These are primarily products for the US - not the UK
As others have pointed out there is not a lot of benefit to having these in the Uk where many (most?) people have radiators. In the US I have never seen a building built in the last 100 years that has radiators - everywhere has forced air heating (and central AC in most areas). That is what these products are designed to address - mostly very large (by UK standards) open plan homes with forced air heat or AC and huge temperature differentials between the inside and outside.
When I lived in Duluth, MN, it was common for people in older houses to have $1000/month heating bills and in Tucson AZ, similar air conditioning bills. In those scenarios "intelligent thermostats make a lot of sense. In scenarios with more modern heating systems or less extreme climates, the payback is going to be much longer
Biting the hand that feeds IT
