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Venting Options - Bosch Pro Tankless GWH-450-ES Series Manual

Temperature modulated with electronic ignition - normal duty suitable for recirculating potable water only
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Installation instructions
3.6.1

Venting options

Installing this water heater as a room sealed (TWIN
PIPE SYSTEM) is the recommended method. Contact
Bosch Water Heating or dealer for available vent
termination kits and vent materials for this water heater.
Room sealed installation (TWIN PIPE SYSTEM)
Fig. 15
Combustion air pipe: ≤ 39 ft (12 m)
Exhaust vent pipe: ≤ 39 ft (12 m)
Fig. 16
Combustion air pipe: ≤ 39 ft (12 m)
Note: reduce
6
ft for each 90° elbow used after the first
one, reduce
3
ft for each 45° elbow.
A maximum of four 90-degree elbows are permitted in
both the exhaust and combustion air vent lengths.
14
Open combustion installation (SINGLE PIPE
SYSTEM)
Not recommended in cold climate areas, see
Chapter 3.5.
Fig. 17
Exhaust vent pipe: ≤ 39 ft (12 m)
The exhaust vent system must vent directly to the
outside of the building and an adequate amount of
indoor combustion air must be provided for this
installation. See chapter 3.5.
Connecting a one piece 90 degree elbow pipe to the
combustion air inlet adaptor is necessary, this will
prevent debris or objects from ever falling into the inlet
opening.
Note: reduce
6
ft for each 90° elbow used after the first
one, reduce
3
ft for each 45° elbow.
A maximum of three 90-degree elbows are permitted.
6 720 607 915

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