Condenser dryer, overnight Agile (4p): 10p per cycle, £25/year
• Heat pump dryer, overnight Agile (4p): 4p per cycle, £10/year
• Heat pump dryer, price cap (26.11p): 26p per cycle, £65/year

The upgrade payback period depends on what you currently have. If you replace a 5-year-old condenser dryer running at peak prices with a heat pump dryer running overnight, the combined timing-plus-efficiency saving is around £200-220 per year. A mid-range heat pump dryer (around £500-600) pays back in under 3 years.

For the full comparison, read Heat Pump Tumble Dryer vs Condenser: Which Saves More?

Safety: running tumble dryer overnight

Tumble dryers feature in UK fire service statistics more often than most appliances. That is a real fact. It is also a fact that the vast majority of those fires involve one of three causes: blocked lint filters, kinked or crushed exhaust hoses on vented models, or overloaded drums forcing the motor to overheat.

None of those causes are specific to overnight running. A dryer with a blocked lint filter is dangerous at 2pm as well as 2am.

The practical guidance from UK fire services:

• Clean the lint filter before every cycle, not just occasionally.
• Never leave a vented dryer running with a blocked or kinked hose.
• Do not overload the drum. A jammed-full drum increases drying time and motor strain.
• Have a smoke alarm fitted near the appliance location.
• Heat pump and condenser dryers have a lower fire risk than vented dryers because they operate at lower temperatures internally.

Millions of UK households run their tumble dryers overnight as routine. With the filter cleaned and the drum loaded sensibly, the risk is very low. For a detailed safety checklist, see Tumble Dryer at Night: The Safety Checklist.

Stacking laundry: washing machine then dryer, both overnight

The most efficient approach is the full overnight laundry stack: washing machine first, tumble dryer second, both within the same cheap price window.

Here is how to time it:

A standard 40-degree cotton cycle takes 90-120 minutes. A standard condenser drying cycle takes 45-90 minutes depending on load size. Together: 2.5-3.5 hours total.

If your cheapest overnight window runs from 1am to 5am (four hours), set your washing machine to start at 1am. It finishes at 2:30am. Set your dryer to start at 2:45am. Both machines complete by 4:30am at the cheapest rate of the night.

Total cost for the full wash-and-dry cycle: approximately 18-20p at 4p/kWh Agile overnight rates. Compare that to doing both during evening peak: approximately £1.80-2.00. That is a 90% cost reduction for the same output.

Check AgileAlert each evening to confirm tonight's cheapest window and set both machines accordingly. The whole process takes under two minutes.

Plunge pricing and the tumble dryer: running for free or profit

Octopus Agile generates negative prices 5-10 times per month, typically on windy nights when renewable energy supply significantly exceeds grid demand. During these periods, Agile customers are paid to use electricity. The floor is -20p/kWh.

Running your tumble dryer during a negative pricing event costs you nothing. If the rate reaches -10p/kWh and your dryer uses 2.5kWh over its cycle, Octopus effectively pays you 25p for running it. That is not hypothetical. It happens regularly.

AgileAlert tracks upcoming plunge events in the Live Prices section. When one appears overnight, run everything you can: washing machine, dryer, dishwasher. Charge the EV. Heat the immersion cylinder. Every unit you consume during negative pricing is either free or earns you money back on your bill.

Most plunge events occur between 2am and 6am, which maps perfectly to the overnight delay start window. The tumble dryer is ideally positioned to capture these events automatically if you have set a delay start within the relevant hours.

Using AgileAlert to find tonight's window

The whole system depends on knowing tonight's cheapest hours before you go to bed. Octopus publishes the next day's Agile prices at approximately 4pm each afternoon. AgileAlert pulls those prices and displays them clearly by region.

Here is the two-minute evening routine:

1. Open AgileAlert on your phone. The "Next Cheap Window" stat at the top of the dashboard shows the cheapest upcoming 2-hour slot in your region.
2. Note the start time. Load your washing machine. Set delay start to that time.
3. Load your tumble dryer. Set delay start to approximately 2 hours after the washing machine start time (or slightly later to stagger them).
4. Done. Both machines run overnight at the cheapest rate. Nothing to do in the morning except move the dry clothes to the wardrobe.

Over a year, this routine saves the average household with a condenser dryer between £90 and £120 from the dryer alone. Add the washing machine saving and the total exceeds £170 from two appliances, one habit, two minutes per evening.

The price comparison table below shows what a full year of drying costs across different scenarios:

The heat pump dryer stacked saving

If you upgrade to a heat pump dryer and time it overnight on Agile, the annual cost falls to approximately £10. That is the combined effect of 60% less energy use (1kWh instead of 2.5kWh) and running at 4p instead of 38p.

The difference between worst case (condenser, peak pricing, £237/year) and best case (heat pump, overnight Agile, £10/year) is £227 per year from one appliance. That is a tank of petrol every single month. A short-haul return flight. Twelve restaurant meals.

You do not have to reach best case to save substantially. Simply shifting your existing condenser dryer from evening to overnight already cuts the annual bill from £237 to £25. That saving alone, £212 per year, covers the cost of a decent heat pump dryer within three years.

Which loads are best for overnight drying?

Not every load needs to go through the dryer. Being selective about what you tumble-dry reduces usage further and extends the life of your clothes. Some items benefit most from overnight dryer timing:

• Towels and bedding: These take longest on an airer and are high-priority items where freshness matters. Tumble-dry overnight, airer the rest.
• School uniforms and work shirts: Time-sensitive. Running these through the dryer the night before means they are dry, de-wrinkled, and ready to wear without morning stress.
• Winter wool and heavy cotton: Items that would take 24+ hours on an airer in cold weather. The dryer is the practical option.

For lightweight summer items, t-shirts, underwear, thin cotton, consider an airer instead. Read Airer vs Tumble Dryer: the genuine cost comparison to decide which loads should go where.

Common mistakes that wipe out the saving

A few habits prevent people from capturing the full overnight saving:

Running a half-empty drum. A dryer with three items in it uses nearly as much energy as a full load. Batch laundry. Run full loads. The cost per garment drops dramatically.

Using maximum heat settings habitually. Most fabrics dry well on medium heat. Maximum heat shortens drying time by only 10-15 minutes while consuming 15-20% more energy. Overnight timing makes the extra speed irrelevant.

Not cleaning the filter. A partially blocked lint filter forces the dryer to run longer to achieve the same result. A clean filter every cycle means a shorter cycle and lower total energy use. Five seconds of work, measurable cost saving.

Ignoring the condenser tank. On condenser dryers, a full water tank causes the machine to stop mid-cycle and wait. Check and empty it before setting the overnight delay. Nothing ruins the overnight system faster than waking up to a half-dry load.

The full annual saving breakdown

Let us put it all together for a household running the tumble dryer 4 times per week on Octopus Agile:

Baseline (current peak-time runner): 208 cycles at 38p/kWh = £197

After overnight timing: 208 cycles at 4p/kWh = £21

Saving from timing alone: £176 per year

After adding occasional plunge pricing events (conservatively 20 free cycles per year): saving rises to around £195.

That is close to £200 saved annually from one appliance change. No new machine needed. No smart home hub. Just a two-minute evening routine and the delay start button you already have.

See the full annual cost breakdown and savings calculator for a complete picture of how usage frequency affects your personal saving.

Frequently asked questions