Hello,
I've installed this unit to 4 campervans already and are happy with it. Tried 2, 5 and 8 kw versions. 2kw unit is sufficient to keep the RV van heated and can run entire night. With 5kw unit, you get the cosy temeprature witinh few minutes, but I would recommend to turn the heating off after max 1 hour. The new version has way better control unit.