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It probably is an emitter image. Lol. I just picked whatever clip art I could find that looked like the parts I needed. If I drew them it would have been comical. Thanks for responding.

The red loop is potable water that flows through a plate heat exchanger in one direction. The heat exchanger is in about the middle of my drawing. The purple loop is a closed loop heating system filled with antifreeze that flows through the same heat exchanger from the opposite direction. The...

Agreed. There is a heat exchanger to create a closed loop heat system. However, the original plumber engineered an auto refill, which I suspect, creates a stagnant water spot even if working correctly. I think that such engineering can be done better, but I’m not sure if having an auto refill...

Thanks. I suspected that the flap traps were less aggressive but wanted to be sure since I don't regularly deal with hydronic heat systems. The fact that the old system was plumbed non-standard to begin with also caused me concern. Right now, I'm leaning toward just returning the warm water to...

Thanks! I appreciate your insight about those heat trap nipples. I also appreciate the tip about adding that hose fitting. I assumed that I had Propylene Glycol in the system because it was clear, but I could be wrong. For all I know, this thing could have been replacing water in the closed loop...

Hi gang. I'm proactively replacing my 21 year old Lochinvar (giddy up). I have attached an image of my current hot water and hydronic floor heat setup. Basically, the original installer mixed a top discharge with a side return instead of doing both at the top or both on the side. It really is an...