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Pump Q

G

gpfreek

Limp Gawd
Joined
May 2, 2001
Messages
141
It seems a lot of people swear by Eheim and with good reason. I use one on my 125 gallon tank. But I also understand that when it comes to watercooling max head is the important number rather than GPH. Quiet One Pump 4000HH A 13 Ft head for the same price as Danger Den has for the Eheim 1260. The downside is the inlet/outlet size would need to be reduced to 1/2".
Since this will be my first foray into watercooling, would this be a suitable pump? It will be used with a Black Ice Extreme II, CPU block, Video Card and chipset block.
 
I haven't been reading the forums much but I fail to see how a higher head pressure is going to cool more then mass flow.

The more mass flowing through the system, the more energy you can carry away.
The head pressure is needed because of the valves and length of tubing. If it's to low you won't be able to get the water through the system because of the energy loss at the joints and turns.

So I guess I kind of see the reasoning behind your statement, but in reality it's just to maintain the mass flow through a complex system.

god, i'm letting my classes influence me in the real world
 
You need high head (pressure) in a WC setup that has has either a) many blocks b) restrictive blocks or c) both. For instance a 500 GPH pump will not perform well if it has a 6'' head, because it lacks the force necessary to pump liquid through restrictions (such as tubing, blocks, radiators, etc. A 185 GPH pump with 15 ft head, for instance (this is close to the stats of the swiftech MCP 600, a very good pump), would do very well.

You have to realize that the GPH rating is taken at 0'' head, meaning there is no resistance when that quantity is measured. Likewise, head is measured at 0 gph. That is why it is useful to look at the graphs of the curves generated by the pump manufacturers when deciding to purchase a pump.

I hope this helped.
 
The 13 feet of head on that pump is nice, the 120 watts it uses isn't. The extra heat the pump puts into the loop could a bigger problem than the benefits of high flow rates. I'd get the more energy efficient Laing D4 or MCP600.
 
pentair aquatics switched the design of the Quiet One pumps when they bought out Rainbow - the new 4000HH is supposed to be the direct replacement for the original Quiet One but the specs don't match up. The wattage and heat dump do not match either --- the 4000HH is rated at 120watts where the original design was an 87w pump. Also, the original RLQO had an isolated wet rotor chamber that kept a decent amount of the 87watts from getting dumped into your coolant. I have not had the chance to pull apart one of the new 4000HH pumps but "isolated wet rotor chamber" is not mentioned in any of the information I have been able to find for it so I suspect that is no longer a feature on the new Quiet One pumps.

Out of the new lot of Quiet One pumps, I think the 3000 shows the most promise - it has a 10.5ft max head (same as the non-HH 4000), 780gph @ 0' head and it is 40w.

Otherwise, I'd try to track down a pre-pentair Quiet One - this chart shows the original design RLQO against the Mag3 and the mcp600:
pchart.jpg


If you can find a new one, I suspect it will be at least $100 if not more. It seems they have become a bit of a sought after item by Rainbow pump fans.
 
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