The belief that washing laundry at higher temperatures is more effective has changed. Thanks to innovations in washing machine and detergent technology, most fabrics can now be thoroughly cleaned at lower, consistent temperatures—typically starting at minimum 15°C (59°F).
Modern washing machines are specifically designed for low-temperature operations, featuring advanced drum designs and refined tumble sequences that effectively agitate clothes. This ensures that dirt and stains are lifted without the need for high heat.
Additionally, contemporary laundry detergents have significantly advanced. They include a blend of cleaning agents, such as surfactants and enzymes.
Surfactants effectively capture dirt and oil from fabrics, pulling them into the wash water. Research shows that short surfactant molecules are more effective in cold water, leading many brands to formulate their products accordingly.
Anti-redeposition agents complement surfactants by suspending stains in the wash water, preventing them from settling back onto other garments during the cycle.
Since dirt particles tend to be less soluble at lower temperatures, modern formulations often include additional anti-redeposition ingredients. Many of these new detergents also feature enzymes derived from bacteria found in colder regions, such as Iceland, which clean clothes most effectively at around 15°C to 20°C (59°F to 68°F).
The advantages of washing at lower temperatures are notable. Hot water typically accounts for about 90% of the energy consumption of a washing machine, so switching to cooler washes can lead to significant savings on your electricity bills.
Moreover, washing in hot water can lead to fabric abrasion, meaning cooler temperatures can extend the life of your clothing while also reducing microplastic release.
Nevertheless, there are exceptions. Items that require disinfection, such as cloth diapers or medical scrubs, are still best washed in boiling water.
This article addresses the question, “What is the best temperature to wash laundry?” as posed by Theo Hayes from Leeds.
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