Bosch Water Heater Age Lookup
Bosch water heaters - from Tronic electric tanks to Greentherm tankless units - carry a date code that isn't obvious at a glance. Our decoder reads it for you and returns the true manufacturing date and age. Free and accurate, no signup.
Protect your water heater and 20+ home systems with a home warranty
Get a Free QuoteShare this tool with friends!
The world's best water heater tool
Finding Your Bosch Serial Number
Check these four spots on your Bosch water heater
Common Locations
What to Look For
- White or metallic manufacturer sticker
- Labeled "Serial No." or "S/N"
- Typically 8–12 characters long
- Usually near the model number
Can't find it? Try removing access panels or checking behind the temperature dial.
Bosch Serial Number Examples
Don't worry if yours looks different - Bosch has multiple formats and our system can decode most variations.
About Bosch Water Heaters
Bosch water heaters bring German engineering precision and over 130 years of manufacturing excellence to residential and commercial water heating solutions. Founded in 1886 by Robert Bosch, the company has grown into a global technology and services leader operating in over 60 countries. Bosch Thermotechnology, the company's heating division, combines innovative design with rigorous quality standards to produce high-efficiency water heaters and boilers. The brand entered the North American tankless water heater market with advanced European-developed condensing technology, offering efficiency levels and compact designs that appeal to green builders and energy-conscious homeowners. Bosch products meet strict European Union energy and emissions standards, often exceeding North American requirements.
Bosch manufactures premium tankless water heaters and electric mini-tank models engineered for exceptional efficiency and reliability. Their Therm series condensing tankless units achieve Uniform Energy Factors up to 0.96 through stainless steel heat exchangers and advanced combustion management. The compact wall-mounted design saves valuable floor space compared to traditional tank heaters. Electronic controls provide precise temperature regulation with minimal fluctuation, while self-diagnostic systems monitor performance and alert users to maintenance needs. Outdoor installation capabilities eliminate indoor space and venting requirements. Electric Tronic mini-tank models provide point-of-use hot water for remote fixtures, eliminating wait time and reducing water waste. All Bosch water heating products emphasize quiet operation, space efficiency, and long-term durability through quality component selection and thorough factory testing.
Bosch supports its water heaters with comprehensive warranty protection including up to 15 years on heat exchangers for tankless models, reflecting the company's confidence in product longevity. The Bosch Pro Network connects customers with factory-trained contractors who understand proper sizing, installation, and service procedures. Technical support specialists provide assistance with product selection, troubleshooting, and warranty claims. Detailed installation manuals and service documentation support proper setup and maintenance. Bosch uses proprietary date code systems that evolved through multiple formats from 1965 to present, with modern serial numbers incorporating manufacturing date information. Professional technicians familiar with Bosch products can decode these systems to verify age and warranty coverage, ensuring customers receive proper service and support throughout the product lifecycle.
Where to find the serial
Bosch tankless water heaters have the rating plate on the bottom or right side of the wall-mounted cabinet. The serial is long and includes letters - it's labeled FD (FertigungsDatum, German for production date) on European-style units and SER on units sold under the Bosch Thermotechnology brand in North America.
What the serial actually looks like
Why the age is worth knowing
Bosch tankless units carry 10 to 15 year heat exchanger warranties depending on the model and 5 years on parts. The most common service issue is the flow sensor sticking after a few years of mineral exposure - a $40 part that takes 20 minutes to swap. The Therm 940 series and the Greentherm 9000 series have very different service parts so identify the exact model before ordering.
Quick answers for this brand
Why is Bosch's date code so weird?
Bosch uses an internal FertigungsDatum (FD) production date code that maps to months via a rolling lookup table, originally designed for European industrial tracking. The format isn't human-readable without the table, which is why a decoder is genuinely useful for Bosch units. Don't try to read it as YYWW or YYMM - the digits don't mean what they look like.
Is Bosch still selling water heaters in North America?
Bosch has scaled back its tankless presence in North America significantly since 2020, focusing more on heat pumps and HVAC. Existing units are still supported for parts and warranty through Bosch Thermotechnology, but new installations are less common. Replacement units are often Rinnai, Rheem, or Navien.
Where can I find parts for an older Bosch Therm?
Bosch parts distribution in North America runs through a network of HVAC distributors and a few online specialty suppliers. Common parts (flow sensors, igniters, gas valves) are still available, but specialty boards for older AquaStar models can be hard to find. Bosch tech support at 800-642-3199 can help locate parts.
Protect your water heater and 20+ home systems with a home warranty
Get a Free QuoteShare this tool with friends!
The world's best water heater tool