Smith water heaters have two different formats of serial number, depending on the year it was manufactured.Įxample: 15051234567 = the 5th week of 2015 (early February) Need a new Rheem water heater installed? A.O. Rheem water heaters have a similar format to Rinnai, just in reverse the first two letters of the serial number are the month of manufacture, and the second two letters are the year. Need a new Rinnai tankless water heater installed? Rheem The first two letters are the year, and the second two letters are the month. Need a new Navien tankless water heater installed? RinnaiĪ Rinnai water heater has a simple Year/Month format of serial numbers. Navien water heaters might have several formats of serial number, but they will all contain at least the year of manufacture. Need a new Bradford White water heater installed? Navien The first letter of the serial number is the year, and the second letter is the month. Bradford Whiteīradford White water heaters manufactured 20 years apart will have the same letter designation in their serial numbers. The formats vary by manufacturer, so check which brand of water heater you have and reference it with the information below. If you can’t find the installation date, the water heater serial number can be used to determine the age of your unit. The first step to determine age of hot water heater is to check for a manufacturer label on the water heater’s tank (or on the side of tankless water heaters), which should include the installation date. And when a water heater fails, it can be inconvenient or downright catastrophic. Preparing for the inevitable end of its lifespan will save you a headache down the road when the water heater repairs start to stack up, it’s good to know if it’s worth the maintenance, or if you’d be better off with a new water heater. You should be aware of the year of manufacture of the water heater installed so that you know roughly when to start looking for a replacement. Depending on the type of fuel and model, the lifetime of water heaters can be anywhere between 10 to 20 years. Whether you’ve recently moved into a new house or have simply forgotten the age of your current unit, figuring out how old a residential water heaters are can be tricky.
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