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Burning Plastic Smell PEX Hot water heat

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Recently installed baseboard hot water heat in my basement on separate zone from the rest of the house.  When I turn the basement zone on a few times a week, I always get a burning plastic smell once the water is flowing and the room is warming.  I used the special 3/4" PEX for hot water heating.  Smell does really bother me just concerned there may be safety issues?  Please let me know if anyone know if this is normal?
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