My 09 Reg Touareg has a diesel heater under the near side front wheel arch. As I understand it this kicks in when the engine is cold; can't reme,ber if it runs alongside the engine, or just runs after you turn the engine off if everything is still cold.
I do know that after a very short run from cold you can get a cloud of fumes out of the near side as this thing fires up.
So - given that at one time you couldn't even fart let alone use a mobile phone in a petrol station without being told you risked an explosion, how does having diesel burning on some kind of metal screen become safe?
Cheers
Dave R