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Specification Sheet

ManualsBrandsAO Smith ManualsHot Water TanksAO Smith 100 Gallon Commercial Natural Gas Water Heater with 250,000 BTU Input from the Cyclone Series
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AOSCG10210
Commercial Gas
Water Heaters
Number of 90°
Elbows Installed
3 Inch Pipe 4 Inch Pipe
Maximum Feet
(Meters)
Maximum Feet
(Meters)
One (1) 45 feet (13.7 meters) 115 feet (35 meters)
Two (2) 40 feet (12.2 meters) 110 feet (33.5 meters)
Three (3) 35 feet (10.7 meters) 105 feet (32 meters)
Four (4) 30 feet (9.1 meters) 100 feet (30.5 meters)
Five (5) N/A 95 feet (29 meters)
Six (6) N/A 90 feet (27.4 meters)
Number of 90°
Elbows Installed
4 Inch Pipe 6 Inch Pipe
Maximum Feet
(Meters)
Maximum Feet
(Meters)
One (1) 65 feet (19.8 meters) 115 feet (35 meters)
Two (2) 60 feet (18.2 meters) 110 feet (33.5 meters)
Three (3) 55 feet (16.8 meters) 105 feet (32 meters)
Four (4) 50 feet (15.2 meters) 100 feet (30.5 meters)
Five (5) 45 feet (13.7 meters) 95 feet (29 meters)
Six (6) 40 feet (12.2 meters) 90 feet (27.4 meters)
Model Number
Manifold Pressure Minimum Supply Pressure Maximum Supply Pressure
Natural Gas Propane Gas Natural Gas Propane Gas Natural Gas Propane Gas
BTH-120(A) 0"W.C. (0 kPa) 0"W.C. (0 kPa) 3.5"W.C. (1.10 kPa) 8.5"W.C. (2.12 kPa) 14"W.C. (3.49 kPa) 14"W.C. (3.49 kPa)
BTH-150(A) 0"W.C. (0 kPa) 0"W.C. (0 kPa) 3.5"W.C. (1.10 kPa) 8.5"W.C. (2.12 kPa) 14"W.C. (3.49 kPa) 14"W.C. (3.49 kPa)
BTH-199(A) 0"W.C. (0 kPa) 0"W.C. (0 kPa) 3.5"W.C. (1.10 kPa) 8.5"W.C. (2.12 kPa) 14"W.C. (3.49 kPa) 14"W.C. (3.49 kPa)
BTH-250(A) 0"W.C. (0 kPa) 0"W.C. (0 kPa) 3.5"W.C. (1.10 kPa) 8.5"W.C. (2.12 kPa) 14"W.C. (3.49 kPa) 14"W.C. (3.49 kPa)
BTH-300(A) 0"W.C. (0 kPa) 0"W.C. (0 kPa) 4.8"W.C. (1.19 kPa) 8.5"W.C. (2.12 kPa) 14"W.C. (3.49 kPa) 14"W.C. (3.49 kPa)
BTH-400(A) 0"W.C. (0 kPa) 0"W.C. (0 kPa) 4.8"W.C. (1.19 kPa) 8.5"W.C. (2.12 kPa) 14"W.C. (3.49 kPa) 14"W.C. (3.49 kPa)
BTH-500(A) 0"W.C. (0 kPa) 0"W.C. (0 kPa) 4.8"W.C. (1.19 kPa) 8.5"W.C. (2.12 kPa) 14"W.C. (3.49 kPa) 14"W.C. (3.49 kPa)
VENT REQUIREMENTS FOR BTH 120(A) - 250(A)
VENT REQUIREMENTS FOR BTH 300(A) - 500(A)
GAS PRESSURE REQUIREMENTS
OTHER FEATURES:
SPACE-SAVING DESIGN FOR INSTALLATION FLEXIBILITY
• Easy-to-remove top cover for convenient access to serviceable parts
• 0˝ installation clearances on sides and rear, 1-1/2˝ installation
clearance on top
• Handhole cleanout allows easy access to tank interior for cleaning
• 0˝ clearance to combustibles, approved for installation on
combustible floors
CODES AND STANDARDS
• CSA certified and ASME rated T&P relief valve
• Maximum hydrostatic working pressure: 160 psi
• All models are design certified by Underwriters Laboratories (UL),
Inc., to ANSI Z21.10.3 - CSA 4.3 Standards
• Meets the thermal efficiency and standby loss requirements of the
U.S. Department of Energy and current edition ASHRAE/IES 90.1
• Design Certified by Underwriters Laboratories to NSF standard 5 for
180°F (62°C) water
• Complies with SCAQMD Rule 1146.2 and other Air Quality
Management Districts with similar requirements for ultra low-NOx
emissions
• ASME tank construction optional on 120-500 model sizes
Depending on the installed equivalent length, and/or the number of appliances connected, the supply gas line size may need to be increased beyond the minimum required size.