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These heaters do not produce CO, they produce CO2 (Carbon Dioxide). CO poising is not an issue, oxygen deprivation is.

http://www.chemistry.wustl.edu/~edudev/LabTutorials/CourseTutorials/Tutorials/AirQuality/CatalyticConverter.htm

2CO + O2 → CO2(1) CxHy + O2 → CO2 + H2O(2) 2NO → N2 + O2(3)