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We don't use a specific eco mode on our heat pump dryer, but i did think the which figures for heat pump VS others are interesting
On average, the heat-pump dryers on our site will cost around £68 per year to run, based on drying three loads per week every week for a year.
In contrast, vented dryers cost around £167 per year to run and condenser dryers cost on average £170 a year to run, with the most energy-hungry of each type costing more.
So owning a heat-pump dryer will save you on average around £102 a year compared to a condenser dryer.
Ah, this was the Which article
https://www.which.co.uk/news/article/will-using-eco-mode-on-your-tumble-dryer-save-you-money-aX1Hh2S5YfN3