Age of lochinvar water heater

Copper-Fin II® Water Heaters. In 1993, Lochinvar introduced the first horizontal chassis, copper-finned tube water heater with fan-assisted combustion. 9 Models from 400,000 – 2,070,000 Btu/hr. 85% thermal efficiency. 4:1 Turndown Ratio. Gasketless Copper-Finned Tube Heat Exchanger. SMART SYSTEM™ Operating Control with a Built-in Cascade ...

Age of lochinvar water heater. Enter the 7-digit CP/Serial Number of the boiler to obtain the manufacturing date and any associated information on the product. If the CP# is only 6 digits, enter a leading zero, e.g. 0137718. This look-up will not give manufacturing information for any other Weil-McLain product but boilers.

One of the critical things you need to know in order to properly size a tankless water heater is the temperature rise. If the incoming water is 50°F and you have your tankless set to heat the water to 110°F, the temperature rise will be 60°F. If you live in the Northern Region the ground temperature is much cooler than in the Southern Region.

You're reviewing: Lochinvar, Gas Water Heater, 40 Gallon, Residential, Tall, 40,000 BTU's Your Rating. Rating. 1 star 2 stars 3 stars 4 stars 5 stars. Nickname. Summary. Review. Submit Review. Contact Information. 972-503-4535 [email protected] WWCSupply.com 5100 TX-276 Royse City, TX 75189 United States.We are a leading producer of energy-efficient water heating solutions that are radically simple, brilliantly engineered and perfectly suited for most any application. We focus solely on serving the unique needs of each customer with a product portfolio including boilers, water heaters, pool heaters, cogeneration products and commercial package ...LIMITED RESIDENTIAL WATER HEATER WARRANTY ... and component parts for leak age or other mal func tion ... Lochinvar, LLC. • 300 Maddox Simpson Pkwy • Lebanon, TN ... The water heater is equipped with 3/4 inch NPT water temperature - pressure relief valve by the manufacturer. connections. Page 13: Gas Piping serving the water heater, and • A drip leg (sediment trap) ahead of the gas control valve to help prevent dirt and foreign materials from entering the gas control valve.Style 3: 05.05 -000021. Every effort is undertaken to offer you correct and concise information to assist you in determining the age or manufacture date of water heating equipment. Anytime anyone is dealing with numbers and letters in determining data, mistakes and misinterpretation are bound to happen.We are a leading producer of energy-efficient water heating solutions that are radically simple, brilliantly engineered and perfectly suited for most any application. We focus solely on serving the unique needs of each customer with a product portfolio including boilers, water heaters, pool heaters, cogeneration products and commercial package systems.

You can get replacement parts on amazon if you need them. Click here → https://goo.gl/iSGf5jSome old water heaters will need to be lit with a match. The onl...How to determine Water Heater and Furnace Age Maintained by send suggestions to [email protected] Page 1 Water Heaters: Ambassador – See State American- 1st two digits equal the year, next two the week. ACE – See American or State AO Smith- 2nd letter (sometimes first i.e. Kenmore and GSW) equals the month and the next two digitsLIMITED RESIDENTIAL WATER HEATER WARRANTY ... and component parts for leak age or other mal func tion caused by defects in materials and/or work man ship. It ex tends to the first owner as long as the water heater ... Lochinvar, LLC. • 300 Maddox Simpson Pkwy • Lebanon, TN 37090 • 615-889-8900 / Fax: ...May 6, 2007 · I can not find the reference to determine the age of a Lochinvar Water Heater. SN is BH6479275 and the MN is DVN051. Any help would be much appreciated. Beginning in 1973, Lochinvar started using a letter year followed by a letter month, excluding certain letters. Letter years: A - 1973 B - 1974 C - 1975 D - 1976 E - 1977 F - 1978 G - 1979 H ... For instance, in serial number 9010-2008–114-1014, the water heater was made on the 14th day of January in 2008. This guide should help you determine the age of your water heater based on its brand and serial number. Always remember to consult with a professional if you have any doubts or concerns about the condition of your water heater.Patterson-Kelley Will Be Attending The 2023 AHR Expo! Read More. Contact Patterson-Kelley. Patterson-Kelley manufactures and sells a full-line of high-efficiency commercial boilers and water heaters for commercial applications.

