are dyson heaters expensive to run?
So a 3kW heater will use 3kW (3000 watts) per hour and cost roughly 43 pence to run* or £3.43* for 8 hours! The power rating (watts/kWs) will dictate the running costs; the higher the watts the more it will cost to run. For a quick comparison see Sust-it's Electric Heating Cost Calculator.