Data subject to change without notice | 01.2011
BOSCH THERMOTECHNOLOGY CORPORATION
THERM Tankless Water Heater Applications Manual
24
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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
Pump
Station
Domestic
Hot
Water
Solar
Controller
Cold
Water
Supply
Symbols
Service
valve
Pressure
relief
valve
Honeywell
Am-1 series
thermostatic
mixing
valve
Solar
storage
tank
Flow
direction
Potable
water
expansion
tank
Well
thermometer
Circulator
Thermostatic valve
Setpoint 120°F
Collector
sensor
Aquastat
or tank sensor
Tank
sensor
Drain
valve
Twin
tube
Expansion
tank
Applicable Bosch Models:
•Bosch 830 ES
•Bosch 940 ES/ESO
•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/ESO,
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.
See Chapter 5.2 for tank loading pump parameters
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