Water heaters can fail gradually or all at once. Both need a fast response.
Turn off the cold water supply valve at the top of the water heater, and switch off power at the breaker for electric units or the gas supply for gas units.
A slow leak from a fitting is a different situation than a full tank failure, which can release many gallons of water quickly. Tank failures are more likely to affect a wider area, especially in basements and utility closets.
These are often enclosed spaces with limited airflow, which makes trapped moisture and mold risk higher if drying isn't thorough.
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