Installation and Operating Instructions
Bosch GreenTronic 7000 T Hybrid Electric Water Heater - BTC 755003301 A (03.2024)
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5.5.1 Equivalent Feet for Duct Accessories
Elbows/Bends
An elbow is defined as a rigid duct with a flex bends greater than 45°. If a bend is
needed that has a tighter radius than its diameter, then a rigid elbow must be used.
Table 13 lists the maximum number of elbows/bends allowed.
Terminations/Registers
Table 13 accounts for equivalent feet for terminations includes the rodent screen
and it accounts for the duct reducer and termination/register. Smaller diameter
terminations and registers with more than a 2ft (0.6m) connection should not be
used.
Damper
An approved damper should be installed no further than 10ft (3m) of rigid ducting
total (two elbows equivalent) from the unit if ducting to the outside while using an
exhaust duct only (no intake duct). This action will prevent outside air from entering
the living space.
Description 8" 7" 6" 5"
Elbow / Flexible Bends (Each)
[Maximum Allowed]
5 ft
[8]
5 ft
[6]
5 ft
[4]
5 ft
[2]
8 in. UL Certied Termination for ducting
outside (Each)
5 ft 5 ft 5 ft 5 ft
Reduced diameter UL Certied Termination for
ducting outside (Each)
N/A 10 ft 15 ft 20 ft
8 in. Register for ducting inside (Each) 5 ft 5 ft 5 ft 5 ft
Reduced diameter Register for ducting inside
(Each)
N/A 10 ft 15 ft 20 ft
Rodent Screen (must be greater than 83%
open area) (Each)
1 ft 1 ft 1 ft 1 ft
Approved 8” diameter Duct Damper 25 ft 20 ft 10 ft 5 ft
Table 13 Equivalent feet for duct accessories/reduced diameter terminations
5.5.2 Duct Installation
NOTICE
Product damage!
• Horizontal termination to the outside is recommended to avoid water
getting into the unit.
Determine the duct terminal location and create a hole through the exterior wall
to accommodate the UL Certified Termination that is sufficient to prevent water
entering the water heater.
8" Duct Adapters are available for this unit with following part numbers:
Adaptor Type Part Number
Intake Duct Adaptor 7738007443
Exhaust Duct Adaptor 7738007444
Table 14 Duct adapter part numbers
Figure 7 Horizontal duct installation example
Intake
Duct
Adapter
Wall
Air Inlet
Cold Air
Exhaust
6"
Clearance
for filter
Exhaust
Duct
Adapter
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