Bosch Tankless Water Heaters with New Built-In External Water Filters

Bosch Thermotechnology is always improving the gas-fired tankless water heaters and has recently improved all the sealed combustion tankless water heaters and have added a new hydraulic block on the bottom of all the units that incorporates a new built in external water filter.

The Bosch Greentherm C950ES and Bosch Greentherm C1050ES condensing heaters were designed with the new hydraulic block and external water filter built in.  The Bosch Therm C1210ES/ESC, Bosch 940ES and the Bosch 830ES have recently had the new hydraulic block and external water filter added.  After Serial number beginning with "301" will have the built in external water filter.

Built-in External Water Filter

All of the older Bosch "Therm" models before serial number 301 had the external water filter, part #8703035356 and was sold as an accessory.

Please contact Global Protankless Supply with any questions at 866-289-4652.

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:

New Greentherm PP Concentric up and out vent kit

New for the Bosch Greentherm C 950 ES & C 1050 ES is the polypropylene concentric up-and-out venting kit consisting of the appliance adapter, a 90° elbow, and a termination. This is the simplest and quickest venting option possible for a condensing tankless unit. The outer metal pipe and the inner polypropylene pipe make it both lightweight and rigid. The termination is telescopic to allow for varying wall thicknesses.

This new PP concentric up and out vent kit is approved for the New Green Therm C950ES & C1050ES tankless water heaters.  The PP concentric up and out vent kit is also approved for the Bosch Therm C950ES & C1050ES.  

Before attaching the appliance adapter to the top of the heater, a second metal plate comes with the kit and would cover the other intake air hole.  Then you would want to remove the exhaust collar from the top middle of the heater and then attach the appliance adapter as this will enable the heater to exhaust to the outside and also take its combustion air down the outer side of the same hole.

Bosch Greentherm PP concentric up and out vent kit (7738003210)

The Greentherm models C 950 ES & C1050ES are also approved for PP twin-pipe venting systems. Availability of generic PP vent pipe has increased and systems are becoming more popular due to ease of installation.  The twin pipe installation would be used if the customer needed to go out a different area out the sidewall or through the roof and would need to take the combustion air from the outside also.



New Bosch Greentherm C 1050 ES Condensing Tankless Water Heater

The New Bosch Greentherm C 1050 ES Condensing tankless water heater is a top performance, fully condensing gas tankless water heater from Bosch. This 199,000 BTU heater is designed for residential or commercial applications and can deliver hot water up to 140 degrees F with a 10.5 GPM flow rate.  Not approved for space heating applications.

This Energy Star approved tankless water heater can produce enough hot water for 2-3 major applications in most homes or is good for most commercial applications.  The Greentherm C 1050 ES is now 94% energy efficient.

Unlike traditional non-condensing models, condensing technology captures heat from the exhaust gas and uses it to preheat the incoming cold water. This increases efficiency and reduces emissions -- well ahead of the 2012 Low NOX emissions standards set by SCAQMD (California -- South Coast Air Quality Management District).  The Greentherm C1050ES now has NSF Certification (National Sanitation Foundation) for commercial kitchens.  The Bosch Green Therm C1050ES now has an added bypass tube connecting the cold and hot water lines inside the unit so the heater can mix a little cold water with the hot to alleviate and fluctuations and maintain a more stable temperature.  Standard now also are three NTC temperature sensors. With a new sensor immediately after the HEX, the Greentherm achieves benchmark temperature control. The NTCs are no longer clipped on, but rather installed into the inlet and outlet pipes.

The Bosch Greentherm C 1050 ES features an electronic ignition system and can vent through either 3 inch or 4 inch diameter PVC vent pipe either through the side wall or up through the roof.  The Greentherm C950ES now takes a new concentric venting system and attaches right to the top of the heater and takes its intake air and exhaust out through one hole to the outside.  The Greentherm C1050ES can now be cascaded together with up to 4 units and they can all vent into one pipe using a special venting kit to the outside.  Installation can be done venting up to 4 units together into the one pipe having the heaters mounted side by side or back to back.  The combustion air for the units will need to be taken from the inside of the building.

The Bosch Greentherm C 1050 ES comes with built in freeze protection.  The Greentherm C1050ES also comes with an external water filter screen.  The Bosch Green Therm C1050ES does not come with a 3/4" pressure relief valve, this is an accessory that would have to be ordered separately.

The freeze prevention kit is designed to provide protection for the water heater down to approximately 5°F for short term conditions only. It will not protect the appliance in areas where the temperature is routinely expected to be below freezing.  The freeze prevention kit will not protect plumbing outside the appliance from freezing.

The Bosch Greentherm C 1050 ES comes with a limited 15 year warranty on the heat exchanger and 5 years on all other parts.  Service and labor costs are not covered.

Bosch Therm C1050ES vs. Bosch Pro GWH C800ES

Recently the Bosch model GWH C 800 ES gas tankless water heater was changed to the new model name Bosch Therm C 1050 ES. The model name had changed to reflect gallons per minute (gpm) at a 35 degree temperature rise. So the Bosch Therm C1050ES would reflect a 35 degree temperature rise at 10.5 gpm. Along with this name change came many new features:

• Comes equipped with freeze prevention now.
• Has the capability to accept preheated water up to 140 degrees and is approved for domestic hot water (dhw), solar thermal and space heating applications in conjunction with an indirect tank.
• Has the ability to be cascaded using the Intelligent Cascade Kit for up to 24 units and would produce up to 290 gpm.

The temperature range for the Bosch C1050ES is from 100 - 140 degrees. With the use of the Bosch Therm High Temperature Kit the unit would have the ability to reach up to 180 degrees.