Perfex Series 155 Magic Dial Thermostat
Here are photos of a circa-1944 Perfex Series 155 Magic Dial Thermostat, as well as the instruction manual.
District Heating in Denmark Video, Part 2
Here is a fascinating look at Denmark's district heating system in Part 2 of this three-part video series.
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The American Society of Heating and Ventilating Engineers Guide (1929) - Hot Water Heating Systems and Piping
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