LOCHINVAR KNIGHT HEATING BOILER SERVICE MANUAL [PDF] (2010) Models 80-285, Starting Serial #H07H10040039; Lochinvar Knight HEATING BOILER MANUAL [PDF] Models 80-500 ; LOCHINVAR NOBLE FIRE-TUBE COMBI BOILER PRODUCT DESCRIPTION [PDF] LOCHINVAR RB/RW BOILER & WATER HEATER MANUAL …The Squire uses the power and efficiency of the boiler that heats the home to generate domestic hot water for showers, dishwashing, clothes washing, etc. 17 Models : Capacities from 30 - 119 Gallons. 316L Stainless Steel Coil and Tank. Fully Welded Construction. Dent Resistant Jacket.It’s just very, very rare. Lochinvar Water Heater Age Chart Locate the serial number on your Lochinvar water heater and check the first letter. Match the letter to the chart below and you will decode your water heater’s age by the year of manufacturing. Let’s check out a real Lochinvar Water Heater label below.Lochinvar uses adenine 20-letter roll letter code the age their water heaters. The initial letter in one serial number denotes the price the unit was manufactured, and the second briefe is the month it what made.[Click to enlarge any image] This page provides manuals and age information for Lochinvar water heaters. If you are looking for manuals for Lochinvar heating boilers for building heating, see LOCHINVAR HEATING BOILERS Currently Lochinvar electric water heaters are produced in Mexico for Lochinvar, LLC, Lebanon TN, USATips to estimate the age without a serial number. Brand Histories. Brand info that may help determine an age or era. Select one of the drop-down lists below. that corresponds to the 1st letter. of your HVAC brand name. Then make your selection from the Brand Names list. HVAC - A.

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This natural gas water heater comes with a 3-inch water vet with an overall rating of 95% AFUE. According to the manufacturer, this product can deliver 4.8 gallons of heated water per minute. Additionally, it comes with a 10:1 turndown ratio making its heating capacity just ideal for residential use.The Serial Numbers shown are utilized with all Lochinvar Brand systems of Boilers, Water Heaters, Pool Heaters, etc. Style 1: KJ-1000130 Style 2: 1142N012345Dec 5, 2019 · Lochinvar KMA050KD: Design and features. This 4,500-watt, 240-volt hot water heater uses two copper-sheathed, zinc-coated heating elements inside that are designed to resist corrosion. In addition, the steel tank has a glass lining to protect the tank from rust. This water heater also comes with a brass drain valve built for durability. The date of production/manufacture or age of M. M. HEDGES® Water Heater(s) can be determined from the serial number. Serial number styles/formats found are: ... Lochinvar bears the same serial number style. Every effort is undertaken to offer you correct and concise information to assist you in determining the age or manufacture date of water ...

Water Heaters • Hot water recover rates from 76-1760 l/hr • 75-400 storage capacity • Fast recovery water heaters ... 77 to 1760 litres/hour based upon a temperature rise of 50°C …Water heaters in general have an average estimated useful service life of 10-12 years, though water quality, routine upkeep/maintenance, and location of the water heater will all play critical roles in the longevity of these systems. See also: Estimated Useful Service Life ExpectanciesJune 18, 2020. Lochinvar has recalled almost 38,000 Lochinvar, A.O. Smith, and State ProLine residential condensing boilers, combination boilers, and packaged systems sold between August 2016 and ...Sep 3, 2023 · The date of production/manufacture or age of Knight (Lochinvar) brand Water Heater & Boiler equipment can be determined from the serial number located on the rating data plate. The multiple Serial Number styles shown were utilized with all Lochinvar Brand systems of Boilers, Water Heaters, Pool Heaters, etc. - but typically with specific model ... Serial Number #1E-123456 (used in 1970’s) 1 = 1971 E = May. Serial Number #P16-12ABCD (used in 1983) P = 1999 16 = week. Serial Number #03161-ABCDE (used in 2002-2009) 03 = 2003 16 = week 1 = day. Serial Number #1604-12345A (used in 2010-present) 16 = 2016 04 = week This Trane serial number style is still used in any Trane …0V line to terminal 16. A link wire must not be connected to terminals 57 & 58 when 0 – 10V control is used. The Lochinvar TTW water heater has a built in cascade management system. When two or more water heaters are connected in a cascade, each water heater of the cascade has to be connected to the next water heater using terminals 61 &...Find an A. O. Smith replacement water heater. This tool will provide you the best match for your current brand and model. *Product data and claims used to match products and display within this tool are subject to change without notice. Some product dimensions may have changed due to NAECA regulations. Always review manufacture product data and ... The data plate on your GE water heater should be located along the top of the tank. If your water heater is less than 20 years old, a manufacturing date will likely be printed on this label along with the model and serial number. The manufacturing date should look something like this MFG. Date: 04/2008.Apr 7, 2023 · It’s just very, very rare. Lochinvar Water Heater Age Chart Locate the serial number on your Lochinvar water heater and check the first letter. Match the letter to the chart below and you will decode your water heater’s age by the year of manufacturing. Let’s check out a real Lochinvar Water Heater label below.

