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Room-Sealed; Twin Pipe System (Recommended)
Exhaust Venting:
This heater requires Category III AL29-4C, 3" or 4"
diameter stainless steel vent pipe (3" provided in
Vent Kit).
AQ3 Vent Kit Items
Twin Pipe
Horizontal
Intake/Combustion Air:
The combustion air pipe system may be
constructed of either 3" PVC, aluminum or gal-
vanized pipe (aluminum provided in Vent Kit).
All parts shown in diagram
are included in AQ3 Vent Kit.
The AQ3 Vent Kit, for Bosch AquaStar Model 250SX, is designed to be used in the following room-sealed or
unsealed installations. Please note that some installations may require additional venting parts. See back page
for a list of additional venting parts.
The exhaust vent pipe and the combus-
tion air pipe each have a maximum
length of 26 feet (8m) with one elbow.
For each additional elbow after the first
elbow, you must reduce 2.5 feet
from the total length. A maximum of 3
elbows on each pipe is allowed.
A condensate drain kit
must be used in all
installations.
A condensate drain kit
is included with the
AquaStar 250SX.
4ZVAL03
Adjustable Adapter 3"
2SVSWTCEC03
Wall Thimble 3"
2SVSTB03
Exhaust/Intake Vent Hoods
w/10" Sleeve 3" (2)
2SVEEWCF0390
90 Degree Elbow 3"
1TLXXXX0310
Flex Pipe – Inlet Air
3" x 10'
7HS44XX
Gear Clamps 3" (2)
Dimensions listed in inches
4.25 to 7
10.00
10.00
11.50 to 15
7.91
7.91
5.00
5.00
5.00
5.00
12.01
12.01
Note: Refer to AquaStar 250SX Installation Manual for complete exhaust venting & combustion air requirements.