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[cdie]

Finances made me buy  used and found a glenwood 1250 boiler with +/- 50' of 1" Pipe snaking thru firebox and 9 gal tank on top of unit.  Installing in a shed 10' from the house. 20' of crawlspace and 15' more to the  oil boiler.  Unit has 2 3/4" inlets and a n 1 1/4" outlet.. existing boiler  is 1 pump with 2 zone valves. 1 is 15' from pump, other is35'.  What size line from boiler to boiler? Do i need to pump from b to b?  Thanks

[LittleJohn]

I would look at your BTU requirement and what 3/4", 1" and 1.25" are each capable of.  I personally would run as large of line as I could get and afford, and run that between the 2 boilers. 

In regards to the statement about pump(s), not sure exactly how your system is setup, but you will need something to move the water 

[slimjim]

Have you thought about proper, non powered dump zones and adding more expansion tank, if not you are begging for trouble!

[userdk]

Your local glenwood dealer would probably best be able and willing to help you.
Good Luck!!!