Thanks for the comments Max. The unit you picked was a bit larger than we are doing now. They are running 4 1/4" on the taller ones and down to 3 3/4" with diameter at 2"+. We will have some 3 1/2 and under soon. I put a 'mini' heatport in a little 'shroom piece yesterday and still have almost a half inch to play with. That one is 3 3/4" tall. The mini heatport is exactly the same as the regular but the outer sleeve is shortened, squeezing the bottom air space in the heatport. They seem to function just as well as the longer heatport.
The big story on function is a new transformer buy. We have used the Jameco 10081 forever. Output 12 volts, 1 amp AC. We are trying the same transformer only DC output. Same 12 volt, 1 amp(1000ma) output only direct current(DC). I do believe there is a difference in heat produced. I have asked the question several times regarding heat produced by AC vs DC with all other outputs the same. Never did get an answer that I can remember but it has always been nagging me as read something somewhere about the difference. Then it was clear two of our competitors were using DC transformers so I gave it a whirl. Buying 100 at a time as we do was a big risk because shipping them back would cost plenty. They are over 30% heavier than the old transformer. That's gotta be a good thing except for shipping. Our Zap packages will still stay under 2 pounds, a very good thing. Shipping transformers stand alone will increase in price but not Zap packages.
I think they run slightly hotter on DC. (Jameco 100870 is the new part number)
This AM I watched our grid go from 117 to 124, down to 121, then 120, then 119. 123 right now. Heat will vary noticeably with that much change. Our battery back-up for the PC and all has a digital volt read out of power at the plug.
Nice vid NYC, thanks much.