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13
Elbows/Bends
Rigid duct elbows and flex bends greater than 45°
is considered an elbow.
Flexible ducting bends’ inner radius cannot be less
than its diameter. If bends with tighter radiuses are
needed, a rigid elbow must be used.
Maximum number of elbows/bends allowed are
shown in [brackets] in Table 2.
Terminations/Registers
Table 2 equivalent feet for terminations includes
the rodent screen.
For terminations and registers with smaller
diameters than the duct diameter, Table 2 accounts
for the duct reducer and termination/register.
Smaller diameter terminations and registers with
more than a 2 ft. connection is not supported.
Damper
If ducting to the outside using an exhaust duct
only (no intake duct), an approved Rheem damper
should be installed no further than 10 ft. of rigid
ducting total (two elbows equivalent) from the
unit. This prevents outside air from coming into
the living space. If ducting air from the outside
to the inlet of the heater, no provision is made to
prevent outside air from flowing into the living
space.
Equivalent feet for Duct Accessories
Table 2.- Equivalent feet for Duct Accessories.
Description 8" 7" 6" 5"
Elbows/Flexible Bends (Each)
[Maximum Allowed]
5'
[8]
5’
[6]
5’
[4]
5’
[2]
8 inch UL Certied Termination for ducting outside (Each) 5' 5' 5' 5'
Reduced diameter UL Certied Termination for ducting outside (Each) N/A 10' 15' 20'
8 inch Register for ducting inside (Each) 5' 5' 5' 5'
Reduced diameter Register for ducting inside (Each) N/A 10' 15' 20'
Rodent Screen (must be greater than 83% open area) (Each) 1' 1' 1' 1'
Rheem approved 8" diameter Duct Damper 25' 20' 10' 5'
Table 2 lists equivalent feet for duct accessories and reduced diameter terminations.
Accessory Kits
Part Number Description User For
SP20882 Earthquake Isolation Kit for Hybrid Water Heater. Installations in Seismic Regions.
SP20883 Vibration Isolation Kit for Hybrid Water Heater. Installation on Non-Concrete oors.
SP20884 8” Dia. UL Certied Termination kit. Termination to the outside or to attic with 8" diameter.
SP20885 7” Dia. UL Certied Termination kit. Termination to the outside or to attic with 7" diameter.
SP20886 6” Dia. UL Certied Termination kit. Termination to the outside or to attic with 6" diameter.
SP20887 5” Dia. UL Certied Termination kit. Termination to the outside or to attic with 5" diameter.
SP20888 8" Rheem Approved Damper Kit.
Exhaust only to the outside Ducting Conguration (No
inlet Duct).
SP20889 25’ Flexible 8” dia. duct kit. For up to 25' of Ducting.
SP20890 Rigid Elbow Duct Kit.
Installation in tight places where space needs to be
minimized.
SP17829 Outlet Duct Adaptor Kit
Use for exhaust cool and dry air to another place inside or
outside the house ( use where applicable )
AP19134 Leak Sensor Use for water leak sensor ( for select models only )
SP21105 Inlet Duct Adaptor Kit
Use for bring warm air from another place inside or
outside the house ( use where applicable )
SP21111 Gen V leak sensor and shut off valve kit
Use for preventing leak and automatic water shut off
valve ( for select models only )
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