Need help in determining age of water heater please. It is an American Appliance Mfg Corp 40 gal natural gas fired water heater, serial # 1914654. I have used the calculator that NACHI has provided, and when I plugged in the numbers, the response was, " Invalid Serial number". Any assistance on this will be appreciated.
The first two numbers are the year it was manufactured and the second two number are the week within that year that it was manufactured.
For example, if the first 4 digits of the serial numberare 9932, then it was manufactured in the 32 week of 1999.
I believe your serial number is I914654 with that first digit being the letter I rather than the number 1. Some manufacturing plants, especially the older ones, took a while before upgrading their stamping machinery so that there was a distinct difference between the letter I and the number 1.
AAMC went through some changes in 1990 that also affected how they coded their serial numbers. Most manufacturing plants west of the Mississippi apparently went to using a serial number starting with a letter and followed with 6 digits. East of the Mississippi continued using their older 10-digit serial number. However, there are 10-digit serial numbers starting with a letter and some that do not include a letter. One will occasionally also find 11-digit serial numbers that start with one letter followed by 10 digits. Most of the confusion occurred in the 1990-1994 period.
I’m still researching where the 11-digit numbers came from.
So, to answer the original question, I believe you have a water heater manufactured in the 46th week of 1991.
Russel I see your on the board alot, quite the charactor. You tell it like it is. Grasshopper? oh if you only could talk to my freinds, I don’t do much of anything in slow mode. Don’t get me wrong I do a through inspection but as a HVAC installer and general contractor time is of the utmost importance and am always thinking of the next step which makes me appear grasshopper like.
I thought I have? I have 7.0. I’ll try to update but am one dialup connection and it takes like and hour. So thanks and I’m going to hit download and go to bed and let it do it’s thing. Getting up early have a bathroom remodle to start, (should take me about 20 mins hehe)