I am installing a Harmon pb-105 using nofossil's simplest pressure design. I will use a Grundfos Alpha or Eco-circ for the zone pump. I am not sure if there is any advantage to using one of them for the boiler circ. The ability to vary speed might be helpful, but the program mode seems useless. Am I missing something?
Circ pump choices
- Thread starter CRIV911
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the big advantage of the Alpha comes when used with a variable load (50%+ reduction in electrical consumption), but it will also use about 30% less electricity even when used in a constant speed/pressure application. So, yes, there is an energy consumption advantage in using the Alpha for both pumps.
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