Extraction rates quoted by all dehumidifier manufacturers can be misleading - as they generally refer to water extraction in conditions not found in the UK. Not only that, it has been the trend to build bigger and more powerful domestic dehumidifiers when they are not necessary.
In the past, dehumidifiers were imported from the USA and Asia – where climate conditions are more humid with higher temperatures. When these dehumidifiers found their way to
the UK, the same standard measurement of extraction capacity was used – despite it being irrelevant to the UK.
Litres of water extracted per 24 hours became the way to classify dehumidifier performance. Extraction capacity is determined by three factors: