Vari-Vac Differential Heating System
Here is information from MEPCO (Marshall Engineered Products Co.) about the Vari-Vac Differential Heating System. Thanks to Brad White for finding and sharing this inform...
Heating Museum Help Topics
Take a stroll through HVAC history in our Heating Museum. This section of our website preserves history and answers that so-important question: What the heck is that thing? Whenever you run across anything unusual, chances are you’ll find the old literature about it right here.
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Recent Articles in Heating Museum
Vari-Vac Programmable Timer
This installation, operation, and maintenance manual from Dunham-Bush contains information about the Vari-Vac DTS-2 Programmable Timer. Thanks to Brad White for finding a...
VECO Vapor Heating System
This document contains information about the VECO vapor heating system, the very best offering of the Vapor Engineering Company, circa 1930. It's always a joy to find one...
Webster Systems of Steam Heating
Here's the whole Warren Webster line from 1943, along with some very clear explanations of how their heating system worked. After the catalog material, you will find the ...
What You Should Know About Venting Unit Heaters
This article by Henry H. Aronson about venting unit heaters appeared in Heating, Piping & Air Conditioning magazine. Thanks to T.P.
Wiley Water Seal Radiator Trap Patent
This patent contains the very best description of a water seal trap's role in vapor heating. This is courtesy of Steve Pajek.
A Study of Radiant Baseboard Heating in the I=B=R Research Home
These tests were made during the winters of 1943-44 and 1944-45. The goal was to find a hydronic system that would work well in homes without basements, which were antici...
Bell & Gossett's Air Control Booster Package
Bell & Gossett's Air Control Booster Package was a product that never really took off. The circulator removed the air from the system. This brochure is from 1966.
Bring Comfort and Convenience to Your Home with a Utica Heating System at Reasonable Prices
Here is an informational brochure about the Utica Heating system from The Royal Heating Company that appeared in 1938. Thanks to John Mills for scanning it and sharing it...
Clow & Sons Version of the Heat Generator
Thanks to Steve Pajek for finding this patent issued in 1915. Honeywell was not the only company with a heat generator!