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I am buying a 1250 unused Eheim pump, how much is it worth? 40-60? USD?
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Whenever I get anything used I usually figure about 50-60% of new, possibly 75% if it's a really nice item or is high demand. As I recall an Eheim 1250 is around $70-80 new, so the low end of that range is probably about right. Don't forget to include shipping costs, if any, when calculating the price.
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My case is a bit small on space on the top, but I was thinking the HWLabs Black Ice Pro II Radiator, which is 25mm thick and has 2 120mm fans on it (not included), but with some fans on it it should only be 50mm thick yet perform better than a single 120mm Black Ice Extreme, So do you think this would work good?
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The best value is usually automotive heating cores both for price and cooling performance. Check Airspirit's Heater Core data base to figure out what size you need. However, the pix I've seen of the BI rads look like they use an automotive style design, so they wouldn't be to bad. IMHO the critical things when setting up a rad is that you should NOT just strap the fans to the rad face, instead use a shroud to space the fans AT LEAST ONE INCH off the face of the rad (2" is better) to both improve cooling and reduce noise. Per BillA, fans work better when they 'suck' through the rad instead of trying to 'blow' through it. Last, you should have at least 1-2" of clear space on the other side of the fan as well.
Gooserider