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Blackeagle · 02-22-2003, 05:05 AM

Yeah, you got it. A Eheim 1250 is good, a Iwaki MD-15R is high performance & MD-20rzt is about the most powerfull of reasonable pumps. Anything bigger is not only a waste but will often give worse performance as the larger pump adds more heat to the water.

A Eheim 1250 = 317gph with a potential head of 6.5 ft.

A Iwaki MD-15R = 300gph with a potential head of 11.1 ft. This is a very good one.

A Iwaki MD-20rzt =175gph with potential head of 23 ft. If you can handle the cost and demand the last possible C then enjoy.

Note how the pump with the lowest gph rate will give the highest system flow and lowest temps. While the 1250 with the highest flow rating will have the lowest system flow and poorest cooling, due to it's lower pressure.

But the price differance between the 1250 and the MD-15R stiff. The Eheim is a good pump at the price. Iwaki's are one of the very best pumps so the MD-15 is also a good value when you cnsider the differance in pressure rate and the quality of build. The MD20 can deleiver even higher preformance, but at even higher prices.

1250 = $65

MD-15 = $120

MD-20 = $160

The biggest problem with the MD-20 rzt is the size of it. many cases don't have room for it.

02-22-2003, 05:05 AM	#15
Blackeagle Thermophile Join Date: Oct 2002 Location: U.S.A = Michigan Posts: 1,243	Yeah, you got it. A Eheim 1250 is good, a Iwaki MD-15R is high performance & MD-20rzt is about the most powerfull of reasonable pumps. Anything bigger is not only a waste but will often give worse performance as the larger pump adds more heat to the water. A Eheim 1250 = 317gph with a potential head of 6.5 ft. A Iwaki MD-15R = 300gph with a potential head of 11.1 ft. This is a very good one. A Iwaki MD-20rzt =175gph with potential head of 23 ft. If you can handle the cost and demand the last possible C then enjoy. Note how the pump with the lowest gph rate will give the highest system flow and lowest temps. While the 1250 with the highest flow rating will have the lowest system flow and poorest cooling, due to it's lower pressure. But the price differance between the 1250 and the MD-15R stiff. The Eheim is a good pump at the price. Iwaki's are one of the very best pumps so the MD-15 is also a good value when you cnsider the differance in pressure rate and the quality of build. The MD20 can deleiver even higher preformance, but at even higher prices. 1250 = $65 MD-15 = $120 MD-20 = $160 The biggest problem with the MD-20 rzt is the size of it. many cases don't have room for it. Last edited by Blackeagle; 02-22-2003 at 05:35 AM.