6 720 607 909
14
Installation instructions
Fig. 14 Maximum vent and combustion air lengths
Vent material
The GWH-345/450-ESR requires 3 inch sealed single
wall stainless steel vent pipe (AL29-4C). Use of any
other vent material will void the manufactures warranty
and may result in a hazardous condition. For specific
questions concerning vent material, specifications,
usage or installation, contact the vent manufacturer
directly.
Contact your Bosch supplier for stocked vent material.
Vent Safety System
The GWH-345/450-ESR will shut down if inadequate
exhaust venting is detected or a lack of combustion air
is provided to the unit; see troubleshooting section on
page 34. Correct the problem and then reset the heater
before operating.
3.6.2
Vent connections and combustion air inlet
restrictors
Exhaust vent connection
B
Attach the flue gas exhaust accessory (8 705 504
142) to the top of the unit (position 1) using the 4
screws and gasket provided
B
Insert 3" single wall stainless steel vent pipe into
exhaust vent adapter 1.5" and tighten the clamp
(position 2).
Note:
Failure to fully insert and tighten vent pipe may
cause flue gas leakage or condensate damage that is
not covered under the manufacturer's warranty.
Fig. 15 Exhaust vent connection
Company
Contact information
Z-flex
www.z-flex.com
800-654-5600
ProTech
Industries
www.protechinfo.com
800-766-3473
Heat-Fab
www.heatfab.com
800-772-0739
Table 4 Vent manufacturer contact information
6720607909-14.3JS
Vent pipe
Combustion
air intake
Z flex
Protech
Heat Fab
3” Horizontal
terminator
TEE only
TEE only
9390 TEE
3” Vertical
terminator
2SVSRCF03
FSRC3
5300CI
90°
Condensate
drain Tee
2SVEVWCF03
FST3 &
FSDF3
93PLSTEE
Horizontal
Condensate
drain
2SVEDWCF03
FSHD03
9321
Condensate
Drain Tube
2SVEDTK
N/A
7000TUBE
Table 5 Approved vent termination and condensate
drain part numbers (subject to change)