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Right circulator for secondary circuit?

So as I continue to ponder the re-engineer of my ca1991 gravity conversion, I will probably have my Grundfos UP15-42F as a "spare" and it will coincidentally already be installed on the correct side of the boiler perfect for a circulator for a secondary pump circuit... which seems to be highly recommended in Dan's books for this type of application.

Now, my boiler, which is a gas fired Carrier(rebranded Dunkirk PWB-8D), doesn't show any specs that I can find stating a minimum flow or similar stats regarding maintaining temp or flow through the boiler for optimum effeciency or protecting against thermal shock. So I don't even know what would be ideal circulator stats for this application.

So here's my question: Would the Grundfos be fine to use as the secondary circulator pump in this application? I wouldn't want to use it if in such a short loop it could overstress the boiler, or in some other way be inappropriate. But I thought if I already had it lying around, and it was already installed in the right place, why not use it if it would be a good fit.

Just a DIY'er trying to learn, and improve and maintain his converted ca 1929 overhead gravity hot water system since there is no one local that can.
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