so 5 years since to give any update on this....sorry.
This thing called "life" gets in the way and changes priorities, desires, ideas, and such.
I started working on the bus again after all these years and I will be installing the heat finally this winter, plus many other things.
After re-reading the thread there is one question I need an answer to.
The engine coolant temp goes up to like 200F and which is more than what is recommended for pex I believe, so should I be using a diverter valve to mix cool water on the heating loop?
When driving in summer to avoid water flow by osmosis should I install a valve at the "out" of the heat exchanger to avoid flow?
in your diagram @somewhereinusa I do not see any diverter valves or maybe you control this by hand?
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