Danfoss 1.5" Discontinued?

[avc8130]

I haven't played around with my boiler plumbing in a while, and I am looking at adding an undergound run from my basement out to my shop to run a water/air exchanger in the propane furnace out there. With the pipes "open" I was thinking it might be a good idea to add some return water protection.

I started looking for a Danfoss (seems popular around here) and I see they discontinued the 1.5" model. Will 1.25" be ok?

I have 1.5" iron pipe from my supply and return. It necks down to 2 major "trunks":

1. (Future): 1" PEX to/from shop.
2. (Current): 1.5" Cast Iron that tees to 3/4" copper for my indirect and 1" copper continuing to my 5 zone manifold.

I realize the Danfoss needs to wind up between the boiler and EVERYTHING else on both the supply and return so I was hoping to use 1.5".

Will I be ok with the 1.25" they sell?

Here are some pics:

Supply:



Return:


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