Now you can install your tankless water heater outdoors!

Built in freeze protection to 5ºF. Eliminate the need for vent pipe and free up valuable space in your home.

The attractive sleek design of the ProTankless™ GWH 635 ESO model will complement any house style and color. And with an efficiency rating of 87%, the ability to supply two showers running simultaneously, and a digital temperature control, your customers will be all smiles with their new Bosch water heater.

• 87% efficiency rating
• Delivers over 6 gallons per minute, enough to run two showers* at once

*each shower = 2.5 gpm at a 50ºF rise.

TECHNICAL SPECIFICATIONS Power Input NG: 35,000 - 175,000 Btu LP: 31,000 - 175,000 Btu Minimum Flow Rate to Activate .8 gallons per minute (gpm) Flow Rates 90° F rise / 3.2 gpm 75° F rise / 3.9 gpm 65° F rise / 4.5 gpm 55° F rise / 5.2 gpm 45° F rise / 6.4 gpm Energy Factor .85 Thermal Efficiency 87% (recovery efficiency) Dimensions 23½”h x 15¾”w x 8½”d Weight 47 lbs. (21 kg) Ignition Electronic Life Expectancy 20+ years Optional Accessories Wireless Remote control INSTALLATION SPECIFICATIONS Gas Connection ¾" Male NPT Water Connection ¾" Male NPT LP Gas Pressure (For more details on gas pressure, please refer to this tech bulletin) Minimum: 11" WC Maximum: 14 " WC Water Pressure Minimum: 30 PSI Maximum: 150 PSI Electrical Supply 120 VAC 50/60 Hz Idle 40mA, Operation = 2.5A

HIGH ALTITUDE OPERATION

Altitude Natural Gas Liquid Propane Special Notes  0 - 4,000 ft (0-1,219 m) no modification no modification For operation at elevations above 2,000 ft (610 m) the equipment ratings shall be reduced at the rate of 4% for each 1,000 ft (305 m) above sea level. 4,000 ft - 7,000 ft (1,219m-2,134m) CO2 adjustment with flue gas analyzer required Refer to this tech bulletin. Above 7,000 ft (above 2,134 m) Not approved