Bosch 520PN Applications Manual page 22

2 0 | THERM/GREENTHERM Tankless Water Heaters
9.2.3 Bosch gas water heater with domestic
recirculation loop
The circulator should be controlled by an external aq-
uastat and/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.
Data subject to change
See Chapter 5.2 for recirculation pump
parameters
Applicable models: Bosch 520 PN, 520 HN, 830 ES,
940 ES, 940 ESO, C 950 ES, C 1050 ES, C 1210 ES,
Mini tank: Bosch Tronic 3000T ES8.
Bosch
Applications Manual
Bosch Thermotechnology Corp.