help choosing correct pump for heating system

4 Nov 2008
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West Midlands
United Kingdom
I need to replace the pump in my central heating, my current pump is a grundfos 15-50, I have decided upon a grundfos alpha+. They do a 15-50 and a 15-60, I guess I want the 15-50 again but what is the differance? The specs for flow rate and power consumption are the same.

Any advice would be of great help
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a 15/50 is a 5m head pump, a 15/60 is a 6m head pump. If your heating worked fine with the old 15/50 then fit another 15/50. :LOL:

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