UK group Which? urges homeowners to set radiators to 2–3 for lower bills and frost protection when away.

On November 4, 2025, UK consumer group Which? advised homeowners to set radiator dials to no higher than three to reduce energy bills, noting each setting corresponds to a specific temperature. The expert recommended keeping bedrooms between two and three for comfort and efficiency, while avoiding maximum settings like five. Radiators should be set to frost protection when homes are unoccupied to prevent freezing. The advice, shared via TikTok, aims to help households manage heating costs through simple adjustments.