Tumble dryer vs drying clothes outside: how much do you save?

Drying clothes outside or on an indoor rack instead of using a tumble dryer saves £50 a year in Great Britain and £60 a year in Northern Ireland, according to the Energy Saving Trust¹. That figure assumes the usual laundry is dried outside for just three months of the year, so it is a conservative estimate rather than a best case¹. The same organisation repeats the £50 and £60 figures in its general quick-tips guidance and in its advice for renters².

The saving is small in cash terms because it is measured against a modest amount of tumble drying. The cost of the machine itself is where the money goes. An average tumble dryer uses about 3 kWh per cycle, which at the July 2026 price cap unit rate works out at 78p every time it runs⁴. National Energy Action puts a vented or condenser cycle higher, at £1.21 to £1.56⁵. Run three loads a week and the annual bill reaches the £125 to £147 range that independent testing has recorded for condenser and vented machines⁶.

What air drying offers a UK household

The case for air drying rests on a simple substitution: the laundry still gets dry, but the heat comes from the sun, the wind or the ambient air in the house rather than from a resistive element drawing 1.8 to 5 kWh an hour⁸. The Energy Saving Trust's £50 and £60 figures are the most widely quoted version of that saving, and they appear in guidance aimed at owner-occupiers, renters and anyone working through a list of low-cost measures¹.

Other bodies put the number slightly higher. SP Energy Networks, the distribution network operator, gives around £55 from line drying instead of tumble drying when the weather allows¹¹. Its separate home-energy page gives £30 from line drying instead of using a tumble dryer, a lower figure that reflects a different assumed pattern of use¹². Scope, the disability equality charity, gives £60 a year from drying clothes on racks or outside where possible¹³. The Consumer Council for Northern Ireland gives around £60 from avoiding the tumble dryer in warmer weather¹⁴.

The spread from £30 to £60 is not a disagreement about physics. It reflects how many loads a household is assumed to move outdoors, and for how much of the year. The Energy Saving Trust is explicit that its £50 and £60 figures assume outdoor drying for three months only¹. A household that line-dries for six months, or that has the outdoor space and the weather to do so, sits above that range; one that air-dries a handful of loads a month sits below it.

What air drying offers for energy independence is real but partial. It removes a load from the electricity supply entirely, and it does so without any purchase, installation or subscription. It does not remove the household from the grid, and it does not work in every home: flats without balconies, terraces with small yards and households in damp or cold weather have less scope than the guidance assumes. Indoor drying also puts moisture into the air, which has to be managed through ventilation.

What the specifications show

Tumble dryers are labelled on a different scale from most white goods. In Great Britain they use A+++ down to D, not the A to G scale that applies to ovens, fridges and washing machines⁹. The 2021 rescale to A to G applied only to certain appliances and did not include tumble dryers, which kept the older A+++ to D grades¹⁰. In Northern Ireland, new labels use a rescaled A to G rating that removes the old A+++, A++ and A+ grades¹⁰.

That difference matters when comparing a machine bought in one part of the UK with one bought in another. A dryer sold in Northern Ireland with an A rating is not directly comparable with a dryer sold in Great Britain with an A+++ rating, because the scales are different constructions¹⁰. The higher standards in Northern Ireland also mean some older tumble dryers can no longer be sold there because they are considered too energy inefficient¹⁰.

Which? has tested 135 tumble dryers and awarded 34 Best Buys and 3 Don't Buys, with the highest score recorded at 82%¹⁵. That testing programme is the main independent source of performance data on individual models sold in the UK.

The recommended cycle setting is auto-dry rather than a timed cycle, which lets the machine stop when the load reaches the chosen dryness rather than running for a fixed period¹⁸. Running the dryer on a lower heat setting is also reported to save energy compared with a high-heat setting⁵.

What the warranty covers

Guarantee terms are set by the maker, not by regulation, and they vary widely across the brands sold in the UK. Hoover tumble dryers carry a one-year guarantee as standard, and the appliance must be registered with Hoover¹⁵. Samsung tumble dryers carry a two-year guarantee as standard, with some products eligible for guarantees up to five years; all products must be registered on purchase to qualify¹⁹. AEG tumble dryers carry a two-year guarantee as standard, with selected models on a five-year guarantee²⁰. All IKEA tumble dryers come with a five-year guarantee as standard¹⁶.

The pattern is that the standard term is short, one to two years for most brands, and the longer terms are either model-specific or conditional on registration. A five-year guarantee on a machine expected to run for a decade or more leaves the household carrying the repair risk for most of the appliance's life. That is a dependence on the manufacturer's service network and on the availability of spare parts, and it is worth reading alongside the running-cost figures, because a cheap machine with a high running cost can cost more over its life than a dearer one with a lower one⁷.