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Lochinvar water heater age. Lochinvar is another manufacturer that uses letters to represent years and months. The company’s water heater serial numbers begin with two letters, the first of which represents the year and the second of which represents the month. Here is the key for the years: P = 2017; N = 2016; M = 2015;The Serial Numbers shown are utilized with all Lochinvar Brand systems of Boilers, Water Heaters, Pool Heaters, etc. Style 1: KJ-1000130. Style 2: 1142N012345. Style 3: J-93001. Style 4: A07H00123456. Style 5: J93-1030F.Sep 11, 2018 · You have to use your own judgement of the condition of the water heater to determine which year is correct. Knowing when the house was built is also helpful. A = 1964, 1984, 2004 B = 1965, 1985, 2005 C = 1966, 1986, 2006. D = 1967, 1987, 2007 E = 1968, 1988, 2008 F = 1969, 1989, 2009. View and Download Lochinvar RESIDENTIAL GAS WATER HEATERS use and care manual with installation instructions online. RESIDENTIAL GAS WATER HEATERS. RESIDENTIAL GAS WATER HEATERS water heater pdf manual download. Also for: Fvir.Brand Histories. Brand info that may help determine an age or era. WH Brands - A. WH Brands - B. WH Brands - C. WH Brands - D. WH Brands - E. WH Brands - F. WH Brands - G.3. Decode the label by finding out (chart below) how that brand of water heater documents the manufacturing date within the serial number on the label. Water heater manufacturers document the month and year or year and week of manufacturing as part of the serial numbers on the water heater. Check this chart to find the brand water heater you ...Lochinvar uses adenine 20-letter roll letter code the age their water heaters. The initial letter in one serial number denotes the price the unit was manufactured, and the second briefe is the month it what made.Coleman®. How to determine the date of production/manufacture or age of Coleman® HVAC Systems. The date of production/manufacture or age of Coleman® HVAC equipment can be determined from the serial number located on the data plate. Parent Company: York.3. Decode the label by finding out (chart below) how that brand of water heater documents the manufacturing date within the serial number on the label. Water heater manufacturers document the month and year or year and week of manufacturing as part of the serial numbers on the water heater. Check this chart to find the brand water heater you ...

