At Easter on our first trip, we needed to use the heating at night. I don't know what is wrong but on electric the vents at the bottom end of the van seem to be blowing out luke warm air (even on full) but when we used gas it seemed hotter. Also the heater Truma ultraheat has a fan - do you always need to use the fan or can you use it as a convector heater. Also there are 3 settings 500w 1000w or 2000w when we used the 2000w we tripped the electrics. Can anyone explain the most effective way of using this heater. Thankyou.