The curve of diminishing returns is actually much lower down, around 1.5-2 Liters/minute. Between 2 and 4l/m you have a difference of 1-2c. Above 4 l/m it will be 1c or less and the pump heat will outweigh it.

If you are getting 1.5gpm! (6 liters/minute) then the extra flow is not free, it costs heat into your loop, you should turn the pump down.


You have heatkiller as a high flow block, when its one of the more restrictive.

Also for tubing, you have this which I think is wrong:
1/4" & 5/16" are all but extinct at this point. There is still equipment available that uses them, but it's mostly to fix old loops.
Its true they are not used much, but this will change as blocks are getting far more restrictive with FAR higher pressure pumps, the tubing size has became *compleatly* irrelevant for most people. It makes very little difference to temperature but its used for compatability.

So with 1/2", you might gain 1-3c at most, but you will have to use large fittings, 90degree bends and it will take up most of your case.

1/4" small fittings, you can do 360 degrees in the space of a 1/2" fitting. you can g-clamp the hose if you want to disconnect something without draining, and it will take less space than aircooling.


Quote Originally Posted by MpG
a faster flowrate can help minimize the effect of earlier components heating the water for later components.
The water is already moving so fast that the dT is under 0.5c.. so that is compleatly wrong.