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Installation instructions
Vent pipe
Reduce maximum
length 6 ft for each
90 elbow after the
first one and 3 ft for
each 45 elbow.
Fig. 13 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.
Company
Contact information
Z-flex
www.z-flex.com
800-654-5600
ProTech
www.protechinfo.com
Industries
800-766-3473
Heat-Fab
www.heatfab.com
800-772-0739
Table 4 Vent manufacturer contact information
14
3" Horizontal
terminator
3" Vertical
terminator
90°
Condensate
drain Tee
Horizontal
Condensate
Combustion
drain
air intake
Vertical
Condensate
drain
Condensate
Drain Tube
Table 5 Approved vent termination and condensate
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 32. Correct the problem and then reset the heater
before operating.
3.6.2
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.
Z flex
Protech
TEE only
TEE only
2SVSRCF03
2SVEVWCF03
2SVEDWCF03
FSHD03
2SVSEVDP03
2SVEDTK
drain part numbers (subject to change)
Vent connections and air inlet restrictors
Heat Fab
9390 TEE
FSRC3
5300CI
FST3 &
93PLSTEE
FSDF3
9321
N/A
N/A
N/A
7000TUBE
6 720 607 909
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