Bosch GWH C 920 ES - Page 21

Bosch applications manual | 06.2009BOSCH THERMOTECHNOLOGY CORPORATION
Bosch applications manual
| 21
7.2.6 Bosch ProTankless gas water heater with direct
recirculation loop
Use a circulator, aquastat and/or timer, to keep a loop of
hot water constantly hot and ready to use. This limits
wait time for hot water delivery to the tap and excessive
waste of water. Insulate piping in hot water recirculation loop to
limit heat loss.
If the water heater is used within an approved hot water
recirculation application and supplied with circulated
water, the heat exchanger warranty is decreased. Please
refer to the installation manual for detailed warranty
period information.
See Chapter 5.1 for recirculation pump parameters
Bosch GWH 715 ES,
Bosch GWH C 800 ES,
Bosch GWH C 920 ES/ESC,
Note:
Drawing is not to scale.
Cold water piping to fixtures not shown for clarity purposes.
Cold
water
supply
Hot
Cold
Domestic
hot water tap
Domestic
hot water
tap
Domestic
hot water
tap
Domestic
hot water
tap
Symbols
Pressure
relief
valve
Service
valves
Flow
direction
Bronze or
stainless steel
circulator/
pump
Aquastat
Timer
Flow
check
valve
Potable
water
expansion
tank
Y-strainer