Corrosion: Visible corrosion on your water heater is a worrying sign, and it means that it should be replaced as soon as possible.Older water heaters are less efficient, so your bills might increase over time. Elevated Electricity or Heating Bills: Almost 20% of your annual household energy bills cover the costs of heating your shower and other hot water.Less Hot Water: If there is less hot water available than there used to be when you are taking a shower, it might be a sign that your hot water heater is accumulating sediment or unable to provide enough heat for an average shower.Age of the Unit: Once the water heater is past the 10-15 year mark, it will be less energy efficient and need to be replaced.Some of the signs that you need to replace your water heater include: Water heaters are designed to be durable and last a long time with proper maintenance, but there are subtle signs that can indicate it’s time to replace sooner rather than later. Once you determine the age of your water heater, you should take steps to think about whether or not it’s time to replace it. When Should You Replace Your Water Heater? Newer models use letters to represent the month and year, but in older water heaters that were manufactured before 2010 they used exclusively numbers. Rinnai: Rinnai’s water heaters use two different serial number patterns. You can determine the age of the water heater by de-coding the serial number.Much like other companies, they use the A-M system to signify the month and then use two digits after it to represent the year. In the first format, the first two numbers are the year and the second set of numbers are the week. One uses only numbers and another uses a combination of letters and numbers. State Industries: This manufacturer has a confusing formula to determine the age of your water heater.Smith does, including the differences between models made between 1997-2008 and after 2008. Smith, so they use the same code that A.O. American Water Heater: This brand is associated with A.O.The first letter is the year and the second letter is the month. Bradford White: Bradford White uses a simple two-letter code to give the date of manufacture.This manufacturer does not include the month or week that units were built, so you will only get information about the year it was made. Next, you’ll see a number that shows the year it was made and another letter. You will see four different numbers that are followed by a letter. Navien: This manufacturer uses a very different approach.The four digit code is the third through sixth digits in the serial number, so it will read xxMMYYxx. Models made after 2000 have the month and year of manufacturing in the serial number. Rheem: The age of your water heater is fairly easy to find if you have a Rheem water heater.Current models return to the pre-1997 format. A is January and M is December, and the two numbers after the letter are the year. For models made between 1997-2008, there will be a number followed by a letter between A and M (but excluding I to eliminate the confusion between 1 and I). For any models created before 1997, the year and week are in the first four numbers of the serial number. Smith: This manufacturer uses a simple system.
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