Here is the deal. Willing to accept reasonable offers on this (at least $300).
You are looking at a 24volt Webasto Thermo 50 (thermo 50 is US MIL-spec) it is basically the same as a Thermo C but the documentaion on the source of materials is different... This is a engine and cabin preheater (you need to be able to understand relays to make this work right).
There is exactly zero hours on this. What is missing is the fuel pump and the wiring harness. These parts are available on the market. I used to work in a R&D division of a company and I ordered this one and a 12 volt (guess where the 12 volt one is).
Please visit www.parkingheater.com
to see how the system works.
THIS IS A 24 VOLT MODEL AND CANNOT BE "CONVERTED" TO 12 VOLT. If you have two batteries and some diodes you can get creative...
Here is an auction for the fuel pump: http://cgi.ebay.com/WEBASTO-24-V-FUE...item3cb3b51d28
Here is an auction for the harness:
I do have the Defender specific install instructions (you will need to brush up on your German for that one... Please ask all questions up front prior to commiting.