What an equipment serial number can and cannot tell you

Some manufacturers publish date fields inside serial numbers. Rheem’s illustrated water-heater layout labels month and year fields alongside a plant code and sequence. A reliable lookup first establishes that the submitted serial matches a supported layout; it does not treat the same character positions as universal.

UnitReveal interprets the characters you enter. It does not authenticate a label or confirm the model, fuel, capacity, configuration or installed condition from a date alone. Look for a separate reviewed model record or manufacturer document before relying on product specifications. A successful date lookup and a missing model record can both be correct.

A recall notice may depend on both a model and a serial range. CPSC’s historical Rheem 16-177 notice is one such example. Interpreting a production date does not determine whether those other conditions are met. Always open the official notice and compare the relevant identifiers.

Record the returned date with its source, precision and limitations. Keep installation evidence separately. Do not turn age alone into a conclusion about remaining life, safety or repair needs. Those questions require information that a character-based lookup does not provide.

Prepared by UnitReveal using the references below. Manufacturer-specific examples apply only to the equipment described by that source. This guide does not add lookup coverage for an unsupported format.