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14
Installation instructions
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.
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 Vent connections and 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.
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
Reduce maximum
length 6 ft for each
90 elbow after the
first one and 3 ft for
each 45 elbow.
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
Vertical
Condensate
drain
2SVSEVDP03 N/A N/A
Condensate
Drain Tube
2SVEDTK N/A 7000TUBE
Table 5 Approved vent termination and condensate
drain part numbers (subject to change)