Nice View of Heat Exchanger

This was from yesterdays inspection. It’s nice when there is an easy to remove door and you can see right in. This cast iron beauty was still pumping out the heat. Was unable to tell the year.
xxth Century Zeph Air Gas Furnace
Model GZ series s1-123
Serial# ss8478

Hi Bobby,

that appears to be a mid 60’s model number 1965-1967 to be specific.



It may work but it is wasting energy. Tell clients to have an energy audit performed.