Bosch Tankless Water Heaters Used for Solar Thermal Applications

Certain models of the Bosch tankless water heaters are approved and designed for using Solar Thermal. Solar Thermal applications should be set up in conjunction with an indirect tank to maintain a more consistent temperature but the heater can be used for direct solar preheated water.  The maximum temperature for the solar preheated water into the Bosch tankless water heater is 140 degrees F.  The Bosch tankless water heaters that are approved for Solar preheated water are listed below:

Bosch Therm 830ES
Bosch Therm 940ES
Bosch Greentherm C950ES
Bosch Greentherm C1050ES
Bosch Therm C1210ES
Bosch Therm C1210ESC

Bosch Greentherm C1050ES & C950ES Venting Limitations

The Bosch Greentherm C1050ES and the Bosch Greentherm C950ES gas tankless water heaters have minimum and maximum venting lengths for the exhaust and intake air.  Please review the specifications below for the two heaters and the size, material and lengths that can be used.

Vent options
The Greentherm C1050ES & C950ES must comply with the following material for exhaust and intake air.

PP common vent
PP twin pipe
PVC schedule 40 ANSI/ASTM D1785
PVC-DWV ANSI/ASTM D2665
CPVC schedule 40 ANSI/ASTM F441
ABS-DWV schedule ANSI/ASTM D2661

The Greentherm C1050ES & C950ES have many different ways they can vent such as horizontal or vertical and can use different types of material for venting and intake air.  There is the Polypropylene up and out concentric vent kit, Polypropylene common vent system if you are cascading more than one unit and up to 4 units, PVC Concentric vent kit, you can do a twin pipe PVC vent, etc.

Maximum vent lengths for exhaust, intake air and use of elbows  for the Greentherm C1050ES & C950ES are listed below: