Lochinvar Water Heater Age Lookup
Lochinvar is a go-to name for residential and commercial water heating. Enter your serial number to find the exact build date and age of your Lochinvar unit. No cost, no account.
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Finding Your Lochinvar Serial Number
Check these four spots on your Lochinvar 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.
Lochinvar Serial Number Examples
Don't worry if yours looks different - Lochinvar has multiple formats and our system can decode most variations.
About Lochinvar Water Heaters
Lochinvar water heaters and boilers represent the premium standard in commercial and high-performance residential water heating, with a heritage extending back to 1939 when Lochinvar Corporation was established in Nashville, Tennessee. Now a division of A.O. Smith Corporation, Lochinvar maintains its identity as a specialist in high-efficiency equipment designed for demanding applications. The company earned industry recognition for introducing North America's first fully modulating condensing boiler and continues to lead in efficiency innovation. Lochinvar products are specified by mechanical engineers for commercial buildings, institutions, and luxury residential projects where performance, efficiency, and reliability are paramount. Their ENERGY STAR certified portfolio and focus on sustainable technologies align with modern green building standards.
Lochinvar manufactures an extensive range of products including high-efficiency commercial gas water heaters, condensing tankless systems, pool and spa heaters, boilers, and volume water heaters. The KNIGHT series commercial boilers achieve up to 95% AFUE efficiency with fully modulating burners and stainless steel fire-tube heat exchangers. The ARMOR residential condensing water heater delivers 96% thermal efficiency in a compact footprint suitable for mechanical rooms and outdoor installations. Copper-Fin tank water heaters feature finned tube heat exchangers that provide exceptional recovery rates for high-demand commercial applications like restaurants and hotels. The NOBLE combi-boiler combines space heating and domestic hot water in a single efficient appliance. Advanced controls and building management system integration capabilities make Lochinvar ideal for sophisticated installations.
Lochinvar supports its commercial customer base with exceptional technical resources including in-house engineering support, CAD drawings, specification sheets, and submittal documents for construction projects. The company offers comprehensive training programs for contractors and service technicians through regional centers and online platforms. Warranty coverage reflects commercial-grade construction with terms varying by product line and application. Lochinvar maintains an extensive parts inventory and technical support staff who can assist with commissioning, troubleshooting, and optimization. The company's serial number systems have evolved through nine distinct formats since 1965, each tailored to specific product families, allowing trained technicians to accurately determine manufacturing dates and specifications for proper service and maintenance planning.
Where to find the serial
Lochinvar water heaters and boilers have the rating plate on the side or front of the unit. The serial is typically a long alphanumeric string and is also printed on a separate barcode label inside the access panel. Lochinvar makes both tank and tankless residential units plus a large commercial line.
What the serial actually looks like
Why the age is worth knowing
Lochinvar residential gas units typically carry around a 6-year tank warranty, while commercial units vary and many run far longer in service. Lochinvar's strength is high-efficiency condensing technology - the stainless or copper heat exchanger is usually the most expensive long-term service item (and is covered separately from the tank), so descaling and combustion maintenance pay off significantly.
Quick answers for this brand
How do I tell a Lochinvar water heater from a boiler by the model number?
Look at the model prefix. Water heater families end in W (for example AW ARMOR, EJW residential gas, CW/EW/RW/IW/CF copper-tube, CG/CL commercial gas), while boiler families end in B (for example KB KNIGHT, FB/FTXL CREST, PB POWER-FIN, NKB/NKC NOBLE combi). A boiler heats water for space heating, not domestic hot water, so if your unit is a boiler this tool's water heater results will not apply.
Why won't my newer Lochinvar serial decode?
Lochinvar's newest units use a long 13-digit serial that the company does not publish a public date code for, so it cannot be reliably decoded here. Use the manufacture or production date printed directly on the rating plate instead - it is the most accurate source for those units.
Is Lochinvar mainly for commercial?
Lochinvar has historically been a commercial-leaning brand, especially known for the Knight, Crest, and FTXL boiler series. Their residential line (Squire, Sit-Lo) is smaller but well-regarded. Many residential installations are actually light commercial units sized for large homes.
Is Lochinvar related to A.O. Smith?
Yes - Lochinvar has been owned by A.O. Smith Corporation since 2011 and operates as a separate brand focused on commercial and high-efficiency residential markets. Manufacturing is in Lebanon, Tennessee. The Lochinvar serial format is distinct from A.O. Smith's standard YYWW residential format.
Where do I get parts for a Lochinvar Knight?
Lochinvar parts route through the A.O. Smith commercial distribution network and a strong network of authorized Lochinvar service partners. The factory tech support line (615-889-8900) is the best starting point for older units or unusual model variants.
Time to repair or replace your water heater?
Compare free quotes from top-rated local pros near you.
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