i have a 2021 weinsberg 650 meg a class, made by the knaus mob and similar to the knaus of the same numbers, during a cold spell while the van was on hook up i noticed the floor was slightly warm and my electricity bill climbed significantly, i suspect some form of underfloor heating. it was not spec,d from new, but then not all features it has are. how do i track this down, if it has underfloor heating or not. as a for instance if you order from new ( radio ready) its extra money, but the van arrives with this regardless, are they cute at charging for extras that are fitted anyway with a one size fits all ideology. sorry if i appear thick but i am not very digital or eletrical minded