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.
How long should a water heater last? I have a 50 gallon 40,000 BTU water heater that was manufactured in 1988 and installed in March of 1992 in my house. I bought the house 5 years ago and the sticker on the water heater lists the install date and no service calls since.