Around 110 feet and prob six feet at highest point a 18x16 heat exhcanger and a 10 plate for hw
and a 80k tube exchanger for hot tub with 8 90's
That 10 plate is gonna hurt ya. There pretty restrictive.
Yeah, no way an Alpha will work with a 10 plate. A 10 plate is equivalent to adding 270' of 1" pex. At 6 GPM it is about 11' of head pressure loss.
A 20 plate is equivalent to somewhere around 120' of 1" pex and a 30 plate is equivalent to about 45' of 1"
Each elbow is equivalent to about 10' of pex.
So, going with these numbers, you have 110' (assuming round trip) + 270' + 80' (elbows)= 460' and once you add up the rest of the system it is probably close to 500' total. With these numbers I calculate that an Alpha pump will a about 4-1/4 GPM.
If you get an alpha, I would upgrade to a 30 plate or put the 10 plate on a secondary loop and another pump just for it.
Going with a 30 plate would get you 6 GPM with an Alpha. Putting the 10 plate on a secondary loop with another pump would get you a little more than that.