You said you had a heat loss done when you built the house. That number would be a 5 digit BTU amount, which refers to the amount of BTU lost through the walls, ceiling, windows, doors, etc on a "design" day (the coldest day of the year) that needs to be replaced with the furnace. With that number, we would be able to determine your necessary flow rate

I actually found a fairly good price on the 26-99 flanges included for $380 CAD shipped, thats the best I found so far.I will likely go with that and see what happens. Now I have to figure how to connect the pumps at the back.
I will look around and see if anyone has any pictures of what they did.
Thanks again everyone .

HX refers to the hot air heat exchanger. Also knowing the cfm of the blower would get some idea of heat load.
You could also look into a B&G NRF-25, it's a good compromise between the 15-58 and 26-99 at a good price.

Sorry I am new to this. I don't know what you are asking for with the heat loss and HX ?
I am from ON Canada. I can't find those pumps for $150 here. If I order from the US I get nailed big time for duty and brokerage fees. Sometimes more than the price of what I buy. The cheapest I can find here is $298 USD or $398 CAD for the 26-99.
I was offered a Chinese knock off of the 26-99 for $275 but I think I will steer clear of those.

I did plumb in a fill valve in the basement, figured much easier then trying to fill outside in the winter.

I guess I was thinking the recirc pump eliminated the concern about condensing. But anyway, like wreckit said height makes no difference once the air is purged out. Just plumb in a fill valve at the water heater and maybe a hose outlet on the shop loop to use domestic water pressure to purge.
Those eBay 26-99's are a great deal.
Interestingly, I used a 15-58 yesterday on a 130'+ loop. Heated fine with a five ton air handler.

What did the heat loss come back at? What size is your HX? The uphill battle to the garage plays no role in pump sizing, as the return trip will cancel out whatever was lost on the way up. With only 80 feet of Logstor, you should be able to push roughly 6-7 GPM with a 15-58 on high or 8-9 with a 26-99 on low. With a 20 degree delta T, those numbers are linear to BTU output (6 GPM = 60k BTU, 9 GPM = 90k BTU). With a worst case scenario DHW call of 4 GPM, you've got 120,000 BTU there alone to get 50 degree groundwater up to 110 degrees which at 6 GPM would hand you a 40 degree delta. If at the bottom of a cycle with 160 degree supply water, that brings your return down to 120- well below condensing temperatures. Add a simultaneous central heat call, you're flirting with disaster. What I would do, is head over to eBay and buy a 26-99 for $150, likely not much more than your supplier was going to charge for the 15-58, and yield the cheap insurance that your boiler will live a healthy life. As for the garage, same rule applies but will depend again on heat load and HX size to determine necessary flow rate.

I wouldn't imagine he would be willing to take it back if its too small. He is a few hours away from me and i have it shipped here so there is that too.
The loop to the garage is about 50 feet of LogStor to the garage slightly uphill. Then copper up to the ceiling where the air exchanger will hang, about 15 feet to ceiling. Don't think the 15-58 has enough head to push it that far ?

The 15-58 should work fine and will use a lot less power than the 26-99.
Will your supplier exchange it for the 26-99 if it is too small?

What will be in the garage loop?

The Polar G2 does have a recirculation pump..
I am a little afraid of the 15-58 running on high speed and not doing what I need. At that point I have no further to go other then get a bigger pump. I would try the 15-58 if it would work for my garage when I get it insulated but, it has more head than the house so, it won't work there.
The 15-58 is half the cost but I could end up eating it and buying the bigger 26-99 anyway ?
I don't know...

Does the Polar have a recirculation pump? If so it should mix the return water and prevent sweating?  If so I'd do a 15-58 on high speed. The job I'm doing today will use a 15-58, they're great little pumps.