What it costs to run

The running cost of a tumble dryer depends on three things: the energy the machine uses per cycle, the number of cycles, and the unit price of electricity. On energy use, the range across the sources is wide. Smart Energy GB gives 1.8 to 5 kWh an hour on average, based on a power rating multiplied by one hour of use at the £0.2635 per kWh energy price cap⁸. Uswitch gives an average of 3 kWh, which at the July 2026 price cap works out at 78p per cycle⁴. National Energy Action puts a vented or condenser cycle at £1.21 to £1.56⁵.

Annual figures follow from those per-cycle numbers. Condenser tumble dryers are reported to cost over £125 a year on average, and American-style fridge freezers sit in the same bracket⁶. A condenser model is reported at about £138 a year based on three full loads a week on cotton and cupboard dry settings at the July energy price cap of 26.11p per kWh⁷. An earlier independent press release gives £147 a year for vented dryers and £140 for condenser machines²¹. The Energy Saving Trust frames the same spending as waste: relying exclusively on a tumble dryer for all clothes drying wastes £50 a year in Great Britain and £60 in Northern Ireland²².

The comparison that changes the arithmetic is between dryer types rather than between drying and not drying. A heat pump tumble dryer rated A+++ is reported to add around £54 a year to energy bills, against about £138 for a condenser model⁷. The Energy Saving Trust puts the lifetime saving of an A+++ machine over a B-rated one at around £700 in Great Britain and £850 in Northern Ireland over a 13-year life⁹. A separate Energy Saving Trust figure gives £700 over an 11-year lifetime for the same comparison, so the two documents differ on the assumed life even where they agree on the direction⁵.

Prices for the machines themselves are installer- or retailer-quoted and vary by model, capacity and retailer, so no single figure covers the market. The payback question is therefore about running cost, not purchase price: the gap between a heat pump machine and a condenser machine is roughly £84 a year on the figures above, and the gap between drying outside and using a condenser machine is roughly £138 a year⁷.

The rules are changing

The government consulted on raising product standards for household tumble dryers, opening the consultation at midday on 17 July 2025 and closing it at 11:59pm on 14 August 2025²³. The response, published on 19 March 2026, set out final policy decisions to proceed with new Ecodesign and Energy Labelling regulations for household tumble dryers in Great Britain²³.

The new rules set a maximum Energy Efficiency Index of 85 and a minimum 80% condensation efficiency rate¹⁷. Vented tumble dryers are reported to use far too much energy to be remotely close to meeting the new requirements, so a ban on the sale of inefficient condenser and vented tumble dryers in the UK is expected as soon as time allows¹⁷. New models will also have to carry an eco-programme, effective moisture collection and little to no power use in standby mode⁷. The consultation also covers reforming the energy efficiency and condensation efficiency scales and introducing a new acoustic airborne noise emission and repairability index scale²³.

Two limits on the scope are worth noting. The new minimum energy performance standards apply only to standalone tumble dryers, not to washer-dryers¹⁷. And the rules are being made for Great Britain; Northern Ireland already operates a rescaled A to G label and has already removed some inefficient models from sale¹⁰.

What it means for energy independence

A tumble dryer is one of the household appliances with the smallest potential for demand flexibility, grouped by the Citizens Advice policy briefing with refrigerators, freezers, extraction fans and heat recovery ventilation as appliances with larger comfort impacts if their use is shifted²⁴. That matters for independence because it means the load cannot easily be moved to a cheaper or greener time of day. A household that wants to run a dryer on its own solar generation has to run it when the sun is out, which is not when most laundry gets done.

Air drying is the opposite: it uses no metered energy at all, needs no supplier, no app and no cloud connection, and cannot be interrupted by a power cut. That is the strongest form of independence available for this particular task, and it is why the £50 to £60 saving understates the case for households that can do it. The limit is practical rather than financial. Outdoor drying depends on weather and outdoor space; indoor drying depends on ventilation, and official guidance on traditional buildings notes that while draught-stripping is valuable for energy efficiency it reduces the free air within the building, and the practitioner has to demonstrate how the proposals manage this²⁵. Airtightness and indoor drying pull against each other.

Where a dryer is used, the remaining dependence is on the electricity supply, on the unit price at the time of use, and on the manufacturer for parts and service once the guarantee has expired. Room-sealed appliances or those with a directly connected ducted external air supply minimise ventilation energy losses from the room and the risk of cold draughts, which is the installation detail that keeps a vented dryer from undoing other fabric work²⁶. For a household working through a plan, the sequence that matters is set out in the full guide to getting started, and the appliance-level savings sit alongside the measures covered in no-cost and low-cost ways to cut energy use and how much can changing habits save on energy bills.