Application's Manual

Data subject to change without notice | 01.2011 BOSCH THERMOTECHNOLOGY CORPORATION
THERM Tankless Water Heater Applications Manual | 23
9.2 Parallel unit applications
Two Bosch water heaters plumbed in parallel will have double the
fl ow rate. However, the activation rate increases with each unit
added in parallel.
Example:
1 unit - 0.5 GPM activation rate
2 units - 1.0 GPM activation rate
3 units - 1.5 GPM activation rate
cold
cold
cold
hot
hot
hot
Note:
Drawing is not to scale.
Symbols
Service
valve
Flow direction
Pressure
relief
valves
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
*see text above about activation rate