Octopus Energy Cosy 12

The U.K. has pledged to reach net zero greenhouse gas emissions by 2050, but as it stands, 80% of its heating demand is met by fossil fuels. Octopus Energy, the country’s largest energy supplier, hopes to accelerate the shift to cleaner heating. “In the U.K., our homes are really old, which is part of the charm,” says Octopus heat pump program director TJ Root. “But those bigger, older homes need more heat.” In 2026, Octopus released the Cosy 12, its most powerful smart heat pump system to date, which runs on electricity and is designed specifically to warm large, older homes up to four times more efficiently than a gas boiler, according to the company.