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How do I tell the age of a Rinnai water heater from the serial number?
Sunday, August 12, 2018
There are two different formats for a Rinnai serial number. The first one was used until mid-2009, with an example shown below. The first two digits are the year and the second two digits are the month of manufacture. The manufacture date may also be stated after the serial number.
Starting in late 2009, it was switched to a letter-code, with first letter of the serial number being the year and the second letter the month of manufacture.
A = 2009 or January, B = 2010 or February, C = 2011 or March
D = 2012 or April, E = 2013 or May, F = 2014 or June
G = 2015 or July, H = 2016 or August, J = 2017 or September
K = 2018 or October, L = 2019 or November, M = 2020 or December
So the serial number above indicates the water heater was manufactured in January, 2013. To determine the age of another manufacturer/brand of water heater, go to How do I determine the age of my water heater?
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Field Guide for Home Inspectors, a quick reference for finding the age of 154 brands of HVAC systems, water heaters, and electrical panels, plus 210 code standards for site-built and manufactured homes, and the life expectancy rating of 195 home components. Available at amazon.com for $19.95.
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