Humidifier Float Valve

[superduperwesman]

Yeah I have 2 float valves wired to a sprinkler valve for my tank ATO. And I also have the sprinkler valve on a timer so it only has power for 2 min 6 times a day. So It has a fair amount of protection. If the first float fails then I have the second and if it fails too then hopefully full water for 12 min a day won't flood the tank before I notice.

The humidifier float is just for my water changing. Like sphelps said, just a safety mechanism in case I forget that I'm filling the can while watching tv or something. I assumed that they were pretty reliable if they're used in humidifiers but I wasn't sure if maybe humidifiers had another safety mechanism that I was unaware off? And I wasn't sure how often these need replaced / have problems but it doesn't sound like anyone has had any?