The 7.5 is the hydrocodone strength and the 325 is the Tylenol strength. Taking a hydro with too much Tylenol with it is dangerous. It can cause liver damage. But anyway, back to the high. If you're a first time user of narcotic pills, the high is AMAZING.
While no one can determine exactly how long a water heater should last, a properly maintained, quality water heater can last 8 to 10 years. Of course, many factors will affect the lifespan, including electricity irregularities, the quality of the water heater, and the mineral density in the water.
Water heaters usually last well beyond the warranty period stated. However, the life expectancy varies greatly depending upon local water chemistry, system use, operating temperatures, and maintenance provided.