Venting Requirements for the New Bosch Greentherm T9900 & T9800 Condensing Tankless Water Heaters

Global Protankless Supply is now carrying the New Bosch Greentherm T9900 & T9800 Condensing Tankless Water Heaters.  This is to cover the venting requirements for the indoor model heaters.  The Bosch T9900 & T9800 models can be vented horizontally out the sidewall of the home or vertically through the roof.  The venting connection and intake hole is on top of the unit and is 2" diameter.  The Bosch Greentherm T9900 & T9800 series heaters can be vented using 2", 3" or 4" PVC, CPVC, PP or ABS.  

The minimum exhaust pipe length is 1 ft (0.3m) of straight vent pipe. The minimum air intake pipe length is 1 ft or one 90° elbow or an air intake grill cap to prevent debris from falling into the appliance.

See the table below for maximum exhaust and intake lengths:

Please call Global Protankless Supply at 866-289-4652 for further questions or to place an order.

Venting for Bosch Greentherm C950ES/C1050ES Tankless Water Heaters

This is to explain the venting requirements for the Bosch Greentherm C950ES and Greentherm C1050ES tankless water heaters.  The Bosch Greentherm C950ES and C1050ES are direct vent units and can vent out the sidewall of the home or up through the roof.  The Greentherm units cannot be vented into an existing chimney unless there is nothing else venting into the chimney and that the vent pipe runs all the way up the chimney to a specified rain cap.

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.