diesel heater

I bought an all in one diesel heater for my campervan because I thought it would be easier than installing one myself. Now that I have it, I have read online that they are not actually good for campervans because supposedly they are prone to leaking carbon monoxide. Obviously I'd like to not die...

My T5.1 Caravelle Exec has these labels in the drivers door jam. I know the Webasto one is for the pre-heater, there’s a control panel for it up by the rear view mirror that I’ve never used but I know is there. As far as I can work out, this kicks in itself when the temp is low to help get...