Best Water Sensor for 2Gig Panel

I would like to add a water sensor near the base of my water heater (which flooded today). What sensor would work best with my Surety monitored 2Gig GC3 panel? Any advice would be appreciated.

We currently sell the 2GIG-FT6-345 here. It can detect floods and also dripping leaks if placed under the drip source.