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| Bosch ProTankless GWH C 920 ES/ESC |
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920 ES Series High Output Condensing Tankless Water Heater
Residential and Commercial Models Available
 The Bosch 920 ES Series is our newest ultra-high efficiency condensing tankless water heaters. With outputs as high as 9.2 gallons per minute at a 45°F degree raise, these heaters can satisfy virtually any demand for hot water. These heaters have inputs greater than 200,000 BTU/hr, so they are not eligible to participate in the Energy Star program, but with a thermal efficiency of 94%, they are extremely efficient.
Features & Benefits - 94% thermal efficiency
- Modulating/condensing for comfort and high efficiency
- 225,000 BTU/Hr maximum input,
- 25,000 BTU/Hr minimum input
- ASME certified
- Direct vent, vertically or horizontally with 3" PVC, CPVC or ABS-DWV
- Concentric and twin pipe venting options
- Electronic ignition
- Will deliver up to 36.8 gpm in a 4-unit cascade
- Solar application-ready
- Built for durability and serviceability
- Available for natural gas (NG) and liquid propane (LP)
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GWH C 920 ES (Residential) |
GWH C 920 ESC (Commercial)* |
| Power Input |
25,000 BTU/Hr Min
225,000 BTU/Hr Max |
25,000 BTU/Hr Min
225,000 BTU/Hr Max |
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| Max. Temp. of Output Water |
140°F |
180°F |
| Min. Flow to Activate |
0.65 gallons per minute (gpm) |
0.65 gallons per minute (gpm) |
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| Flow Rates |
45°F rise @ 9.2 gpm
55°F rise @ 7.5 gpm
65°F rise @ 6.4 gpm
77°F rise @ 5.4 gpm
90°F rise @ 4.6 gpm |
45°F rise @ 9.2 gpm
55°F rise @ 7.5 gpm
65°F rise @ 6.4 gpm
77°F rise @ 5.4 gpm
90°F rise @ 4.6 gpm |
| Thermal Efficiency |
94% |
94% |
| Dimensions |
30½" h x 177/8" w x 11¼" d |
30½" h x 177/8" w x 11¼" d |
| Ignition |
Electronic |
Electronic |
| Modulating Gas Valve |
Yes |
Yes |
| Accessories |
Concentric Termination Kit (#196016)
Outdoor Kit (#PTOK)
Wireless Remote (#TSTAT2)
Tankless Link Cascading Kit (#TLINK)
Freeze Protection Kit (7 709 003 574)
External Water Filter (8 703 305 356)
Isolation Valve Kit (9620LA)
Pipe Cover (#PTPCES)
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Concentric Termination Kit (#196016)
Outdoor Kit (#PTOK)
Wireless Remote (#TSTAT2)
Tankless Link Cascading Kit (#TLINK)
Freeze Protection Kit (7 709 003 574)
External Water Filter (8 703 305 356)
Isolation Valve Kit (9620LA)
Pipe Cover (#PTPCES)
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| Warranty |
15-year limited warranty on heat exchanger
(3-year if used in recirculating applications)
5-year limited warranty on all other parts |
2-year limited warranty on heat exchanger
(2-year if used in recirculating applications)
5-year limited warranty on all other parts
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Up to $1500 Federal
Tax Credit (30% of
purchase & install)
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Yes |
No |
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**The GWH C 920 ESC is a commercial model and is capable of outputting 180°F water. Due to the risk of scalding, use is not recommended
for residential applications and users should take precautions to prevent scalding.
All information in this table is for a single unit. See Technical Manual for cascading specifications.
Units ship complete with wall mounting bracket, pressure relief valve, built-in electronic temperature controls and are
equipped with 120V plug-in power cord. Refer to manual for condensate drain tee and complete venting requirements.
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“Tankless water heaters are (a technology) that has
significant energy savings potential compared to
conventional products. If these products eventually
achieve widespread market acceptance, tremendous
gains in energy savings and associated pollution
prevention could be achieved.”
U.S. Department of Energy, January 2004.
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