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How old is my tankless water heater?
24 tankless water heater brands catalogued, 16 with a sourced serial format you can decode here. Pick your brand; the serial format depends on it.
- 16 of 24 tankless water heater brands on this site have a sourced serial number date format.
- The InterNACHI Standard Estimated Life Expectancy Chart for Homes lists Instant (on-demand) Water Heater at 10 years of expected service.
Brands with a decoder
A.O. Smith2008 to present1 formatAmerican Water Heater2008 to present1 formatBosch (HVAC)before 20091 formatBosch Water Heaters1998 to 20091 formatBradford White1984 to present1 formatNavienera not stated1 formatNoritzera not stated1 formatRheemera not stated1 formatRichmondera not stated; era not stated; era not stated3 formatsRinnaiera not stated1 formatRuudera not stated1 formatRuud Water Heatersera not stated; era not stated; era not stated3 formatsState2008 to present1 formatStiebel Eltronera not stated1 formatTakagi2010 to present; before 2009; 2008 to present3 formatsWestinghouse Water Heaters2011 to 20211 format
Brands catalogued, format not yet sourced
- Ariston
- EcoSmart
- Ecosmart / Marey / Titan (electric tankless)
- Eemax
- Eternal
- HTP
- Lochinvar
- Rheem Water Heaters
Where the data plate is on a tankless water heater
On the side or bottom of the wall-hung cabinet, or inside the front cover on the frame.
General guidance, not brand-specific: the owner's manual or the installer can point to the exact spot. See the data plate guide.
For scale only: the InterNACHI Standard Estimated Life Expectancy Chart for Homes lists Instant (on-demand) Water Heater at 10 years of expected service (nachi.org). That chart is a guideline, not a prediction for your unit.