If you’ve noticed water dripping or trickling from the pipe running along the side of your water heater down toward the floor, don’t make the mistake of brushing it off as a minor inconvenience. That pipe — known as the temperature and pressure relief (T&P) valve overflow pipe — is one of the most important safety components in your home’s plumbing system. When it drips, it’s telling you something is wrong. Ignoring it could mean anything from wasted water and higher utility bills to a catastrophic tank failure.

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