In this case it really is better to be a "master of one" and not a "jack of all trades"!
For example, a dedicated alarm system with the possibility of a simple integration via IFTTT at a later date (for example giving armed, disarmed and alert status) may be a better choice rather than trying to add alarm system functionality to your existing heating control system. In this case it really is better to be a "master of one" and not a "jack of all trades"!