ToftThis covers Bradford White, Jetglas, Defender. The serial number is on the rating plate on the side of the tank. The ANSI date on the same plate can tell you which of the possible years is right.
Two letters, then digits. The first letter is the year and the second is the month (A is January, I is skipped). The year letters skip I, O, Q, R, U and V, and start again every 20 years, so each letter stands for more than one year.
Example: HK16433183 was made in October 1991 or October 2011.
This is the date the unit was made. It was usually installed soon after, but it can be later. If a serial doesn’t fit any of these patterns, look on the label for a printed manufacture date.
Checked in October 2026.
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