Tool for Solar Thermal System Schematic

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San Francisco, CA

I've started down the road of putting together a drainback system for my house in sunny San Francisco. If you're curious what I'm up to, I'm documenting the process here:

I'm at the point that I'd like to create some system schematics. I *love* the design of the schematics published in Homepower magazine, but I've struck out trying to find the tool HP uses or anything like it. What are you all using? I need to get this ugly, `key free' SRCC OG-300 diagram:

Into something with a proper `Key' and better legibility. Is there a Visio or OmniGraffle set of templates/stencils that are used in the industry?

Thanks in advance!

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