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.
The Stack Heater Company No-Tank
After moving the gravity-hot-water-system expansion tank from the attic to the basement, The Stack Heater Company introduced a heating system that didn't need a tank at all. Not the best idea to come along, but an interesting relic of heating history.
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