Recognizing that a water heater has catastrophically "blown" or ruptured involves observing dramatic physical evidence. Key indicators include a sudden, massive surge of flooding water filling the utility room or basement, a loud bang or rumble preceding the rupture, complete loss of water pressure, water spraying uncontrollably from split tank walls or seams, and a tripped temperature and pressure (T&P) relief valve discharging steam and water. Verification: Shut off the main water supply valve and electrical power instantly to mitigate destruction.
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