I am installing a Central Boiler Outdoor wood furnace, the furnace
cycles water to the house through a heat exchanger then back to the
furnace to be heated again.

The pump to circulate the water has a 3/4" inlet and outlet, the heat
exchanger also has a 3/4" in and outlet and is also reduced to 1/2"
inside the exchanger.

The instructions recommend 1" Pex piping rated 100 PSI at 180F, this
furnace can be installed up to 500' from the house. Here are a few
questions I have.

1)Would you think 3/4" pipe would work I am going to install it about
100' from the house?
2)I think if I were going to be 500' away I would then want the 1"???
3)But because of the restriction of the pump and exchange 1" may be
over kill as it costs 2 to 3x more?
4)Is there any reason I can't use CPVC piping? It is also rated 100PSI
at 180F?

Pro's of Pex pipe:
1)The only connection/joints are at the pump and exchanger.

Con's of Pex pipe:
1)Very difficult to install and work with a 200' roll of pipe, it also
needs to be threaded through 8' insulation tubes.
2)Connectors are harder to find and a crimp tool is needed.

Pro's of CPVC pipe:
1)Easy to thread through the insulation
2)Many connectors available all cement together.

Con's of CPVC pipe:
1)Each 10' piece will need to be cemented together more joints.

Thanks for any and all help,

John