We installed a Webasto gas heater under the seat in our '21 Sprinter van. Lots of work, kind of kicked my behind to be honest. This video shows how we did it.
Here is a link to the Heatso site. They were very helpful with the controller install and cabling. They also warranted the defective heater that I bought on Amazon.
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![](https://i.ytimg.com/vi/v795bENuCcA/mqdefault.jpg)