The Bosch Greentherm C950ES and C1050ES models can be vented with PVC, CPVC, PP and ABS. The Greentherm units can be vented with 2", 3" or 4" diameter material. Below are the distances of the length of the exhaust runs. Please refer to the installation manual for restrictions and clearances.
For further questions on venting and combustion air requirements please refer to the installation manual that comes with the unit or please call Global Pro Tankless Supply at 866-289-4652.