Question about NRS Chronomite S-30L 220-240v Instant-Flow SR Tankless Water Heater

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Manufacture Date How do you determine the age of an existing unit?

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Where and how do I register my reliance hot water heater

Save receipt for warranty purpose.
Without receipt, the warranty is based on date of manufacture which can be several months, or 1-2-3 years before actual installation.
With reliance, first two digits of serial number are date of manufacture. Second two digits are week of the year.
Registration at following link using serial number located on label on side of tank:


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Aug 26, 2014 | Reliance Water Heaters

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Date of manufacture 81v400, serial r1194849014

1) Rheem 81V40 electric water heater ... manufactured pre 2009 ... posted serial number does not match manufacturer page 5

2) Possible date of manufacture 11-1994

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Mar 05, 2013 | Rheem 40 GAL ELEC TALL Water Heater 6YR SC...

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When was this model built?

You posted under water heaters.

Following information is for tank-type water heaters both gas and electric.
Look at label on side of tank.
You will see type and rating of water heater.
You can also see brand and serial number.

Serial number has date of manufacture, but each brand is different.
Open following chart to determine age of your specific water heater:

Add a comment for more free help.
Also take advantage of fixya phone service.
For a price, expert speaks with you over phone while you work on water heater or any do-it-yourself project.
Fixya is always less expensive than a service call.

Feb 08, 2011 | Water Heaters

1 Answer

What is the Date of Manufacture on a Rheem Model # 81V-40D Serial #0390B10720

manufacture date should be May of 2007 --- give or take a week or so.


Dec 29, 2010 | Rheem Water Heaters

1 Answer

How do i determine the manufacture date for a h w heater, serial # GE0801269835 - model # GE 20P6A Thank you Mark Stambach City of Auburn Maine Plumbing Inspector

GE uses MMYY as the first four digits of their serial numbers. That unit was manufactured in August 2001.

FYI, a nice little page on decoding water heater manufacture can be found here.

If this answer was helpful, please give it a vote. Thanks.

Jun 15, 2010 | General Electric GE SmartWater Household...

1 Answer

How do i determine the age of an echo cs2900 chainsaw?

You should be able to find your answer here in the data base.

Jan 07, 2010 | Water Heaters

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