10 | Appliance details
Unpacking the heater
The heater is default-set by the manufacturer to operate with
Natural Gas, for use with Liquid Propane, follow the conversion
instructions in section 6.8.1. Before commissioning the unit
be certain you have the heater correctly set for your type of
Gas - Propane or Natural Gas. 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.
[A] Serial number
[B] Type of gas (Natural gas by default)
3.3.1 The box includes
LP Conversion Kit
Pressure relief valve
Bracket and screws for wall hanging the heater
Installation manual (manual can be downloaded at
The Greentherm T9800 SE / SEC are not approved or
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 or 180 °F (82 °C)
for Commercial appliances.
In these applications a 3 way valve or thermostatic mixing
valve must be installed.
▶ Slowly open the front cover .
6 720 816 815 (2018/08)
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 the bottom of
the front cover (fig. 3).
Loosen two Phillips head screws
Greentherm T9800 SE 160/199 | SEC 199