From Joe in a recent thread:

"Hey Bill here's an example:
http://www.homedepot.com/p/Diversit...nEB6_mTiSo
They sell an alarm that goes with. "

Joe, much appreciated.

I ordered one from my supplier.

I like that it's 24 VAC operated so that I can power it from the HVAC 24 VAC.

Assuming this works as advertised, I'll order some more, and then wire them as you would 4-wire smoke detectors, including an EOL relay to detect if the monitoring circuit breaks.

I have a number of water connections up in the attic that I'd like to alarm.

Many thanks!

Best regards,

Bill