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Diagnose the Leak — Thoroughly Inspect Your Water Heater's Condition

Beginner1 hour

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Hot Water Heater Lifespan: When to Replace Your Water Heater · Step 3 of 3

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In this video

Observe the area around the water heater for puddles of water. Check the drain valve at the bottom of the tank to ensure it's not the source of the leak. Follow the T&P (Temperature and Pressure Relief) valve's discharge pipe down to the floor to see if water is dripping from it. Tap on the expansion tank to check if it's full of water; a solid, non-hollow sound indicates the internal bladder has failed and the tank is water-logged, which is the likely cause of the T&P valve leak due to excessive pressure from thermal expansion.

Goal: Water Heater Repair

  • A working expansion tank should sound hollow on top (where the air is) and more solid on the bottom (where the water is). A completely failed tank will sound solid and feel heavy.

Used in this video

  • Flashlight (brand: Unknown, Tool Type: Hand Tools, Power Source: Battery-powered, Purpose: Illumination) · optional — To illuminate the area around the water heater to find the source of the leak.
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Matt Risinger

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FAQs

What essential tools or equipment do I need to inspect my hot water heater for replacement?

You'll primarily need a flashlight to illuminate hard-to-reach areas and inspect the tank thoroughly. A camera on your phone can also be helpful for documenting issues or getting a better view of cramped spaces. No specialized tools are required for this assessment.

What are the most critical safety precautions to take during the water heater inspection?

Always be mindful of hot pipes and electrical connections. If your water heater is gas-powered and you detect any gas smell (rotten eggs), immediately leave the area, do not operate switches, and contact your gas utility. Avoid touching severely corroded or leaking areas with bare hands.

How can I accurately determine my water heater's age if the label or sticker is missing or unreadable?

The manufacturing date is usually encoded in the serial number, often using a letter for the month and two digits for the year (e.g., F10 for June 2010). You can typically find a deciphering guide on the manufacturer's website or by searching online with your brand and serial number format.

Besides active leaks, what less obvious signs of wear and tear should I look for that indicate my water heater might need replacement?

Look for dried water streaks, discoloration, or corrosion around fittings, the pressure relief valve, and the bottom of the tank, which could signal past or intermittent leaks. Also, listen for persistent popping, rumbling, or banging noises, often indicating significant sediment buildup.

Transcript
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So here we get a water heater, we've got to leak on the floor as you can see here, electric water heater, so we kind of looked already, double check to see if there's any water coming out of the drain here, that's not it, but we did however, notice that we've got water coming out of the pressure, the piping that goes to the pressure relief valve, so 9 times out of 10, that usually is a problem with an expansion tank. This expansion tank here, what allows the water inside of the system to do is have a place to expand. When the water heater turns on, when it heats up, molecules expand, they have to have somewhere to go, and you don't want that trying to burst the pipes in your plumbing system. So you have an expansion tank, and inside of this expansion tank, you have a little rubber bladder that's full of air on one side. So as the water heats up, it's able to push against that air, compress it as it cools down, it's able to expand back out, water temperature heats back up, expands against that, that compresses that air, compresses it, back and forth, that's basically how it works. But after a while, these things get little holes in them, and they become full of water. Now she can come here and see this one's full, so what we're going to do is just turn the

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