Diesel heaters; approved by Canadian insurance providers for vans/cars?

Greetings

Good forum so far!

Question about Diesel heaters in vans/cars:

  1. Are they often covered by car/van insurance providers in the event of accidents of any sort OR can they be used to deny you coverage?
  2. I guess diesel heaters need to have some form of government approval, like CSA or related to be covered by insurance providers?