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 patent for the company's boiler return trap. Thanks to Gerry Gill for finding and sharing that one.
This document contains the complete illustrated instructions for installing the Hercules Steam and Hot Water Heating System, a boiler manufactured by Sears, Roebuck and C...
This document contains the manufacturer's instructions for the HB Smith Series M450L Mills Water-Tube Boiler for automatic firing with oil or gas (Steam, Vapor, or Water ...
This document contains the jacket assembly instructions for the HB Smith Series 45 Mills Boiler (circa 1979).