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Bosch C 1210 ES Applications Manual page 19

Bosch therm tankless water heaters
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THERM Tankless Water Heater Applications Manual
8.2.4 Bosch 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.
Hot Cold
Domestic
hot water
tap
Aquastat
Note:
Drawing is not to scale.
Cold water piping to fixtures not shown for clarity purposes.
BOSCH THERMOTECHNOLOGY CORPORATION
Applicable Bosch Models:
•Bosch 520 PN
•Bosch 520 HN
•Bosch 660 EF/EFO
•Bosch 830 ES
•Bosch 940 ES/ESO
•Bosch C 1050 ES
•Bosch C 1210 ES/ESC
Y-strainer
Flow
Timer
check
valve
See Chapter 5.1 for recirculation pump parameters
Cold
water
supply
Domestic
hot water tap
Symbols
Pressure
Potable
Service
relief
valves
water
valve
expansion
tank
Domestic
hot water
tap
Domestic
hot water
tap
Flow
Bronze or
direction
stainless steel
circulator/
pump
Data subject to change without notice | 01.2011
| 19

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