THERM Tankless Water Heater Applications Manual
5 Pump sizing
The following section outlines sizing pumps for domestic hot water
circulation and tank loading. Only models approved for such
applications are listed in this section.
Pump must be bronze or stainless steel.
Size the pump according to the system pressure drop chart
Maximum flow allowed through the recirc loop is 5 GPM.
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
Run the system for 30 minutes to remove debris from the
plumbing. Then remove the unit's inlet water ﬁ lter to
decrease pressure drop through the system.
If the inlet water ﬁ lter, when removed, contains debris
install a Y-strainer (installer supplied) on the cold water
5.1 Pressure drop curves
BOSCH THERMOTECHNOLOGY CORPORATION
C 800 ES,
C 920 series,
C 1050 ES
C 1210 series
GWH 715 ES,
Data subject to change without notice | 01.2011