This 26" aluminum drain pan will fit nicely under your 50 gallon, approximately 24" diameter storage tank hot water heater. Protect your floor from water heater condensate or if your hot water heater springs a leak, this drain pan will catch the water before it gets everywhere. Included is a 1" - 1-1/2" PVC drain fitting for easy draining. It is 26" in diameter and 2" deep. It can be used with either gas or electric water heaters.