Compare indoor laundry running costs
Heated airer or dehumidifier: compare cost per dry load
A heated airer with a low wattage can still cost more per load than you expect if it runs for most of the day. A dehumidifier has a different job and its electricity use also depends on how long it runs. Compare the energy used to finish a similar load, rather than treating the number on either label as a complete drying bill.
This guide gives you a small household comparison you can repeat with equipment you already own or with documented retailer specifications. The worked figures are invented arithmetic examples, clearly separated from product performance. They do not predict a particular machine’s cost or promise that one drying method will always be cheaper.
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By Tailored Deals · Published · Editorial approach. No first-hand product testing is claimed.
Define what counts as a finished load
Choose a normal wash you can repeat, such as your usual mixed clothing load. Keep a short description of the items and use the same permitted spin setting. Check garment care labels and the equipment instructions. A load containing towels is a different comparison from one containing thin shirts, even when both fill the same basket.
Set a practical finish point: clothes are ready for their intended storage or use, with seams and waistbands checked. Record any finishing time on another appliance as part of the same method. Stopping the timer while garments are still damp makes the first method look artificially cheap. Do not manufacture a test that leaves wet laundry unattended for longer than the instructions permit.
Calculate energy without confusing watts and kilowatt-hours
For a device drawing a constant power, divide watts by 1,000 and multiply by hours. Multiply that result by your electricity unit rate in pounds per kWh. A fictional 250 W appliance running for eight hours uses 2 kWh. At an illustrative 25p per kWh, that is 50p. Neither figure is a quotation for your tariff or a claim about a model.
An appliance that cycles on and off will not necessarily draw its label wattage throughout. If you have a suitable energy monitor, use it only within its rating and the appliance manufacturer’s instructions. Otherwise record your calculation as an estimate. Keep daily standing charges out of this marginal comparison because running a drying appliance does not itself create an additional daily standing charge.
Record the room as well as the appliance
Energy Saving Trust’s damp guidance explains why moisture and ventilation matter when drying indoors. Follow the airer or dehumidifier instructions for positioning, spacing and operation. A heated rack does not remove the water from the room just because the clothes feel warmer. A dehumidifier comparison must account for the actual room conditions and any stated operating limits.
Write down where the load was dried, whether the room was occupied, and any material change in ventilation or heating. Do not assign all of a room’s heating bill to the laundry without evidence, but do not call the method free if you turned on extra heat specifically for it. Persistent damp, leaks or mould require attention to their cause, rather than a shopping decision alone.
Choose from repeatable results, not a single impressive number
Use more than one comparable load before drawing a conclusion. If a method misses the morning deadline or blocks your only walkway, note that alongside energy cost. Include the purchase price only when you are actually considering buying equipment; a useful appliance you already own has a different decision from a new purchase.
Compare an ordinary rack, a heated airer and a dehumidifier-assisted arrangement only where each is suitable for your home. You may find a routine change solves the problem without another appliance. Keep this record separate from the airer-size guide: this comparison is about the cost of completing laundry, while that guide helps you check whether the equipment fits your room.
Comparison to keep
| Method | Energy for the load | At an example 25p/kWh | What is still unknown |
|---|---|---|---|
| 250 W for 8 hours | 2.00 kWh | 50p | Actual drying performance |
| 300 W for 5 hours | 1.50 kWh | 37.5p | Cycling and room conditions |
| Your measured session | Record meter difference | kWh × your unit rate | Repeat with a similar load |