Pro/Forums - View Single Post - Iwaki RD-20 and RD-30

phide · 04-06-2006, 01:56 PM

Hey, wonderful find! For clarification... the heat generated by the RD-20 is about 28 watts, while the RD-30 puts out about 45 watts (this is strictly motor output, not inline heat dump). In typical Iwaki fashion, some motor heat is expended by the casing (slight for RD series pumps, maybe 4-7%?), so with an RD-20, you're looking at ~24 watts of total heat dump. An MCP655 outputs roughly 24 watts with nearly all of that being inline heat dump.

I think the RD-20 is a more advisable choice even if you have a very effective radiator considering the specifications of the RD-30 and its heat output.

I'm buying one unless I've missed out.

EDIT: According to Stew, "Basically measured that around 83% of the pump's power draw gets passed into the water during in-line use" for an RD-30.

04-06-2006, 01:56 PM	#2
phide Cooling Neophyte Join Date: Feb 2006 Location: Los Angeles, CA Posts: 41	Re: Iwaki RD-20 and RD-30 Hey, wonderful find! For clarification... the heat generated by the RD-20 is about 28 watts, while the RD-30 puts out about 45 watts (this is strictly motor output, not inline heat dump). In typical Iwaki fashion, some motor heat is expended by the casing (slight for RD series pumps, maybe 4-7%?), so with an RD-20, you're looking at ~24 watts of total heat dump. An MCP655 outputs roughly 24 watts with nearly all of that being inline heat dump. I think the RD-20 is a more advisable choice even if you have a very effective radiator considering the specifications of the RD-30 and its heat output. I'm buying one unless I've missed out. EDIT: According to Stew, "Basically measured that around 83% of the pump's power draw gets passed into the water during in-line use" for an RD-30. Last edited by phide; 04-06-2006 at 02:04 PM.