Observed arrival · 2026-10-29
Age From Serial decodes water-heater and HVAC dates
A browser-based decoder uses equipment brand and serial number to show a water heater or HVAC unit’s manufacture date, the rule used, and its source.
○Open
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$Paid
†Ads
✦Pretty
●Pro
◎Niche
◉Human
⚑Risk
ƒJS
- For
- Homeowners checking water heaters or HVAC equipment
- Worth noticing
- Ambiguous year codes can produce multiple readings, and the page says serial and model numbers stay in the browser.
Field notes
The brand list groups related labels under parent-company rules and marks some readings, such as American Standard under Trane, as inferred. For ambiguous codes, the page says it returns every date allowed by the published rule and excludes only impossible dates; it also separates manufacture date from installation date and points readers to plate-location and refrigerant guides.
Observed signals
Read the marks
Editorial observations of this landing page, not a rating.
○OpenPublic substance visible
✦PrettyNotable craft visible
●ProPolished or operationally mature
◎NicheUnusually specific use
One card from the complete issue