NTI® Boiler and Water Heater age

How to determine the date of production/manufacture or age of NTI® brand Hydronic Systems.

The industry average service design life for most forced air furnaces is 15-20 years, and the industry average service design life for most air conditioning condensing units is 10-15 years. The average service design life of boilers can vary from as little as 10 years to as many as 50 years depending on the type and quality of materials used in their manufacture. Routine upkeep/maintenance, regional weather/climate, and location/placement of the mechanical systems will all play critical roles in the longevity of these systems.

Parent Company: Ariston

Subsidiaries or other related brands: Ariston | HTP | American Standard Water Heaters

The date of production/manufacture or age of NTI® brand systems can usually be determined from the serial number located on the rating data plate.

Example serial number styles/formats found:

Style 1: 2103302238194208 (2011 - 2022)
Style 2: 3253087U4221610000082 (2021 - current)
Style 3: 22033999 (Trin & Stor models only)
Style 4: 09Ti-21647 (certain discontinued models prior to 2010)

Legend: Year is RED; Month is GREEN; Day is BLUE

Style 1: 2103302238194208

Ignore preceding 2-digits if 16 digits or in parenthesis

Year of manufacture can be determined by using the 5^th and 6^th digits of the serial number

Month of manufacturer can be determined by using the 1^st and 2^nd digits of the serial number

Day (of month) of manufacture can be determined by using the 3^rd and 4^th digits of the serial number

Note: This format used from 2011 through 2022

Style 2: 3253087U4221610000082

This style is always 21 characters in length. The date codes precede the last 7 digits that usually begin with several leading zeros (denotes unique product number made on a single day of production).

Year of manufacture can be determined by using the 10^th and 11^th digits of the serial number

Calendar day of the year can be determined by using the 12^th thru 14^th digits of the serial number

Note: This style used since September 2021

Style 3: 22033999 (Trin & Stor models only)

This style used with Trin & Stor indirect (passive storage tank) models only.

Year of manufacture can be determined by using the 1^st and 2^nd digits of the serial number

Style 3: 09Ti-21647 (Prior to 2010 models only)

This style used with certain models (now discontinued) manufactured prior to 2010.

Year of manufacture can be determined by using the 1^st and 2^nd digits of the serial number

For other discontinued models including TX, FTV, TFT, LX, and FTG - you must contact NTI technical support for assistance in determining the age of manufacture.

NTI® History¹

1967 - Malcolm Dennison founds company as NY Thermal Inc. in Quebec, Canada. Originally manufactured steel fireplaces.
2016 - Ariston Thermo of Milan, Italy, acquired controlling interest of NTI. The acquisition was publicly announced in September of 2016.

¹Excerpts from various industry sources

Every effort is undertaken to offer you correct and concise information to assist you in determining the age or manufacture date of HVAC/R equipment. Users relying on this information do so at their own risk.

Page last updated: 02/21/2025

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