I purchased my breakout box from J&L, as well as three Digital Aquatics float switches (one Switch Kit 1 and one Switch Kit 2).
I have two switches at the same level (on the same bracket), and one a bit higher. The two at the same level are the "main" switches. I have two in case one fails or sticks. The third switch is mounted a couple of inches higher than the other two and is my "emergency" switch. The emergency switch shuts of the ATO and sends me an email alert.
I'd give you the code . . . but it looks like our IP address has changed again and I can't access it right now.
I'm thinking about this water on the floor sensor:
http://www.specialtyalarms.com/site/...product/80-519
I'm not 100% decided yet, though. It seems some people have had a bit of trouble with them.