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.
Condensing Furnaces: Lessons from a Utility
This is a great article from Home Energy Magazine. The author is Jonathan Beers, Residential Services Manager at Madison Gas and Electric Company. We thank him for giving us permission to post it in our Heating Museum.
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The American Society of Heating and Ventilating Engineers Guide (1929) - Hot Water Heating Systems and Piping
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