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Hydronic systems diagrams for teaching sought.

JohnNY Member Posts: 3,232
Hello all,
I'm looking for a diagram of a multi-floor, multi or single-zone circulating hot water heating system. I'm going to use it to illustrate how a system works so it would need to show some critical valves and pumps but not be overly detailed.
I know I can make something myself but I'm thinking this must already exist in many forms already.
Thanks for any help.
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