Lou Card makes a point! When a hot water tank goes, it doesn't make popping sounds which could either be air or the normal sound of expansion during the heating cycle. You'll know when a hot water tank "goes" because it will begin leaking! Not sure how long the warranty is on hot water tanks installed in TV but I'll bet it's 10 years. If so, it will go just before or just after the ten year mark. The manufacturers have it down to a science. Some homes are installed with a small expansion tank on top of the hot water tank. These small expansion tanks have a rubber bladder and are beginning to fail for some at the 5 year mark. If these expansion tanks are not replaced normal pressure in the system will force water to pass from the pressure relief valve on the side of the hot water tank.
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