Guardian Leak Prevention System with 3 Leak Detectors on sale for $248 https://www.homedepot.com/p/Guardian-Leak-Prevention-System-with-3-Leak-Detectors-GVD3/304585349
I use the Yi cameras at my camp, and after looking at options, went with two four-dollar thermometers from Wal-Mart to monitor temperature. I have a camera in basement and can keep an eye on the entry door, the furnace pilot and the thermometer. The upstairs camera covers the three doors, the upstairs LP furnace and the second thermometer. Since my camp's electric service is literally one line strung three miles through the woods, I went with a large (400 gallon) LP tank and two LP furnaces which do not require AC power to operate. In the event of an electrical outage, the heat will continue to stay on so long as the tank doesn't run out. https://www.amazon.com/YI-Wireless-...i+home+camera&qid=1554927015&s=gateway&sr=8-8 I have used these for about three years, and have had no issues from a hardware standpoint. Only complaints are the "motion" detection is overly sensitive, and to remotely view you have to use your phone (not a laptop, etc.). All in all, very satisfied with the purchase.