Thanks for the reply Cathar
I agree since we're not that far off room now. I wasn't totally clear in my thought process but, I was thinking a little beyond the block and more toward what the actual physical limit of heat transfer really is with water and a given solid. As copper is more efficient than many other metals water has a given ability to absorb energy. I was just figuring what ever that was is as close to "theoretically" perfect a water system could be. I usually keep my wandering thoughts to myself but I wanted a little input on this one
And others may differ with you Cathar but who cares, I would assume those to be more the "engineering" type. I feel there's good engineers and good "constructors" or "implementers". You seem to be the version I respect most, a little of both, you know how to make it work and HOW it works