Application's Manual

Data subject to change without notice | 01.2011 BOSCH THERMOTECHNOLOGY CORPORATION
THERM Tankless Water Heater Applications Manual | 31
12.3 Advanced tank loading commercial hot water
system
The following application outlines an advanced tank loading
application for commercial hot water systems (e.g. hotels, fi tness
centers). This design allows for complete isolation of the system for
maintenance reasons and gives the ability to bypass certain system
components in case of failure. A second hot water storage tank is
shown for additional hot water supply and back up in case of tank
failure.
System parameters:
See Chapter 5.1 and 5.2 for pump parameters
Note:
Drawing is not to scale.
Symbols
cold supply
cold
hot
cold
hot
cold
hot
cold
hot
Service
valves
Pressure
relief
valve
Tankless
link
Flow
direction
Thermostatic
mixing
valve
Circulator
DHW
Applicable Bosch Models:
•Bosch 830 ES •Bosch 940 ES
•Bosch C 1050 ES •Bosch C 1210 ES/ESC
Aquastat / Water Heater setpoints
Model Number Aquastat setpoint Water heater
setpoint
C 1210 ESC ≤140°F 14°F above Aqua-
stat setpoint
830 ES
940 ES,
C 1050 ES,
C 1210 ES
≤126°F* 140°F
* If local codes require higher setpoint or to increase the recovery
capacity of the water heater, contact Bosch Thermotechnology.