Yep, I've got the webasto just like Atoine. Installed similarly too. It's a fantastic heater. Just got back from a week long camping trip down to the north coast and back. Even in my uninsulated cargo it's fantastic and more than ample even in moderately cold weather. We had quite a few 24-30 degree nights and the front living space area of my medium roof lwb cargo was easily 65 degrees or greater. Only insulation is the interior package coroplast style wall liners and custom insulated window coverings. Bare ceiling and lots of exposed bare metal. Still will probably do a bit of insulation so it's not running continuous all night, but totally sufficient for an uninsulated van in all but the coldest temps.
Even running at full tilt consumption is around 1 gallon every 15 hours or so. My 105ah deep cycle agm house battery is sufficient to run the heater and Engel fridge, plus some interior lighting, USB charging, etc. On the coldest nights running full tilt all night we'd go from about 12.8V to 12.1V over the course of 15+ hours. Most nights (Mid 30s) we only ran down to around 12.3V.
Highly recommended. Drives out moisture, keeps condensation down or non-existent, makes winter camping fun.
