Hmmmmm......
If, according to Cather, the 1250 dumps 9w into the loop and you ran two of them in series... that's 18w being dumped into your loop. I'm too lazy to do the math right now, and I don't know what else is in your loop, but I doubt that that second pump will amount to much more than a .5c degree rise in temperature. Tops. Plus your temperatures might drop with the additional flow. Some people will disagree with me on this next statement: Having a second pump is like RAID 0. If one fails the other will still work. Though statistically speaking the probability of pump failure is doubled, the probability of total loop failure is reduced to half. Food for thought.
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