Here is an item that is used on the TDI forum. One individual has made a kit, with the 1000W, that is specifically for the TDI with all fittings. Put a timer on it and it only needs an hour. What I have copied here is just the heater. I noticed there is also an adapter for MB. Each application would have to search out the proper fittings (probably not much more than $15).

http://www.jcwhitney.com/webapp/wcs/stores/servlet/ProductDisplay?langId=-1&AID=5096982&PID=544008&productId=2473&CJURL=catsubpic_image.jhtml%3FCATID%3D181857&catalogId=10101&storeId=10101