
Customers need to take their old appliance into store at the time of collection in order to receive the discount.
Online, customers can save an additional 20% off by entering a promotional code and tick the ‘Scrap product collection service' option.
The move follows calls from the British Retail Consortium for the Government to offer a white goods scrappage scheme to encourage a switch to energy-efficient devices.
Sony is currently running its own up to £150 cash back scheme for new Bravia TVs.
Comet recently signed its first major TV sponsorship deal with ITV to be the new sponsor of ITV1's popular game show Who Wants To Be A Millionaire?