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New install baseboard heating zone

I have an energy kinetics system 2000 oil burner boiler. I have two available zones. In doing the initial piping can a mix of hydronic plastics and copper tubing be used together to make the runs to each of the fin type heating elements in each room?
Is it safe to run the copper connecting tubes inside of an interior wall ( wood studs and drywall), or will that create a fire hazard?