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thanks tony, the old pump I'm taking off is a TWO-SPEED GRUNDFOS SUPER 4, and I think the type is [4-50/130], Hz is[50] and W is [105], which don't mean a lot to me. would you recomend the 15/60 over the 15/50. [/b]

I am about to replace my heating pump. all i know is the old pump is a grundfos. (about 25years old) could someone tell me the difference between the grundfos 15/50 and the 15/60 pumps, also are the grundfos alpha range worth the extra cost, thanks