Residential Solar Applications; Tankloading - Bosch C 1210 ES Applications Manual

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10 Residential Solar Applications

Introduction
This section gives a general overview of tank loading and in line
booster applications for domestic hot water in conjuction with solar
water heating. For additional system details, consult the Bosch
Solar Technical Guide
10.1 Tank loading
10.1.1 Solar DHW system with gas tankless water heater tank
loading
In this system the gas tankless water heater keeps the comfort zone
at top of tank at desired temperature.
Use applicable models with aquastat that activates circulator.

Timer recommended to interrupt reheating during night time.

Solar
Controller
Honeywell Well
Am-1 series
thermometer
thermostatic
mixing
valve
Data subject to change without notice | 01.2011
Collector
sensor
Domestic
Hot
Water
Twin
tube
Solar
Pump
Station
Tank
sensor
Symbols
Pressure
Solar
Service
relief
storage
valve
valve
tank
THERM Tankless Water Heater Applications Manual
Aquastat / Water Heater setpoints
Model Number Aquastat setpoint
C 1210 ESC ≤140°F
830 ES, ≤126°F*
940 ES/ESO,
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.
See Chapter 5.2 for tank loading pump parameters
Applicable Bosch Models:
•Bosch 830 ES
•Bosch 940 ES/ESO
•Bosch C 1050 ES
•Bosch C 1210 ES/ESC
Thermostatic valve
Setpoint 120°F
Aquastat
or tank sensor
Potable
Flow
water
direction
expansion
tank
Water heater
setpoint
14°F above Aqua-
stat setpoint
140°F
Expansion
Drain
Circulator
tank
valve
BOSCH THERMOTECHNOLOGY CORPORATION
Cold
Water
Supply