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Sep 11, 2018 · You have to use your own judgement of the condition of the water heater to determine which year is correct. Knowing when the house was built is also helpful. A = 1964, 1984, 2004 B = 1965, 1985, 2005 C = 1966, 1986, 2006. D = 1967, 1987, 2007 E = 1968, 1988, 2008 F = 1969, 1989, 2009. Jul 28, 2017 · The date of production/manufacture or age of Lochinvar® HVAC equipment can be determined from the serial number located on the data plate. Parent Company: Lochinvar. Example serial number styles/formats found: The Serial Numbers shown are utilized with all Lochinvar Brand systems of Boilers, Water Heaters, Pool Heaters, etc. HotWaterSolutionsNW.org. It might be difficult to predict how long your water heater will survive – depending on the type and fuel source, its lifespan could be anywhere from 8 and 20 years.The typical traditional electric water heater has a lifespan of 10–15 years and is covered by a normal six-year guarantee.If you are unsure of the age of your …For nearly 80 years, Lochinvar, an American company, has been a leader of innovation and high-efficiency water heating. Through Lochinvar's pride in leadership and commitment …The date of production/manufacture or age of FTXL (Lochinvar) brand Water Heater & Boiler equipment can be determined from the serial number located on the rating data plate. The multiple Serial Number styles shown were utilized with all Lochinvar Brand systems of Boilers, Water Heaters, Pool Heaters, etc. - but typically with specific model or ...Lochinvar produces innovative water heating products with smart system controls that can also be controlled via CON·X·US Remote Connect. This smart technology lets you control your boilers, water heaters from any corner of the world. Lochinvar’s products have extremely low energy emissions and these produce very little harmful waste.About Lochinvar. For nearly 80 years, Lochinvar, an American company, has been a leader of innovation and high-efficiency water heating. Through Lochinvar's pride in leadership and commitment to excellence, the company has continually improved year after year. Today, Lochinvar touts the broadest line of high-efficiency water heating solutions ...manufactured water heaters for nearly 50 different brands. American was acquired by A.O. Smith in 2001 and currently only manufactures American, ... Lochinvar Energy Saver . Golden Knight . Knight : Rheem . Rheem . 0794***** (July 1994) or. 0794F***** (July 1994) Rheem uses a 2-digit month followed by a 2-digit year .Sep 3, 2023 · How to determine the date of production/manufacture or age of Noble ® (Lochinvar) brand Water Heater & Boiler Systems.. Water heaters in general have an average estimated useful service life of 10-12 years, though water quality, routine upkeep/maintenance, and location of the water heater will all play critical roles in the longevity of these systems. Shield 150,000 to 500,000 Btu/hr Models. 96 % Thermal Efficiency for Life. The SHIELD commercial water heater delivers best-in-class innovation from Lochinvar. It operates at 96% thermal efficiency, with inputs up to 500,000 Btu/hr, and provides a 100% effective defense against a water heaters worst enemylime scale buildup inside the tank. ….

