Guys I know there have been many discussions on here about the 6025 and 6045 being very close in comparison and I without saying you are wrong maybe some info and design has been over looked. Check out this thread that talks about the difference and also talks about the conspiracy theory of the 6025 vs. 6045.
Look at my question--
I have been reading about modding the nanostreams on here. One thing I keep seeing is that people are accusing Tunze as falsely and incorrectly stating the flow of the 6025 vs. 6045. I know there are a lot of idiots out there so I figured I would ask your professional opinion. Here is a quote that started my question "
The fact remains as jacmyoung said earlier.
From day one, we stated that the 6025's flow outperformed the spec of 660GPH, and the 6045's flow performance grossly under performed the 1189 (1100 revised) GPH spec.
For those people that are not interested in modding pumps, the stock 6045 is only pumping ~200GPH more than the stock 6025.
THIS WAS THE ORIGINAL CLAIM AS OF A FEW MONTHS BACK, AND SADLY ENOUGH STILL HOLDS TRUE TODAY.
There are thousands of views of this thread and many hundreds of people own both models. NOT ONE HAS YET TO COME OUT AND DISPUTE jacmyoung's or my flow measurements on either pump.
As I have repeatedly said, the nanostream powerhead is the overall best powerhead in the market today, (based on form, fit, and function); But that doesn't negate the fact that the stock 6045 grossly underperforms the published flow spec even after it was revised to 1100gph.
My earlier $30 comment referred to the flow performance difference on the stock 6025 vs the stock 6045.
The Tunze spec never advertised modding activities, stopper reliability and cleaning frequency requirements to justify the $30 premium. All they said was, it looks the same and pumps 1189 vs 660. The other comments and "benefits" were made and /or "discovered" (if indeed they are true) by us the hobbyist community. So, it's now up to you, the educated consumer to decipher the true data from the marketing fluff.
Enjoy..."
Reference:
http://www.reefcentral.com/forums/s...5&pagenumber=25
And here is my answer:
Chris I received this from Roger.
"John,
The actual flow is 720 and 1100, this is true but it was not due to any deliberate attempt to deceive and I would simply ask the question of how accurate are most pump ratings, we are off by less than 10% which is within German legal requirements. Unfortunately some things change from prototype to final product and any flow calculation on a prop pump is a crude calculation as they don't have the pressure to work with flow meters and the only two methods you can use are dye dispersion or collecting the flow and trying to guestimate head losses (the method we used). That is a nearly 400gph difference and the guy that originally claimed 200gph difference (skydancer) did not take any head pressure into account, he put a pipe on the pump, pumped the water into a bag and calculated it out, the 6025 has a greater head pressure capacity so the flow will be more accurate, the 6045 is much lower pressure flow as the shorter internal tube greatly reduces pressure."
"The fact of the matter is that the mod will give virtually equal flow to a 6045 but it will usually result in more noise and a much longer time before rotation is corrected"
"Generally speaking the 6045 is more stoutly built with stronger tabs to lock on the front cover and more potting over the motor coil so there are differences in build quality outside just flow numbers. Yes, the 6025 and 6045 have the same motor coil and the same impeller, only the physical characteristics of the housing are changed."
Thread where 6025 vs 6045 is compared:
http://www.reefcentral.com/forums/showthread.php?s=&threadid=1035674&highlight=6025+6045
Just thought I would pass on my research I have found, now you have to draw your own conclusions.
Chris