In last month’s article, we looked deep into the pipes of an old two-pipe gravity circulation system. We will now continue looking at the history and advances of these wonderful mechanical systems. In this very same neighborhood near Capitol Hill, I came across a single-pipe gravity system that had its piping pitched upward from the gravity heat source, just like the two-pipe system. However, this system utilized a special fitting called a Eureka fitting. The Eureka tee was ...

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