This company is known for its high quality electric tankless water heaters and its tankless gas water heaters, and rating plates on models from this company are easy to decipher. With a Rheem water heater, once you have located the rating plate, you need to find the serial number, which will be made up of 10 numbers and letters.Find an A. O. Smith replacement water heater. This tool will provide you the best match for your current brand and model. *Product data and claims used to match products and display within this tool are subject to change without notice. Some product dimensions may have changed due to NAECA regulations. Always review manufacture product data and ...The Squire uses the power and efficiency of the boiler that heats the home to generate domestic hot water for showers, dishwashing, clothes washing, etc. 17 Models : Capacities from 30 - 119 Gallons. 316L Stainless Steel Coil and Tank. Fully Welded Construction. Dent Resistant Jacket.Lochinvar has unveiled a new range of high temperature R290, air-to-water heat …. In response to high demand for heat pump systems Lochinvar has taken …. As a result of the credit crunch Lochinvar have noticed a marked …. 2023 sees the launch of the Amicus AquaStore, the UK’s most powerful ….Lochinvar uses adenine 20-letter roll letter code the age their water heaters. The initial letter in one serial number denotes the price the unit was manufactured, and the second briefe is the month it what made.How to Determine Water Heater Age . Maintained by send suggestions to scott@HonestHomeInspections. com Page 5 Updated 10/17/2008 Updated 1/6/2009 Updated 1/23/2009 Updated 2/12/2009 Updated 5/5/2010 . Scott C. LeMarr has provided his file of keys to decode Water Heater Age from the data provided on the manufacturer's …LOCHINVAR KNIGHT HEATING BOILER SERVICE MANUAL [PDF] (2010) Models 80-285, Starting Serial #H07H10040039; Lochinvar Knight HEATING BOILER MANUAL [PDF] Models 80-500 ; LOCHINVAR NOBLE FIRE-TUBE COMBI BOILER PRODUCT DESCRIPTION [PDF] LOCHINVAR RB/RW BOILER & WATER HEATER MANUAL …For instance, in serial number 9010-2008–114-1014, the water heater was made on the 14th day of January in 2008. This guide should help you determine the age of your water heater based on its brand and serial number. Always remember to consult with a professional if you have any doubts or concerns about the condition of your water heater.These models feature a quiet, efficient blower for outstanding power-vent operation. Power Vented Models from 40 to 75 Gallons. Gas Inputs from 40,000 to 76,000 Btu/hr. Glass Lined Steel Tank with Protective Anode Rod. Sidewall Vent with PVC, CPVC or Polypropylene. Age of lochinvar water heater, Leaks: If your water heater is leaking, it must be replaced immediately. Leaks are usually the result of pressure buildup inside the tank. This happens when the water pressure or temperature is too high, or when the unit’s relief valve is not working properly. Neglecting a leak can lead to a tank explosion. Signs of leaks include moisture or ..., You're reviewing: Lochinvar, Electric Water Heater, 40 Gallon, Residential, Tall, 4500W Your Rating. Rating. 1 star 2 stars 3 stars 4 stars 5 stars. Nickname. Summary. Review. Submit Review. Contact Information. 972-503-4535 [email protected] WWCSupply.com 5100 TX-276 Royse City, TX 75189 United States., I have a Lochinvar hot water heater it is 4 1/2 years old. 65 gallon. I had the temperature control panel Intelli Vent -White Rodgers replaced 4 months ago. It keeps flipping onto vacation mode/warm(l ..., The date of production/manufacture or age of DAIKIN® HVAC equipment can be determined from the serial number or MFG. DATE located on the data plate. Parent Company: DAIKIN North America LLC (Subsidiary of Daikin Global aka Daikin Industries, Ltd.) Style 1: Serial No. A000129 with MFG. DATE 2008-1., How to determine Water Heater and Furnace Age Maintained by send suggestions to [email protected] Page 1 Water Heaters: Ambassador – See State American- 1st two digits equal the year, next two the week. ACE – See American or State AO Smith- 2nd letter (sometimes first i.e. Kenmore and GSW) equals the month and the next two digits , To age your Daikin equipment, find the serial number that is printed just below the model number on the data plate. The first two digits are the year the equipment was made, and the second two digits are the month. This is the same as aging Goodman HVAC equipment. In the example below the serial number is 1705282056., To read a Lochinvar boiler serial number, you will need to note the series model of the boiler and the year of manufacture. The serial number should include a combination of numbers and letters, either in 6, 7, 8, 10, or 12 character formats. For 6 digits, the final two indicate the year of manufacture. In some cases, the year of manufacture is ..., The Lochinvar® Charger gas fired, tank type water heaters are designed to provide ease of installation, low stand-by loss and years of trouble free service. ... Lochinvar® Gas Water Heater, Multi-Flue Charger, Series: CGN, 199999 Btu/hr Heating, Natural Gas, 1/2 in Gas Connection, 100 gal Tank, Spark Ignition, ..., Lochinvar SIT119 Squire 113 Gallon Residential Indirect Water Heater - 5 Year Warranty; 5635.82 3945.07; 113 Gallons; SIT119, Mar 15, 2018 · 3. Decode the label by finding out (chart below) how that brand of water heater documents the manufacturing date within the serial number on the label. Water heater manufacturers document the month and year or year and week of manufacturing as part of the serial numbers on the water heater. Check this chart to find the brand water heater you ... , How to determine the date of production/manufacture or age of Lochinvar ® brand Water Heater & Boiler Systems. Water heaters in general have an average estimated useful service life of 10-12 years, though water quality, routine upkeep/maintenance, and location of the water heater will all play critical roles in the longevity of these systems., Tips to estimate the age without a serial number. Brand Histories. Brand info that may help determine an age or era. Select one of the drop-down lists below. that corresponds to the 1st letter. of your HVAC brand name. Then make your selection from the …, I have a Lochinvar hot water heater it is 4 1/2 years old. 65 gallon. I had the temperature control panel Intelli Vent -White Rodgers replaced 4 months ago. It keeps flipping onto vacation mode/warm(l ..., The Serial Numbers shown are utilized with all Lochinvar Brand systems of Boilers, Water Heaters, Pool Heaters, etc. Style 1: KJ-1000130. Style 2: 1142N012345. Style 3: J-93001. Style 4: A07H00123456. Style 5: J93-1030F., 100057228. 