Bosch GWH 450 ESR
Bosch GWH 450 ESR
 
Recirculating tankless water heaters for the professional.

  • Durable heat exchanger specifically designed for recirculating applications
  • Vents vertically or horizontally with 3" stainless steel (AL29-4C)
  • Direct vent and sealed combustion
  • LCD screen displays temperatures, burner operation, & diagnostic codes
  • Separate temperature controls for domestic water heating & recirculation
  • Available in natural gas (NG) or liquid propane (LP)
  • 10-year limited warranty
Download Bosch GWH 345 ESR Sell Sheet & Manual below:
   
  GWH 450 ESR
Rated Efficiency
 81%
Power Input 120,000 BTU/Hr
Maximum Output
 98,400 BTU/Hr
Minimum Output
 35,500 BTU/Hr
Water Temp in Heating Circuit*
 115°F - 190°F
Maximum Exhaust Vent Length
 39' with one elbow**
Dimensions H: 27½" W: 15¾" D: 11½"
Weight 47 lbs.
Modulating Gas Valve Yes

 *Temperature setting range     **(90° elbow equals 6'; 45° elbow equals 3')

Installation Specifications
Gas Connection ¾" Male NPT
Water Connections ½" Male NPT
NG Gas Pressure Minimum: 5.5" WC
Maximum: 8" WC
LP Gas Pressure Minimum: 11" WC
Maximum: 14" WC
Electrical Supply
 120 VAC - plugs in
Exhaust Vent Size
 3" AL 29-4C single wall sealed stainless steel vent pipe (Z-Flex, Protech, Heat Fab)
Intake Vent Size
 3" Aluminum Flex, PVC or any other rigid or semi-rigid sealed pipe
   
GWH 450 ESR
345/450 ESR
 
Note: Specifications and product information subject to change without notice.