Well, so far since we begun carrying the CSP Pumps (we're main UK Stockist afaik) we've had no returns on them whatsoever. Only one that came back for being dead was only dead cos the customer had screwed the barbs in too far and they were physically stopping the rotor... however, the timescale involved is relatively short, and nowhere near long enough for me to draw any conclusions at this time. Towards the end of summer enough time should have passed for any of our customers to have experienced issues along lines of those mentioned here on these forums and rma to me, and I should have some figures of quantity sold vs quantity returned vs period of time between sale & return...
So far tho, over the past... er... 6 years.... returns levels are as follows (over the entire 6 years)
Eheim 1048 returns - 3% of total 1048 stock sold (total sold being towards the thousands to both Watercooling Enthusiasts and aquatics suppliers etc etc)
Eheim 1046 returns - 4% (no longer carried)
Eheim 1250 returns - <1%
Eheim 1260 returns - 0%
DangerDen DD12-D4 / Laing D4 / MCP650 - <0.5%
DangerDen DDC - 0% (so far)
Swiftech MCP600 (original model ? back when it first came out) - 80% (but all repaired and now still running fine afaik)
CSP-750MkII - <0.2%
Hydor L20 - 4% (hence once current stocks run out, ceasing to carry - slowest seller of all pumps)
Hydor L30 - 6% (hence no longer carry)
Think that's all the pumps we've ever carried... other than the first watercooling kits we carried, the Senfu ones, with their integrated pumps. That was more a case of 100% of those sold (3 of em) ended up in the bin when WaterWetter caused the whole pump/res ensemble to split and disintegrate!
Hydors have by far been the worst we've ever had to handle in terms of returns levels. Still recouping the losses now... however, the Hydor failures have all been when used with TEC based systems where coolant temp has been fairly high afaik, but not high enough to warrant killing the pump imo. Certainly 1250s fitted in the same systems are still running fine to this day, after a number of years have passed, as all Hydor L30s that came back to us at that time were replaced with 1250s due to our own lack of confidence in their reliability, and our trust in the reliability/warranty provided by Eheim.
Eheim 1046 and 1048 are what I refer to as "artificially higher" in return rates. This was due to all the returns being at the time when we were Innovatek resellers and the pumps were being run on 8mm ID tubing. I'm putting restriction down as the cause for the high number of failures resulting in noisy impellers and suchlike for those two pumps, but since stopping selling Innovatek products and therefore stopping carrying the 1046, we haven't had a single return on the 1048 since all blocks and hardware carried by our store became wholly 1/2" ID based, altho sales have also dropped dramatically on the 1048 in recent years.
I'm still waiting for our new batch of CSP pumps (the sealless CSP-MAG) to arrive which should be any day now...
However, my figures above MAY be useless, as I can't say how many of our customers have taken advantage of the Direct-to-Eheim 10 year Replacement warranty rather than RMA-ing to us...
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