Easy to assemble, i did not even refer to the manual. Well, watched a lot of YouTube videos before buying it.I used it in my roof top tent when I went winter camping, it was -6C outside and i slept in shorts and shirt while it was at its lowest setting.I plugged it on my truck's 12V outlet and ran the heater for 12 hours. It did not drain the battery. Used about 2.5L of diesel.Worth every penny!