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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.
Applicable Bosch Models:
Ariston Pro mini-tank
(2.5, 4 and 8 gallon
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)
Drawing is not to scale.
Cold water piping to fixtures not shown for clarity purposes.
Data subject to change without notice | 01.2011
• Bosch 520 PN
• Bosch 830 ES
• Bosch 660 EFO
• Bosch 940 ESO
• Bosch C 1210 ES
THERM Tankless Water Heater Applications Manual
See Chapter 5 for recirculation pump parameters
• Bosch 520 HN
• Bosch 660 EF
• Bosch 940 ES
• Bosch C 1050 ES
Flow check valve
BOSCH THERMOTECHNOLOGY CORPORATION