Bosch GWH C 920 ES - Page 20

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Bosch applications manual
Bosch applications manual | 06.2009
BOSCH THERMOTECHNOLOGY CORPORATION
7.2.5 Bosch ProTankless 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
Bosch GWH 425 PN,
Bosch GWH 425 HN,
Bosch GWH 715 ES,
Bosch GWH C 800 ES,
Bosch GWH C 920 ES
Aquastat
See Chapter 5.1 for recirculation pump parameters