There’s a lot of talk about reducing the wash temperature to 30 degrees but there are some things you should know before jumping on this particular bandwagon. This is the claim made by a leading washing machine detergent manufacturer -
Save “on average, an astounding 41% on energy consumption”
Using 41% less electricity by washing at 30° sounds impressive, but as always with percentage figures, you need some perspective to be able to judge how significant they are. For example, 2p is 100% more than 1p, but 1 pence is hardly astounding. High percentage figures aren’t necessarily as significant as they can imply.
In the small print of the Ariel wash at 30 degrees promotion there is the qualifier I’m looking for -
“At 30°C, the average energy consumed per wash was 0.284 KWh, while at people’s normal wash temperatures, this was 0.482 KWh”
This means the saving in electricity by washing at 30 degrees was on average 0.198 KWh. The current cost of electricity varies quite a lot depending on your current tariff, but the electricity cost calculator on the UK Power site (at time of writing) is shown at 10 pence per KWh (10p for using 1000 watts usage in an hour).
This means if you save 0.198 KWh you will have saved roughly 2 pence. The average energy costs used in the test for normal washing is 0.482 KWh which is just under half a KWh (5 pence) Therefore the 41% saving is only on this 5 pence, which works out at about 2 pence. (all figures are approximate and some people may be paying more per KWh, but even at 15p the savings would still only about 3p)
It all adds up
Fair enough, any saving is good, and small savings add up. I’m just pointing out that the savings headline of 41% is slightly misleading, and dropping to 30 degree wash temperatures from 40 degrees is not going to save a fortune. However, if enough people do it, then the accumulated savings nationwide are more impressive and it would do another small bit for the environment…
Is your washing machine able to wash effectively at 30 degrees?
Before trying 30 degree washes you need to check your washing machine. Some washing machines have pre-set programmes and many are not designed for 30° washing. Most washing machines will have a 30 degree wash programme but it’s not suitable for washing cottons. This is because these programmes were designed before 30° wash detergents when only delicate laundry needed such a cool wash. As such, the wash action is too gentle, and the spin is too slow for cottons.
Washing machines are becoming available that do have a proper 30 degrees wash programme but most people do not yet have them. If you are going to buy a new washing machine and you want to wash many items at 30 degrees you need to check that is capable of washing normally at this low temperature and doesn’t just have a 30 degree wash for delicates.
Check the instruction book on your current washing machine to see if a proper 30 degree wash programme is available. Check what types of laundry it is designed for and what spin speed the final spin is before deciding it is suitable for general 30 degree washes. Of course it may still be suitable for washing delicate items at 30 degrees.
Manual temperature override option?
If your washing machine has a manual override option for temperatures then you should be able to select a normal cottons wash and reduce the temperature by hand to 30 degrees. This should result in a wash action appropriate for cottons with a proper fast spin at the end.
Finally, 30 degree washes have their limitations: Guide to washing at 30°C
- You need to wash laundry that’s stained as soon as possible. If you let the stain dry out it may not be removed with only a 30 degree wash
- You still need to wash coloureds and whites separately
- If laundry is heavily stained you will need to wash it at the normal temperature, especially those with dried-on, strongly-coloured food, thick grease, heavy mud and grass stains. Otherwise you could waste energy by having to wash them again
- If anyone in the house has been ill you should wash their laundry at the normal temperature i.e the maximum temperature allowed on the wash care label
- Washing a small load at 30 degrees is more wasteful than washing a full load at 40 degrees. In other words, if there are only a handful of items that can be effectively washed at 30 degrees and you can’t save them up until you have a full load then you might as well just mix them in with a normal load at 40 degrees
- Conversely, if you have a large load that can be washed at 30 don’t overload it. Overloading reduces the wash efficiency at the best of times and this effect is worse at 30 degrees. You could end up having to rewash things again
- Don’t be tempted to try and save money by reducing the amount of detergent used as this can result in long term build up of slime, grease and bacteria. Again, this is already a problem for people washing mostly at 40 degrees and will be worse at 30 (see last point below for more details) Extra Important: If you use mostly liquid detergent, detergent “friendly to coloureds”, or wash mostly at 40 degrees or less, you should do regular maintenance washes at high temperatures. Otherwise over time, your washing machine may accumulate bacteria, mould and greasy smelly gunge inside which will shorten its life. Full details in my Washerhelp article – Washing machine smells – causes of grease, slime and black mould inside washing machines
The list above uses some of the information available at Washing at 30 degrees (Unilever) which I found during my research.
Which is the best detergent for washing at 30 degrees?
Which? Best Buy latest tests suggest
- Ariel Excel Gel
- Persil Small and Mighty Bio
- Persil Small and Mighty Non Bio
Source Laundry detergent – Best buys & Reviews (research all consumer related issues: 1 month trial offer available at Which? – What do I get when I take a trial? )
What is added to washing powders (presumably all) to enable washing at 30? My husband (always had some eczema) now is covered with it and I have developed some for the first time in my life. I also know of some others who have recently experienced this – admittedly all in the “elderly” grouping. Would any new additive have caused this?
We have the same problem with the 30 degree washing stuff. its needed expensive prescriptions from the doctor and we spend a lot more on cream etc than we save on washing. My two sons, aged 20 and 17 are the worst affected. It nearly cost one of them his career. It is getting better now I have started to use different detergent. The trouble is, soap is the best, but the machine doesn’t like it!
I think they put in a special catalyst that enables the enzymes and bleaches to be activated at a lower temperature, where as old detergents used to be activated at 40*c for the enzymes, they add more accelerators to enable the detergent to work at even lower temperatures.
Stick to using Non Bio Detergent, Persil Non Bio being really good for sensitive skin, and use less than what they recommend, most detergent companies recommend using way too much, to enable you to buy more.
You only need to see a soft sudsy liquid when washing, its not neccessary to see loads of foam spinning around in the machine.
I use about a heaped tablespoon of Persil Non Bio per full load of washing, and also had some bicarbonate of soda for extra power if i need it. My clothes are rarely stained, but just smell bad, and you can substitute less detergent with bicarb as that softens the water, removes odours and gives the detergent an extra kick.
Less Dirt + Less Detergent = Better clear Rinsing
Also if you use white distilled vinegar as a softener instead, it will help remove any soap residue in the clothes which causes skin irritation.
I believe advice to wash at 30 degrees is a con trick.
It may be the big businesses in washing powders feel they have to be seen to be “green”, and give out silly advice, which all everyday experience knows to be rubbish.
This is too low a temperature to get clothes clean, and as the above wisely points out, does not really save any money- maybe a few pence, and you get dull dirty clothes.
Very lightly soiled small items may wash reasonably at 30, but forget it for whites and everyday clothes.
Go back to 60 and 90!
But if you like dirty clothes use 30…..