Legacy three-digit date table
388123456
August 2003.
Water heaters / Bosch
How old is my Bosch water heater?
BoschChange
Ad space (kept empty until an ad network is approved)
Where to find the serial number
On tankless models, check the side or lower edge of the cabinetBosch serial formats we can read
Dark = year, orange = month or week.
Coverage and sources
Legacy 1998–2009 nine-digit serials, with optional FD prefix, only. The full three-digit table determines both month and decade. Modern long serials and other Bosch products are excluded.
References checked 2026-10-26.
- www.building-center.org/bosch-water-heater-age/
- www.building-center.org/wp-content/uploads/2017/08/BOSCH1-Tankless-Water-Heater-Age.jpg
Independent reference tool, unaffiliated with Bosch. Sources & method