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Abstract: The purpose of this investigation is to further the current discussion of how the Swedish market for district heating can be made more competitive and effective...

Here is a United States Patent assigned to the Thermiser Manufacturing Corporation for a flue box assembly, dated January 30, 1979. "In summary, the present invention pro...

Here are the installation instructions for Minneapolis-Honeywell diaphragm gas valves, dated October 1, 1945. Thanks to Mike Zydiak for sharing this with us.

Here is a United States Patent for McDonnell & Miller's #11 Switch, dated October 28, 1941. Thanks to Gerry Gill for finding and sharing this one. 

Thanks to Gerry Gill for finding and sharing this patent. And thanks to Tim McElwain for these comments about the patent, "It looks like the prototype for what became Hon...

Thanks to Terry Tekushan for finding and sharing this one with us. He writes, "I thought this would be a nice addition to the museum. It goes well with Gerry Gill's submi...

Thanks to Gerry Gill for finding and sharing this patent. He adds, "We got nothin' on the old-timers!"

In London, during 1906, W. J. Connor published this Q&A booklet for those tasked with stoking coal-fired steam boilers.

Here's an interesting cleaning product for coal-fired boilers, circa-1950. Thanks to Michael Keefe Brewer for sharing.

Here is a wonderful explanation of what was involved with caring for a coal-heated home in 1943. (From The New York Times, 1944.)