Basic Tank Loading With Domestic Recirculation - Bosch C 1210 ES Applications Manual

3 0 |

12.2 Basic tank loading with domestic recirculation

The following application outlines general tank loading with one or
more gas tankless water heaters in parallel. Domestic hot water
recirculation shown is optional.
System parameters:
• Aquastat/tank sensor Tset 120-140°F, <10°F differential.
• 30-119 gallon storage tank recommended
• DHW return line can tie directly into tank if fi ttings are available.
• Individual pumps (i.e. UP26-99) can be used on supply to each
heater or one pump (as shown) for the entire system
See Chapter 5.1 and 5.2 for pump parameters
Applicable Bosch Models:
•Bosch 830 ES
•Bosch C 1050 ES
Domestic
Hot Water
supply
Aquastat
or tank sensor
Hot water
DHW
recirculation
recirculation
return line
pump
Service
Well
valve
thermometer
Data subject to change without notice | 01.2011
•Bosch 940 ES
•Bosch C 1210 ES/ESC
Pressure
Solar
relief
storage
valve tank
THERM Tankless Water Heater Applications Manual
Aquastat / Water Heater setpoints
Model Number
C 1210 ESC
830 ES,
940 ES,
C 1050 ES,
C 1210 ES
* If local codes require higher setpoint or to increase the recovery
capacity of the water heater, contact Bosch Thermotechnology.
Symbols
Bronze or
Flow
Drain
stainless
direction
valve
steel
circulator
Aquastat setpoint Water heater
setpoint
≤140°F 14°F above Aqua-
stat setpoint
≤126°F* 140°F
Flow
Potable
check
water
valve
expansion
tank
BOSCH THERMOTECHNOLOGY CORPORATION
Cold
Water
Supply