I use this pump and I have used it for 5 years. Last week I took it apart to check the impeller because it came with a spare,but the impeller was fine. It runs great.
http://www.northerntool.com/shop/tools/product_200352045_200352045
I pump from the hot outlet of the water heater not the drain valve. No problems.
Great pump, self priming, got a pile of them. Just don't let it touch the bottom, or you better have a screwdriver at ready. Good way to get the water out of the house.
THEN get out the shop vac and SUCK the junk out. If you dont rod and root around thru the drain hole, all the s&*^ is still in the bottom.
This is awkward, but...
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