I have the door contacts now for half a year in operation. The link with the Heizkörperthemostaten was tucked away in the menu, but when it is set up, it works quite well - until the batteries are empty! When the batteries need to be replaced, the devices can then not again in the RWE SmartHome configuation integrate! I tried for hours in various ways - unfortunately without success. The call bie the hotline then brought the solution: leave and replace one Chicken! It is a series fault. But unfortunately takes RWE his faulty products not itself back, but insists on the settlement through the retailer. Especially unfriendly I find that RWE their customers does not indicate the series errors and offers no simplified settlement procedures. Overall, the smart home causes more work than it saves. Regle default appear any error messages. I would not install it again.