Not sure if I have a similar issue or not. Got one fitted this week, tried it out today, so set controller to 24C to se what it could do (heat reading from controller thermostat). Air temperature in the van was reading 11C, after 15 mins we had got up to 14C, 30 mins 16C, 1 hour 19C and by 1hr 30mins only up to 20C. From what I'd read, seen on vids, etc. the heater should make the van really toasty quite quickly. Is the above sound normal or are my expectations too high?