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Diagnose the Problem and Check Water Heater Age — Determine Your Water Heater's Age

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Hot Water Heater Lifespan: When to Replace Your Water Heater · Step 1 of 3

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First, understand that a lack of hot water is often due to sediment buildup which reduces the tank's capacity. Before attempting to drain the unit, it is crucial to determine the age of your water heater. Locate the serial number on the manufacturer's label. As shown on the Rheem model in the video, the first two digits often indicate the month of manufacture (e.g., '06' for June) and the following two digits indicate the year (e.g., '02' for 2002). If the water heater is over five years old, the sediment may be too compacted to be flushed out, and a replacement might be the only solution.

Goal: Determine if flushing is a viable solution based on the heater's age.

  • For water heaters older than 5 years, the sediment is often heavily caked in, and simply draining it will not solve the issue. The only repair in this case is likely a full replacement.
  • The method of reading the date from the serial number is not universal for all brands.
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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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If your water heater runs out of hot water after a short period of use, there is normally one major reason. Water heaters need to be drained periodically to remove sediment buildup as part of routine maintenance. This practice is not normally performed and the result is the water heater retaining sediment in the bottom of the tank. The more sediment buildup there is, in the bottom of the tank reduces the amount of hot water in the top of the tank. Before getting started, it is recommended you determine the age of the water heater. On water heaters newer than 5 years old, it is possible you can still get the sediment out by draining the heater. However, on water heaters older than 5 years, the sediment is usually pretty caked in there and most likely is there to stay. The only repair for this condition is replacement. You can usually determine the age of the water heater from the serial number. The first two numbers will normally be the month of manufacture and the second two numbers the year of manufacture. This is not always true. If the water heater is older than 5 years old, you can still try draining the heater. However, the sediment is more than likely embedded in the bottom of the water heater tank and will be very hard to get out. To drain the water heater, place the bucket at the bottom of the water heater drain valve and turn the valve counterclockwise until it stops to verify the valve is completely open.

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