We inherited an old house with a Wards coal “octopus” gravity furnace that has been converted to gas. It is on an old mercury switch thermostat (not digital) and is run to a thermocouple booted onto a light socket in our basement. I want to know if there is a way to convert it to a thermopile so we will have no interruption in our heating during power outages. I am not interested in updating. I know the efficiency issues. We will be working on ways to mitigate those as much as possible in order to preserve the historicity of our home.
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