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Bosch GWH 635 ESBosch ProTankless™ GWH 635 ES Gas Tankless Water Heater

Powerful enough to supply two showers* running simultaneously!

Bosch's most powerful gas tankless water heater offering. Certainly the engineers at Bosch have outdone themselves — the beauty of this unit is in its simplicity. The GWH 635 ES requires no special tools to install or maintain. And its compact size and sealed combustion enables installation in small spaces. A built-in power vent makes both vertical and horizontal venting possible while the electronic ignition maximizes energy efficiency. This unit yields enough power to supply two showers* ssimultaneously and features an adjustable temperature control for improved comfort.

With sealed combustion, a 3" vent, and the ability to vent either horizontally or vertically, the unit can be installed almost anywhere.

• Direct Vent Room Sealed Combustion
• Modulating gas valve with digital thermostat to control temperature up to 140ºF
• H 23½" x W 15¾" x D 8½"
• *each shower = 2.5 gpm at a 50ºF rise.
• Up to 175,000 Btu/h
• NOTE: For Massachusetts Residences considering purchasing and installing the 635ES, please consult with Bosch or your licensed contractor for venting requirements.
• Venting: 3" stainless steel
• Electronic ignition - plugs into 120V (no standing pilot)
• For several pages of information about the advantages tankless "on demand" water heaters, visit our Bosch Help Center.
• Energy Saving Chart
• National Listings and Approvals
• Frequently Asked Questions
  
  

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• Bosch Tankless Water Heater GWH 635 ES Brochure (615 KB Adobe PDF)
• Bosch Tankless Water Heater GWH 635 ES Troubleshooting
• Bosch Tankless Water Heater GWH 635 ES Installation Manual (3.1 MB Adobe PDF)
• Bosch Tankless Water Heater GWH 635 ES Parts Guide (780 KB Adobe PDF)

Warning: Do not mount heater directly onto vinyl siding.  A 6' x 4' area of vinyl siding must first be covered or replaced with wood or other non-plastic material.

High Altitude Operation:

Information Source: Bosch Water Heating