I felt smoke alarm was un-natural product for Nest, but again they were the men in arena and its their company - much respect there. I was anticipating somethin

I felt smoke alarm was un-natural product for Nest, but again they were the men in arena and its their company - much respect there. I was anticipating something like a device that lets timing for water heater and calibrate the temperature etc. but I guess there are just too much variety of water heater systems for that, but it would be cool and reduce gas bill and in a true nest fashion would pay_for_itself. But this device also show-cases how bringing "smartness" into safety devices is fraught with risk and in the case smoke detector the convenience is not worth the economics. The Nest thermostat was true win-win value proposition - where as the Smoke detector is just not that.