These are also very good - as far as we can tell. We've had one in our VW for the last 2 years. I've had cause to contact their customer services (for information/advice, not as a result of any defect in the heater) and replies were prompt and helpful. They appear to be well supported with spares/consumables on the website.
I’ve had a Chinese heater (£80 back then) in my camper since 2018 and it’s been faultless. If I needed to replace it I’d go Autoterm based on their reputation. I wouldn’t touch anything secondhand even Webasto.