I don't own Tunze yet, but was planning on getting the 6100. I know the only difference between the 6000 and 6100 is just the transformer. Now I want to use the 6000 on the current system and have capability to upgrade to 6100 on a larger system in the future. Can I just get the 6100 and remove the transformer to use it as 6000 for now, or would I be missing something? If this is do-able, I rather buy 6100 than to get the 6000 and add the transformer to make it 6100.