a place of confinement for persons held in lawful custody the captain ordered that the prisoner be thrown into the brig immediately Synonyms bastille, big house [slang], bridewell, jail, calaboose, can, clink [slang], cooler, coop, guardroom, hock, hold, hoosegow, jailhouse, joint [slang], jug, lockup, nick [British slang], pen, penitentiary, pokey ...
Clue #1: Age. The older the water heater, the more likely it is to break down. As a general rule, a tank type water heater will last, on average 8 to 12 years. With proper maintenance and a little luck, you may be able to nearly double the lifespan of your water heater. But sometimes even with the best care, a water heater will need to be replaced after only a few years.
The next consideration is life expectancy. Often, electric hot water heaters last longer than natural gas units due to the lack of corrosion and deterioration from the gas fired flame on the bottom of the inner tank. This does vary considerably depending on the mineral content of the water in your area.