hi there, i have just took delivery of our new to us van, a 2002 swift lifestyle, we are very pleased so far, and just been playing around getting to know how things work. our truma heater is dual fuel running off both gas or electric. this heater also has ducted air heating thru' out. anyway after trying it out in electic mode a few times it seems to take a good 20 to 30 minutes to start warming the caravan thru, is this correct or this there a secret way to get best performance from it, mine has a thermistat on the wall including a switch that goes 500 - 1000 - 2000. I have tryed all 3 settings. also on the heater itself it has a dial with numbers upto 10, and a switch for off - automatic - and on. my dealer told me if using on electric and using either 1000 or 2000 setting to make sure the dial on the heater is on 2 or above. if anyone can give advice as to the best way to use this heater and comment on the length of time it takes to heat up, I would appreciate it. Also is it best to use gas to warm caravan thru 1st then switch to electric? Many Thanks, Andrew.