Wood boiler plumbing/pump

[Burnbabe]

I have searched around and asked how big of a difference is there if I install a wood boiler up hill from the house about 75ft of pipe total .does this effect anything with the returnflowing back up the hill ?
Also has anyone had experience with the Oak tree 300 wood boiler? I can not find information on these.

 

[E Yoder]

If the outdoor boiler is high the air will vent back up to the boiler and you'll have no issues.
If the boiler is a lot lower than the house it can be difficult to purge the air out the first time. It doesn't want to go downhill in an open (no pressure) system.
I think Oaktree is either out of business or not doing much anymore. I'm not sure.

 

[RWS]

As far as a pump, the down hill, cancels out the up hill. No need for a bigger pump.