In article ,
"john" wrote:

These 'drain pans' only hold a maximum of like a gallon though right ?

Well, let's see, the one our plumber put in our attic at work recently
was about 2 feet in diameter and about 6 inches deep. That's about 1.57
cubic feet. Nearly 12 gallons. With a battery operated alarm, should be
plenty of warning of a failing tank.