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webmedic · 04-30-2002, 07:01 AM

My above comment was only in regards to the maze2.

Sorry to qualify my post it's not that flow rate does not matter at all. The problem is just as stated above any restriction in the system creates more heat. Also using verry large pumps produce more heat than small ones. There is a point of diminishing returns. Not that larger pumps aren't better in some ways but they also make more heat. There is also a point when a pump is to small. Personnaly I've found pumps in the 130-150 gph to be the best mix of performance verses heat. All the rest is bad design. If you set up your system for max flow the the pump is less of an issue.

That is why I use 1/2 tubing throughout my system and 5/8 fitting. The 1/2 fittings are 1/4 on the inside or 3/8 at best. This restricts flow. Using a heater core over a dd super cube maximizes flow. Having a high flow block with lots of surface area increases flow. I can give many examples.

The important thing is to have max flow in your entire system( good system design ). Not a system that restricts flow ( bad system design ). With a high flow system less heat is produced by the pump and a smaller pump can be used. But even still some of the worst setups I had usually gave temps whithin 2c with different pumps.

Here is were the diminishing returns come in. larger pump = more wattage. Take a look at the ehiem 1250 it's about 28 watts even if all that is not transfered directly to the water it's still allot more than my 130gph pump which is only 6 watts. Also the ehiem has a small hole on the inside that vents water to the inside of the pump around the turning shaft this is how the ehiem is cooled. So the point of submerged or not is also not an issue.

04-30-2002, 07:01 AM	#11
webmedic Cooling Savant Join Date: Dec 2001 Location: Cheney, Wa Posts: 367	My above comment was only in regards to the maze2. Sorry to qualify my post it's not that flow rate does not matter at all. The problem is just as stated above any restriction in the system creates more heat. Also using verry large pumps produce more heat than small ones. There is a point of diminishing returns. Not that larger pumps aren't better in some ways but they also make more heat. There is also a point when a pump is to small. Personnaly I've found pumps in the 130-150 gph to be the best mix of performance verses heat. All the rest is bad design. If you set up your system for max flow the the pump is less of an issue. That is why I use 1/2 tubing throughout my system and 5/8 fitting. The 1/2 fittings are 1/4 on the inside or 3/8 at best. This restricts flow. Using a heater core over a dd super cube maximizes flow. Having a high flow block with lots of surface area increases flow. I can give many examples. The important thing is to have max flow in your entire system( good system design ). Not a system that restricts flow ( bad system design ). With a high flow system less heat is produced by the pump and a smaller pump can be used. But even still some of the worst setups I had usually gave temps whithin 2c with different pumps. Here is were the diminishing returns come in. larger pump = more wattage. Take a look at the ehiem 1250 it's about 28 watts even if all that is not transfered directly to the water it's still allot more than my 130gph pump which is only 6 watts. Also the ehiem has a small hole on the inside that vents water to the inside of the pump around the turning shaft this is how the ehiem is cooled. So the point of submerged or not is also not an issue. __________________ www.water-cool.com Last edited by webmedic; 04-30-2002 at 07:04 AM.