Seisco® Water age

How to determine the date of production/manufacture or age of Seisco® brand Water Heater 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.

Parent Company: A.O. Smith acquired Seisco circa 2017. Seisco branded products were discontinued effective December 15, 2017; however, A.O. Smith is said to honor all Seisco parts and products warranties for as long as they remain in effect.

Subsidiaries: None - See Brand History section below.

The date of production/manufacture or age of Seisco brand Water Heater equipment CANNOT be determined from the serial number located on the rating data plate.

Example serial number styles/formats found:

→Style 1: A602 36471

→Style 1: A602 36471

CAUTION: We have not been able to accurately determine coding for the precise year of manufacture in the serial number. Until such time, only the era of manufacture may be presumed based on the manufacturer of the particular unit.

The serial number in this example is a Microtherm, Inc. style which indicates this unit was manufactured prior to the Microtherm, Inc. liquidation of December 31, 2007 (see data plate image of popular RA28 model below)

Prior to January, 2008 Seisco products were made by Microtherm, Inc.^*

Microtherm, Inc. was liquidated on December 31, 2007^*

SEISCO International Limited was founded January 1, 2008 and became the trademark and patent holder for the SEISCO family of products.^*

A.O. Smith acquired SEISCO circa 2017.^*

SEISCO® History¹

SEISCO no longer in business/discontinued effective December 15, 2017.^*

First U.S. patent recorded in June, 1993, with later patents following in 1999, 2000, 2001, & 2009^*

Prior to January, 2008 Seisco products were made by Microtherm, Inc.^*

Microtherm, Inc. was liquidated on December 31, 2007^*

SEISCO International Limited was founded January 1, 2008 and became the trademark and patent holder for the SEISCO family of products.^*

A.O. Smith acquired SEISCO circa 2017.^*

Despite many apparent accolades from industry sources and special recognition from several government agencies including PATH, HUD, NAHB Research Center, NREL, TVA, DOE, and EPRI, Seisco brand products were discontinued effective December 15, 2017 based on an intra-company news alert post published November 14, 2017 by distributor Hydro Pump Co. ⁽¹⁾ , and no longer available per distributor PlumbingSupply.com ⁽²⁾^*

A.O. Smith will honor Seisco parts and product warranties for as long as they are in effect.^*** (10-year limited/prorated warranty on residential products, and 5-year limited/prorated warranty on commercial products.) ⁽³⁾^*

The Seisco website (seisco.com) remains published and accessible^**; however, Technical, Service, & Sales inquiry emails listed on the company website are currently directed to A.O. Smith points of contact (@hotwater.com)^*

Google maps search indicates company listed physical address as "Permanently Closed" ^*

_{^* Information reasonably believed accurate based on extensive research conducted 10/03/2022.}

_{^** as of 10/03/2022}

^{*** _{According to Hydro Pump Co. website posting (https://www.hydropump.net/seisco-brand-products-to-be-discontinued-as-of-december-15-2017/)}}

^{(1) _{https://www.hydropump.net/seisco-brand-products-to-be-discontinued-as-of-december-15-2017/}}

^{(2) _{https://www.plumbingsupply.com/seiscotankless.html}}

^{(3) _{https://www.seisco.com/warranty-info}}

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

Page last updated: 08/28/2023

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