Super Hot® Water Heaters

How to determine the date of production/manufacture or age of Super Hot® Water Heater Systems.

The date of production/manufacture or age of Super Hot® Hot Water equipment can be determined from the serial number located on the data plate.

Example serial number styles/formats found:
  • Style 1:     85-ASE-2083
  • Style 2:    MLJC-9724
Style 1:  85-ASE-2083

Year of manufacture is 1st & 2nd numerical digits

Pre-2000 style

Style 2:  MLJC-9724 (4 letters followed by 4 numbers)

Manufactured in 2000 and later

The 1st letter identifies the boiler model type,

The 2nd letter is the month A=1 (Jan) B=2 (Feb) C=3 (March) D=4 (April) etc,

The 3rd letter is the decade A=2010-19 B=2020-29 J=2000-09

The 4th letter is the year of the decade A=1 (2011) B=2 (2012) C=3 (2013) etc.

In this example “M” is boiler model, “L”=12 (December), “J”=0 decade (2000) and “C”=3rd year of decade (2003) Date of Manufacture for this example is December 2003.

Page last updated: 3 Oct 2022