Thank you for your question.
The Bohemia X 40 stove is manufactured for use in the UK and has passed tests for Defra approval to burn wood in smoke control areas. The manufacturers have not had this stove tested for use in the USA.
I can tell you that the X40 has Carbon Monoxide emissions of 0.14% when burning wood and 0.33% when burning smokeless coal, however I am not familiar with the rules for EPA or State of California.
Hope this helps?