Application's Manual

Data subject to change without notice | 01.2011 BOSCH THERMOTECHNOLOGY CORPORATION
THERM Tankless Water Heater Applications Manual | 25
10.2 Booster applications
10.2.1 Solar DHW system with gas tankless water heater booster
The tankless water heater only runs when solar water needs a boost.
The Ariston mini tank provides small amounts of DHW instantly and
increases comfort by buffering DHW temperature. See applicable
models listed in the fi gure below.
 Thermostatic valve 1 ensures that warm solar water bypasses the
water heater and directs cooler water through the appliance
when reheating is needed.
 Thermostatic valve 2 acts as a tempering valve that brings
potentially hot water temperatures down to a level that is safe for
the inhabitants.
Symbols
Service
valve
Pressure
relief
valve
Honeywell
Am-1 series
thermostatic
mixing
valve
Solar
storage
tank
Flow
direction
Expansion
tank
Well
thermometer
Circulator
Drain
valve
Water
supply
Hot
Cold
Solar
Pump
Station
Domestic
hot water
Thermostatic
valve 1
Thermostatic
valve 2
Ariston GL8ti
mini tank
Solar
Controller
Collector
sensor
Tank
sensor
Applicable Bosch Models:
•Bosch 830 ES
•Bosch 940 ES/ESO
•Bosch C 1050 ES
•Bosch C 1210 ES/ESC
System parameters:
 Honeywell AM101 Thermostatic Valves required for proper
operation;
 Remove check valves from Thermostatic Valve 1 as it is used as a
diverter valve;
 Thermostatic Valve 2 is a tempering valve;
 Recommended setpoint 120°F for both Valves;
 Set tankless water heater temperature to
140° F
 Ariston mini tank will provide increased
temperature stability and quicker hot water
delivery. (recommended but not required)