JANITROL – Date of Manufacture Request

Sometime back in November 2015 we received a request to “Help in determining the Date of Manufacture” of this old Janitrol Unit from Dave G. out of Colorado.  Here is a sampling of our determination, along with photo’s.

The Original Request:

Janitrol Garage/Hanger space heater.  Possibly pre-1965.  NAT. gas 7″ output vent, 175K BTU input, 140K BTU output, 110

V/3.4A – It has been running great, but I just lost the Honeywell 120V (magnetic) gas solenoid, I was able to find a modern replacement though. – Curious as to its age.  It has a Wagner fan motor.  Everything looks original.  I added limit switches to it almost 30 years ago.




Our Reply:

This model and serial appears to pre-date any of our resources for Janitrol.  However….Thank you for the great photos!

Unfortunately we cannot place a precise date of manufacture on your unit. However, we can narrow down to an era which predates 1963.  Minneapolis-Honeywell officially changed their name to “Honeywell Inc.” in 1963.  Because the magnetic gas valve bears the name “Minneapolis-Honeywell” and the fact the data labels on the unit/components bear “OHIO” and “MINN” rather than the 2-letter state abbreviations also indicate pre-1963 manufacture. The Wagner Electric Corporation motor also appears to predate this company’s acquisitions which occurred in the mid 1960’s when they first were acquired by Tungsten-Sol Electric, Inc. and later merged the next year with Studebaker Corporation.  The Wagner brand is now only known for its automotive lighting and brake components under the Federal-Mogul Motorparts group.

If we had to narrow down further, we’d estimate manufacture between late 1940’s to 1963.   Some of our sources indicate that the 2nd-3rd digits of early Janitrol serial numbers represent year of manufacture, but this has not been confirmed and should not be considered reliable.


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