Unpacking the heater
Only suitable for Natural gas. Outdoor model can not be
converted to LP.
The heater is default-set by the manufacturer to operate
with Natural Gas. Before installing the unit, be certain you
have the heater correctly set for your type of Gas - Natural
Identification labels are found on the shipping box, and on the
rating plate which is located on the left side (when facing
appliance front) of the cover.
 Serial number
 Type of gas (Natural gas)
3.3.1 The box includes
Bracket and screws for wall hanging the heater
Installation manual (manual can be downloaded at
The Greentherm T9800 SEO is not approved or designed
Manufactured (mobile) homes, boats or any mobile
installation. (Modular homes are acceptable for
Use above 8000 ft A.S.L. altitude.
Applications where inlet water temperature is higher
than 140 °F (60 °C) for Residential appliances. In these
applications a 3 way valve or thermostatic mixing valve
must be installed before the appliance's water inlet
Use with commercial dishwasher pre rinse spray valves.
Greentherm T9800 SEO 160/199 | SECO 199 – 6 720 817 281 (2018/12)
Use with LP gas.
In preheated inlet water applications (i.e. solar preheat),
activation flow rate will vary depending upon the unit set point,
inlet water temperature and the demand flow rate thru the unit.
Please consult Bosch for further details to determine if this will
function in your application.
3.3.2 Remove front cover
▶ Loosen two Phillips head screws located on bottom of cover
Loosen two Phillips head screws
▶ Lift the front cover to remove from the appliance.
▶ Install the appliance vertically with the plumbing
connections facing the ground.