Application's Manual

Data subject to change without notice | 01.2011
BOSCH THERMOTECHNOLOGY CORPORATION
THERM Tankless Water Heater Applications Manual
18
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8.2.3 Bosch gas water heater with domestic recirculation loop
The circulator should be controlled by an external aquastat or with a
timer to run only during times of expected hot water usage.
Insulate piping in hot water recirculation loop to limit heat loss.
Ariston Pro mini-tank
(2.5, 4 and 8 gallon
sizes)
ColdHot
Note:
Drawing is not to scale.
Cold water piping to fixtures not shown for clarity purposes.
Symbols
Service
valve
Sink
Standard
tub fixture
Bronze or stainless steel
circulator pump sized
according to UPC standards
(Taco Bronze 007 or Grundfos 15-42B
will cover most homes up to 3 bathrooms)
Potable water
expansion tank
Flow check valve
Flow direction
Timer
Aquastat
Applicable Bosch Models:
•Bosch 520 PN •Bosch 520 HN
•Bosch 830 ES •Bosch 660 EF
•Bosch 660 EFO •Bosch 940 ES
•Bosch 940 ESO •Bosch C 1050 ES
•Bosch C 1210 ES
See Chapter 5 for recirculation pump parameters