"Well, it is basic device so you cannot expect miracles. Easy to install and does the job. I have used it for gravity fed heating system but it is designed to work with Combi Boiler, and manual is designed to replace thermostats connected to combi boiler.
If you know what you are doing, you can use it with any system it is for you, but if you are basic DIYer and looking to replace like-for-like for gravity fed system, then find some other option"
"Called Drayton to complain that the thermostat was not acurate (it read 15 when room was 20). They said it was one of their simplier thermostats and should not be at fault. \they did offer to replace it but in the meantime what shall we do - freeze? What a con!!!!!!!!"