6 720 816 815 (2018/08) Greentherm T9800 SE 160/199 | SEC 199
36 | Installation instructions
• Internal NTC
– Uses the appliance's NTC sensor to measure the
incoming water temperature.
4.12 Space heating applications
Greentherm T9800 SE / SEC tankless water heaters are
approved for use in combination DHW and space heating
applications (open loop setup).
These water heaters are not approved for use in space heating
only applications (closed-loop setup). Bosch supports
applications of combination DHW and space heating in an open
loop configuration if plumbed similar to Fig. 32. Please see
warranty document for additional details.
CAUTION:
▶ If the set point temperature is above
120°F, precautions should be taken to
protect users of potable water from
scalding.
CAUTION:
▶ The use of a flow switch is
recommended to ensure DHW priority
and to prevent “cold-blow” situations
when the Bosch tankless water heater is
used with an air handler.
Air handler installation must include a
pump.
The flow switch should be used to
disable the blower on the air-handling
system when domestic water is used.
CAUTION:
▶ Ensure the primary pump is properly
sized to provide adequate flow for the
system heat load.
For external pump sizing please refer to the
pressure drop curves, fig. 33. Also
remember to account for system piping
pressure loss. A minimum of 1.7 GPM is
recommended to provide adequate flow
through the water heater when determining
the size of the primary pump.
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