Mixing pumps in series?

[windwind]

Anything bad can happen if I using 2 different pumps in series? I have a Eheim 1048 already and now want more flowrate for better cooling. Here's what in my mind now:


1. Get another 1048 (expensive...)
2. Get Hydor L20 (cost only 1/3 of 1048, similar performance as 1048)
3. Get Hydro L30 (cost only 2/3 of 1048 and performs like 1250)

Currently my wc setup (all 1/2" ID) is:

1048 -> DD heatercore -> DD clear res -> Maze4 -> Maze4GPU -> 1048

I shall upgrade maze4 to cascade once available (cathar are you here? :D )

Your opinion much appreciated. :)

[Ven0m]

Rather not, but if they are different, check flow of that more powerful under load - if it's lower than that worse pump on zero load, U can link pumps.

Remember that pumps will produce heat and heat will go to water.

In most cases it's better to buy one good pump and sell old to someone.

[Raider84]

also why are you going from the heatercore to the res? all that does is slow the water down, and its not going to help cooling any. I would put the res right before the pump.

[squeakygeek]

It doesn't matter where he puts the heatercore, the water will not move any faster. He probably has the heatercore right after the pump so the heat from the pump is dispersed before it gets to the hot components.

[windwind]

Originally posted by Ven0m
Rather not, but if they are different, check flow of that more powerful under load - if it's lower than that worse pump on zero load, U can link pumps.

Remember that pumps will produce heat and heat will go to water.

In most cases it's better to buy one good pump and sell old to someone.

I get it. :) If the more powerful one is pushing more water at load than the weaker one at idle, power is lost the weaker one.

In case of aquarium pumps like Eheim and Hydor, they are pathetically weak in pressure. Max flowrate is seldom reached in typical watercooling setup. To my understand, 2 pumps in series double the head. In this sense I think two 1048 in series is better than one 1250. Am I right?

[windwind]

Originally posted by squeakygeek
It doesn't matter where he puts the heatercore, the water will not move any faster. He probably has the heatercore right after the pump so the heat from the pump is dispersed before it gets to the hot components.

I have the same reasoning. Arrangement of any watercooling componets will not have any effect on overall waterflow. I put res after radiator just to minimize water resistance cause by tubing.

Anyway I'll try T-line later.

[Ven0m]

Maybe these 2 would be better, but they would rather also produce more heat.

Personally, I've bought submersible garden fountain/cascade pump - 2000lph, 3m, relatively silent, about $30.