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Bosch ProTankless C 1050 ES NG Tankless Water Heater, Natural Gas


Bosch ProTankless C 1050 ES NG Tankless Water Heater, Natural Gas

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Bosch ProTankless C 1050 ES NG Tankless Water Heater, Natural Gas

Bosch ProTankless C 1050 ES NG Tankless Water Heater, Natural Gas Features:
• 92% thermal efficiency " .90 energy factor
• Condensing heat exchanger for maximum efficiency
• Vents vertically or horizontally with 3" PVC, CPVC or ABS-DWV
• Concentric and twin pipe venting options
• Direct vent, room-sealed combustion
• Ability to cascade units for increased flow rates
• Suitable for recirculating applications
• Outdoor installation using optional kit
• Available in natural gas (NG) or liquid propane (LP)
• 15-year warranty
• Power Input NG: 199,000 BTU/Hr
• Maximum Flow to Activate 0.65 gallons per minute (gpm)
• Flow Rates:

  • 35°F rise@ 10.1 gpm
  • 45°F rise@ 8.0 gpm
  • 55°F rise@ 6.4 gpm
  • 65°F rise@ 5.5 gpm
  • 77°F rise@ 4.6 gpm
  • 90°F rise@ 3.9 gpm

• Energy Factor NG: .89
• Thermal Efficiency NG: 92%
• Dimensions H: 30½" W: 17.875" D: 11¼"
• Weight 74 lbs.
• Modulating Gas Valve Min Firing Rate: 19,900 BTU/Hr, Max Firing Rate: 199,000 BTU/Hr
• Ignition Electronic
• Also know as: GWH C 800 ES NG

Bosch ProTankless C 1050 ES NG Tankless Water Heater, Natural Gas Specifications:
• Gas Connection ¾" Male NPT
• Water Connections ¾" Male NPT
• NG Gas Pressure Minimum: 4" WC, Maximum: 14" WC
• Water Pressure Minimum: 30 PSI, (Well): 40 PSI, Maximum: 150 PSI
• Electrical Supply 120V - (plugs in)
• Installation Clearance:

  • Top: 12"
  • Front: 1"
  • Back: 0"
  • Sides: 1"
  • Floor: 12"
C 1050 ES NG
Gas Type:
Natural Gas
Product Rating:
4 Star Avg Rating

Specification Manual
4.4/5 Stars
5 reviews
Sort Display Write a Review
3/5 StarsService / Warranty disclosure | Long story, but well worth the time to read!!!!Bosch does not cover any service labor costs for warranty work, even on an out of the box brand new defect as described bellow. As a General Contractor, I am looking for the best value for my customers. Best value includes price, manufacture recognition and support, as well as warranty. I recently purchased, after much research by my customer, and had my plumbing subcontractor install a Bosch ProTankless GWH C 800 ES NG Tankless Water Heater. An internal leak was noticed upon commisioning of the new installation. This leak was at a union in the water inlet fittings. I was told, by the Bosch support group, a couple of ways the problem could be field corrected. The Bosch product manual reads "Service Labor Costs
This warranty does not cover any labor costs
associated with service, removal or re-installation of
part(s). All such costs must be borne by the Purchaser.
Additionally, this warranty does not cover any labor
costs associated with service, removal or re-installation
of the original water heater or a replaced water heater. When requesting a Bosch factory rep's assistance,I was told that there was no factory service rep for this issue in the Seattle market. I was also told as the above manual mentioned that there was no recourse for labor costs recovery even considering this was a brand new out of the box unit. My customer researched several manufacturers using online manufacturers detailed specifications, reviews by previous customers, etc. The thought of this type of problem never occured to either of us. Be fore warned. I will be looking at the other major manufacturers warranty manuals to educate myself and my customers. It is a sham and a shame that either the customer or the installer has to bore the expense related to this type of situation.
Recommended? No.
4/5 StarsPROFESSIONAL INSTALLATION | Thank goodness we had a certified plumber install the unit. There are various ways to install the Bosch depending on your site and he read the manual to determine the best suited to our needs. It was more than we would have been able to handle. The gas lines, plumbing lines, venting, removal of the old water heater, and testing were all done by our plumber. It was an 8-hour job. It takes a bit to get used to the blast of cold water if you change the water pressure during a shower or washing dishes, etc.
Recommended? Yes.
5/5 StarsExcellent piece of equipment | The product does everything it promises - reliable source of hot water and my gas bill gas dropped
Recommended? Yes.
5/5 Starsbosch gwhc800esng worth the money | replaced a navien condensing tankless unit that had multiple bad parts from day one, The Bosch gwhc800esn by far is built to last. very simple to install and control it seems to be the best condensing tankless water heater in the industry along with its great warranty. the navien was cheaper but the problems were expensive. The Bosch is well worth the extra $$$$$
Recommended? Yes.
5/5 StarsExcellent top of the line tankless | While it is expensive, it is cheaper to install than most other water heaters because I could use PVC pipe. Also, consider getting the concentric vent kit... so you only have to drill one hole in the wall of the house.
Recommended? Yes.
Sort Display Submit a Question
Q:Is this tankless water heater sufficient to supply to a 2500 sq ft home?Bobbi Ann | Wednesday, February 12, 2014
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For technical support and a product recommendation, please contact Bosch directly. They will have a licensed professional on hand who can better recommend a model for you.
Adam | Thursday, February 13, 2014
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