Systems Help Center

The Imico System was a rare vapor heating system. "There is no air valve at the radiators in this system and no trap on the return end of the individual radiator. Vacuum ...

The In-Air-Rid Vent is one of the finest steam-heating products ever made. In this patent, L.M. Stadelhofer says of his radiator and air valve, "My invention relates to n...

Here is a very clear explanation of how bucket traps work, what goes wrong, and how to avoid problems. Austin Roche, Hoffman Specialty's Chief Engineer, wrote this in Mar...

Unfortunately we don't have a source for this article called "It's All in the Venting" by John Schulz, but it's probably one of the best articles we've ever read on air v...

This book is from the Johnson Vapor Heating Company in Boston, MA. It is not dated, but is most likely from the very early 20th Century. Thanks to Brian Reynolds for shar...

Johnson Vapor Heating Systems was of the more obscure systems from the Turn of the Century. This bulletin from Johnson Vapor Heating Co. outlines how the system works.

Here are circa-1909 patents for H.K & I.Z. Kriebel's air and vacuum controlling device, as well as their system of steam heating and air and vacuum controlling device, au...

This document outlines the Marsh System of Vapor Heating from JAS. P. Marsh Corporation of Chicago.

This circa-1940 patent is for McDonnell & Miller's 101-A Automatic Feeder. Thanks to Gerry Gill for finding and sharing this patent.

MEPCO Steam Traps were widely used on the Dunham-Bush Vari-Vac system. Thanks to Brad White for sharing this information with us.