Best hard wired smoke / CO alarm & monitoring for Sump Pump

[pizzinini]

A couple of thoughts:

If you decide to use a relay and contract sensor to connect your hard wired alarms, here is a great DTH:

[OBSOLETE] Universal Virtual Device Type and Translator

alarm could be an input since it has commands (strobe, siren etc) however contact only has attributes (open, close) a device can read the attributes of another device (probably not intended), but it can’t subscribe to any device attribute changes like a smart app. Now having said that, this DTH could in fact do this, but would require something to poll it, when the device is polled, it would then have a look at the contact sensor state, and then set the alarm attribute. This isn’t ideal obviously, and the ability of one device to retrieve attributes from another device that’s been selected in the preferences section I believe is something of an unintended “feature”, that I’m guessing ST will prevent in the future.

There is also the option to use a sound sensor to detect alerts:

Z-wave sound sensors to monitor existing smoke/co detectors?

As with most people, I already have numerous non-zwave smoke/CO/explosive gas detectors throughout the house. Instead of investing in a new set of z-wave compatible detectors, wouldn’t it be great if there’s an App/Device that can monitor the frequency of those detectors and alert me if any of them is activated? Sounds pretty straight forward and would be way cheaper than retrofitting with new z-wave devices. I leave my pets at home during the day and would love the peace of mind of knowing when any of those alarms sound. Are there any devices out there today that can do what I want? Z-wave sound sensors? Apps to analyze the sound frequency, etc?

For the sump pump you may want to look at this:
https://www.amazon.com/Aeotec-Aeon-Labs-DSB45-Sensor/dp/B00H3TJ3P4/ref=sr_1_1?s=hi&ie=UTF8&qid=1495032668&sr=1-1&keywords=aeon+water+sensor
You can put the sensor at the same level where your sump pump starts. This way you would get an alert every time. If you put it slightly higher, you would get alerts only when the sump pump fails.