Is this a question or a comment?
This topic was covered before, but in summary:
Heat detectors are designed to respond to high levels of heat characteristic with a rip-roaring fire. Unfortunately this means the conditions may not be suitable for escaping the fire. Smoke detectors are life safety devices because they go off early enough to give people a chance of escaping the building before it is too late. Therefore, heat detectors are more intended as property protection than life safety.