100057228 LOCHINVAR CONTROL BOARD GEN,1,ELEM,ON-OFF. Qty ea. Price: $360.14 / ea. Log In for Availability Add to Cart. compare. 100063315. 100063315 LOCHINVAR 4.5KW 240V - 3.75KW 208V SCREW IN ELEMENT 13-1/2IN LONG OLD# ELE1408 ELE1408K 100142494. Qty ea., Oct 24, 2021 · When a tank-style water heater approaches 8 to 10 years of age, or a tankless water heater approaches 15 to 18 years of age, it’s time to start thinking about replacing it. , Whether replacing an old water heater or putting the water heater in a new location, the following critical points must be observed: 1. Select a location indoors as close as practical or centralized to the water piping system as possible. The water heater should be located in an area not subject to freezing temperatures. 2. , It’s designed for good results, and can hold a lot of liquid and water. And it costs a lot. A lochinvar water heater lasts about 5 years before it starts to make a …, The date of production/manufacture or age of M. M. HEDGES® Water Heater(s) can be determined from the serial number. Serial number styles/formats found are: ... Lochinvar bears the same serial number style. Every effort is undertaken to offer you correct and concise information to assist you in determining the age or manufacture date of water ..., Serial Number #1E-123456 (used in 1970’s) 1 = 1971 E = May. Serial Number #P16-12ABCD (used in 1983) P = 1999 16 = week. Serial Number #03161-ABCDE (used in 2002-2009) 03 = 2003 16 = week 1 = day. Serial Number #1604-12345A (used in 2010-present) 16 = 2016 04 = week This Trane serial number style is still used in any Trane and American ..., The age of your Lochinvar water heater is found on the ID plate. Some models have the manufacture date clearly printed on the plate near the model and serial numbers. If your model does not have the date clearly printed, it will be found in the serial number., Brand Histories. Brand info that may help determine an age or era. WH Brands - A. WH Brands - B. WH Brands - C. WH Brands - D. WH Brands - E. WH Brands - F. WH Brands - G. , Date: 04/2008īelow is an image of a GE Water Heater data plate. The manufacturing date should look something like this MFG. If your water heater is less than 20 years old, a manufacturing date will likely be printed on this label along with the model and serial number. The data plate on your GE water heater should be located along the top of ..., Sep 19, 2023 · Lochinvar, a leading manufacturer in the industry, offers a wide range of water heaters known for their durability, efficiency, and performance. In this comprehensive guide, we will delve into the world of Lochinvar water heaters, exploring their features, benefits, and how to determine their age. So, let's dive in and discover why Lochinvar is ... , Lochinvar GTN05040 Energy Saver Tall Natural Gas Water Heater, 50 GAL, 40000 BTU/HR. Can't find a product? Call now! 888-756-4110 Cart (0) Items Can't ... Energy Saver Residential Tall Gas Water Heater, Capacity: 50 GAL, Natural Gas Fuel, 40000 BTU/HR BTU Rating, Material: Glass-Lined Steel Tank, First Hour Recovery: 88 GAL, Recovery: ..., Rinnai is one of the most trusted brands when it comes to gas appliances, especially water heaters. However, like any other appliance, it can break down and will need professional attention., The Lochinvar® Charger gas fired, tank type water heaters are designed to provide ease of installation, low stand-by loss and years of trouble free service. ... Lochinvar® Gas Water Heater, Multi-Flue Charger, Series: CGN, 199999 Btu/hr Heating, Natural Gas, 1/2 in Gas Connection, 100 gal Tank, Spark Ignition, ..., Energy saver indirect water heater. Squire indirect water heater. Lochinvar’s 30-50 series is an advanced series of gas hot water heaters, offering you value and an …, Feb 5, 2022 · To age your Daikin equipment, find the serial number that is printed just below the model number on the data plate. The first two digits are the year the equipment was made, and the second two digits are the month. This is the same as aging Goodman HVAC equipment. In the example below the serial number is 1705282056. , The date of production/manufacture or age of WaterFurnace® HVAC equipment can be determined from the serial number located on the data plate. Parent Company: WaterFurnace International. Example serial number styles/formats found: Style 1: UJ1087. Style 2: D8367019. Style 3: 180100228. Back to Brand Listing., 11. All residential tank-type water heater parts have a six (6) year warranty from the date of purchase. 12. All commercial boiler, water heater and pool heater parts have a one (1) year warranty from date of purchase. All residential boiler parts have a two (2) year warranty from date of purchase. 13., HVAC systems are designed to last a certain number of years, typically 10-15 years for a residential system. Knowing the age of your system can help you determine when it may be time to replace it. It can also help you plan for maintenance and repairs, as older systems may require more frequent repairs and maintenance to keep them running ..., Lochinvar Brands Energy Saver Golden Knight Knight Lochinvar uses a 20-letter code for the year of manufacture of their water heaters. The first letter of the serial number is the one to use. The letters I, O, Q, R, U and V are excluded. Because the letter code recycles every 20 years “A,” for example, can be 1964, 1984, 2004.