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Water heaters date-code guide

Richmond Water Heaters serial number lookup

Richmond is a Rheem retail brand, and many residential water-heater models share the Rheem month/year serial convention near the beginning of the identifier.

Parent
Rheem Manufacturing
Common code
After an optional plant letter, four digits commonly encode month/year; some lines use week/year.
Reviewed
August 8, 2026

Instant equipment lookup

Decode the manufacturing date

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Equipment type

Using After an optional plant letter, four digits commonly encode month/year; some lines use week/year.

Type exactly what is printed. Spaces and dashes are ignored.

Optional: add model number for capacity cluesAdd model

Model decoding is labeled as a clue unless the exact format is documented.

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EQUIPMENT DATA
MODEL24ABC636A003
SERIAL5019X30312
WeekYear

See exactly how the code was read

SerialAtlas highlights the date characters, names the matching rule, and shows alternative interpretations when the code is ambiguous.

  • Current age calculated automatically
  • Confidence and rule source shown
  • Optional model-capacity clue

Evidence-led route update

Richmond Water Heaters date-code evidence

If you need to estimate a Richmond water heater’s manufacture age, identify the complete Rheem-family label before decoding.

Identify the Rheem retail water-heater family first

After an optional plant letter, four digits commonly encode month/year; some lines use week/year. The catalogued Richmond family uses the Rheem water-heater evidence: an optional plant letter may precede month/year, while some product lines use week/year. The verified Richmond family uses the Rheem water-heater pattern in which an optional plant letter may precede month/year and some products use week/year. Tank and tankless label context should stay visible beside the serial.

Worked example: M092504723

M092504723 — The primary documented read is September 2025; the decoder keeps another plausible interpretation visible so the label and equipment era can resolve it.

When Richmond registration is the real question

A Richmond age estimate is only a manufacture reference. Registration, ownership, parts, and warranty questions require the complete model and serial through Rheem’s official route, not a fabricated lookup result.

Model number vs. serial number

Use the Richmond model for product-family context and the serial for date candidates; retain the tank/tankless type for support. Keep the model, serial, tank or tankless type, and official support path together when a registration or service question follows the age estimate.

Limits and official support

Rheem-family retail and specialty lines can require a different format check. If the result affects warranty, registration, parts, safety, or replacement decisions, use the complete model and serial with the manufacturer or a qualified professional. SerialAtlas is an independent reference, not an official warranty lookup or warranty coverage decision.

Open Richmond Water Heaters support route

How to read a Richmond Water Heaters serial number

After an optional plant letter, four digits commonly encode month/year; some lines use week/year. SerialAtlas removes spacing and punctuation, then applies only the documented rule families mapped to Richmond Water Heaters. The lookup remains in the browser.

Try this documented-style exampleM092504723Load example

Equipment covered

  • gas tank water heaters
  • electric tank water heaters
  • heat-pump water heaters
  • tankless water heaters

Commercial, imported, very old, specialty, and private-label equipment can use a different code. Confirm the full rating plate before accepting a result.

Where to find the rating plate

  • Upper or lower side of the tank jacket
  • Near the gas control valve on gas models
  • Behind an electrical access panel
  • Side or bottom edge of a tankless cabinet

Why more than one date can appear

Two-digit years and repeating letter cycles can point to more than one era. SerialAtlas ranks the plausible dates but keeps materially different alternatives visible. Label design, refrigerant, installation records, and product literature can resolve the era.

Source and verification

Inspector Handbook open reference data (CC BY 4.0). Independently implemented and reviewed August 8, 2026.

Open reference source

What this result does not prove

A manufacture date is not an installation date, warranty decision, recall match, condition assessment, or replacement recommendation. Confirm high-stakes decisions with the manufacturer or a qualified professional.