Had a home with hot water heat this weekend. The unit simply had GRUNDFOS and “number” A8318. It said it was type UP26-64F. Can anyone help with age on this unit? Thank you. I’m putting a photo on as well.
The circulator is certainly a Grundfos. You say the heating unit said Grundfos as well? Reason I ask, is because all your numbers are for a Grundfos 1/12 horsepower universal pump. 
Thanks…let me look at my notes again.
It was a LONG day yesterday.
That is an A O Smith Burkay Copper Coil Gas boiler.
http://www.lakesidesupply.com/pdfs/Steam%20and%20Hot%20Water.pdf
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{edit} Sorry, I guess you were asking about the pump, not the boiler.