All UK guides
Electric heaters
Fan, ceramic, oil-filled and panel heaters — cost per hour at the Ofgem cap.
39.5p per hourElectric blankets
Under-blankets and heated throws — pennies per night, verified wattages.
3.2p per hourBean-to-cup coffee machines
De'Longhi, Philips, Siemens, Sage — cost per cup with electricity, beans and milk.
0.8p per cupRobot vacuums
Roborock, eufy, Tapo, Shark — electricity per charge and the consumables bill.
Plug-in solar kits
Legal since August 2026 — compliant kits, yearly savings, payback years.
£112.44 Saving per year, tilted (60% self-use)Why running cost, not price
A 2 kW heater costs 52.6p an hour at today's cap. Run it four hours a night through December and it adds £63 to the bill — more than a cheap heater costs to buy. An electric blanket does the same job for one person at 3p an hour. A bean-to-cup machine uses under 1p of electricity per cup; it is the beans that cost. Plug-in solar, legal since August 2026, earns back about £110 a year. None of that is on the price tag, so we put it next to every product.
How the numbers are made
Every figure is rated power (or capacity) from the product's Amazon.co.uk listing × hours × the Ofgem unit rate in force this quarter. No efficiency fudge factors, no estimates where the seller publishes nothing — those products say 'not published'. The tariff and its source are shown at the top of each page, and we rebuild the whole site when Ofgem announces the next cap. Read more on the about page.