Measurement Guide

Application Manual Greentherm T9800/9900 SE/SEO/SEi | 11
Bosch Thermotechnology Corp. | 12.2019
Data subject to change
4.2.2 Recirculation with the Greentherm T9900 models
The T9900 models have an integrated pump which removes the need to use an
external pump, and simplifi es the installation.
It is recommended that the recirculation system is designed to allow a recirculation
fl ow rate grater than 1GPM. Refer to fi gure 5 and fi gure 6 for the hydraulic curve of
the T9900 models integrated pump and the tankless pressure drop curve to proper
system dimensioning.
Recirculation internal pump
Figure 5
832107654
0
2
4
6
8
10
12
]tf
[ H
Q [GPM]
6720813635-27.1V
Hydraulic Curve
Pressure drop curve
Figure 6 Pressure drop curves for Greentherm 9000 models