We set up our dehumidifiers in a temperature- and humidity-controlled test chamber. For each model, we measure the amount of water removed during three test runs at different temperature/humidity combinations that reflect humid winter climates (between 8°C and 16°C and 65% to 90% relative humidity). For details, see our article on how we test dehumidifiers.
The heating effect from the dehumidification process (measured at 12°C and 75% relative humidity). This is generally noticeable but far short of what a typical 2000W or 2400W heater will deliver. See our buying guide for more about this.
This is the maximum amount of water, in litres, collected in our test before the machine detected "tank full" and switched off. It's usually close to the claimed tank capacity but may be a little under or over that claim.
This column shows which products have been discontinued and which are still available in shops. Tested models are those that we've tested and that are currently available in shops. In some instances, at the request of members and when products are still available on the second-hand market and via sites like eBay, we also include models that were previously tested but now discontinued.