Bradford White sells through plumbers rather than big-box stores, so its tanks are common in homes that were professionally serviced. The serial is two letters then digits. The first letter is the year, on a 20-year cycle, so the decoder shows every year that letter could mean; the tank's condition and the ANSI year on the label settle it.
The first letter is the year and the second is the month. Year letters repeat every 20 years, so one letter can mean two or three different years.
HK16433183 reads as October 2011 or October 1991.
Two sources agree City of Palo Alto Utilities, InterNACHI water heater dating chart, Waypoint Property Inspection
A standard tank water heater usually lasts 8 to 12 years. Some make it to 15 with soft water and a replaced anode rod; some fail at 7.
How long does a tank water heater last? · Should I replace my water heater? · DC Dept. of Energy & Environment, InterNACHI
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Galvanized, polybutylene, cast iron and the sewer line: what fails, what it costs, what insurance won't cover and how to decide.
A buyer's guide to older homes: wiring, pipes, lead, asbestos, insurance refusals and what the repairs actually cost.
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