The rule of thumb is that an appliance that is rated at *x*W will cost £x if run 24/7 for a year.
(See: https://energy-advise.com/2011/09/23/how-much-does-it-cost-to-use-a-100-watt-bulb-for-1-hour/ )
I just bought a new dehumidifier (the only one was 30+ years old!) and it's rated at 265W. Putting that on for 6 hours a day 6 months of the year = 265/4/2 =~ £33
@Greenbank started
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The rule of thumb is that an appliance that is rated at *x*W will cost £x if run 24/7 for a year.
(See: https://energy-advise.com/2011/09/23/how-much-does-it-cost-to-use-a-100-watt-bulb-for-1-hour/ )
I just bought a new dehumidifier (the only one was 30+ years old!) and it's rated at 265W. Putting that on for 6 hours a day 6 months of the year = 265/4/2 =~ £33