The boiler is very efficient. But the accompanying app is not user friendly. If you choose to lower or raise a temperature, the app is not intelligent enough to go to the original temperature when the timer changes. My nest app could do this previously. It could do with integrating with apple HomeKit or google home etc. The inclusion of geolocation would also be useful. A simple away button or home button to reactivate when away would be very user friendly. The inclusion of Bluetooth connectivity in case of WiFi failure would also be useful as not all people have their boilers physically within a readily accessible part of their property.