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Ddc-1 / ddc-2 / ddc-3

post #1 of 2
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What is the literal difference from each model? Do they have different PCBs? Different motors or encasings?

Are DDC-1s too outdated to be recommended? Do they perform too poorly or inefficiently?
I was thinking about buying two DDC-1 MCP350s from a member here on OCN for $35 each to run in a line; is that a bad idea? If I did buy them, could I do this mod to turn them into DDC-1 355s?
Or should I just stick to a DDC-3.1 (modded into a 3.2) and then possibly buy one at a sooner date?
Would an extra $40 justify the difference from 2x DDC-1s to 2x DDC-3.2s?
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post #2 of 2
DDC1 is the old 10w black impeller
DDC3.15 is the new blue/orange 10w

DDD2 is the old 18W orange impeller
DDC3.25 is the new blue/orange 18W

There are some differences in performance, but they are generally minor enough that hydraulically you can consider them the same. Actually the orange DDC2 was one of the most powerful, but there was too many burning up.

They are however very different pcbs and different impellers. Newer models are less buzzy and more quiet. I also don't think you can modify a ddc1 to a DDC2 like you can the ddc3.1 to 3.2. Newer models also have voltage min/max protection, soft start, and different rpm scaling.

You can however install the DIYINHK pcb mods in the DDC1s. The Sanyo version will give you a small boost in performance with much improved noise similar to the newer pumps. The Toshiba version will also give you more performance and you can add on a speed controller but it's not silent like the Sanyo version

The pumps are an amazing value, but they are a bit more buzzy than the current generation. If you don't like the noise you could swap out the pcb for the Sanyo DIYINHK controller and get DDC3 like noise too.
    
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