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Commercial Gas
Tankless Water Heater
TANKLESS CONDENSING HIGH EFFICIENCY
COMMERCIAL GAS
Ultra-Low NOx gas tankless water heaters with condensing technology featuring up to
0.95 Uniform Energy Factor (UEF) which lowers operating costs and is environmentally
friendly.
FEATURES:
ULTRA-LOW NOX CONDENSING
TECHNOLOGY PROVIDES UP TO 0.95
UNIFORM ENERGY FACTOR
DURABLE HEAT EXCHANGER
• Primary Heat Exchanger is constructed of
Commercial-Grade Copper that is more
resilient to erosion and is 25x better at heat
transfer than stainless steel thus stabilizing
outgoing water temperatures quicker
• Secondary Heat Exchanger is made of Type
316L Stainless Steel to protect against
corrosion
CONTINUOUS MAXIMUM FLOW
RATES UP TO 10.0 GPM
ENERGY STAR® QUALIFIED
AVAILABLE IN NATURAL GAS OR
PROPANE (LP)
INDOOR MODEL - INCLUDES
INTEGRATED TEMPERATURE
CONTROLLER AND ADVANCED
DIAGNOSTICS TO SIMPLIFY
TROUBLESHOOTING
OUTDOOR MODEL - INCLUDES
A WALL MOUNT TEMPERATURE
REMOTE CONTROLLER AND
ADVANCED DIAGNOSTICS TO
SIMPLIFY TROUBLESHOOTING
FACTORY-INSTALLED POWER CORD
INCLUDED FOR INDOOR MODELS
EASY-LINK UP TO 4 UNITS
(CT-199 MODELS ONLY)
• With no additional parts or accessories
needed
MULTI-LINK UP TO 20 UNITS
COMMON VENT UP TO 8 UNITS
COMPLIES WITH LEAD FREE
STANDARDS
• Safety Features:
• Air-Fuel Ratio (AFR) Sensor
• Exhaust & Water Temperature Safety
Control
• Overheat Cut-Off Fuse
INTERNAL FREEZE PROTECTION
SYSTEM
POWER DIRECT VENT DESIGN
• Exhaust, 3” PVC Venting up to 70 feet or
4” PVC Venting up to 100 feet
• Provides flexible venting with PVC, CPVC,
or ABS Pipe for Intake and Exhaust (solid
core only). Canadian Installations Require
ULCS636 Listed PVC or CPVC Pipe for
Venting.
• Category III or IV venting can be used
ACCESSORIES
• Pipe Cover
• Neutralizer Kit
• Isolation Valve Kits
• Concentric Termination
WARRANTY
• 6-year limited warranty on heat exchanger
in commercial applications
• 5-year limited warranty on all parts
INDOOR MODEL
CT-199
OUTDOOR MODEL
CT-199
©June 2018 A. O. Smith Corporation. All Rights Reserved
www.hotwater.com | 800-527-1953 Toll-Free USA | A. O. Smith Corporation | 500 Tennessee Waltz Parkway | Ashland City, TN 37015
ANSI Z21.10.3 CSA 4.3
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AOSCG14006
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Commercial Gas
Tankless Water Heater
Gas Consumption Input Inlet Gas Pressure
Model Number Type
Indoor Models
ACT-199I-N Natural 15,000 199,000 4.0 10.5 0.93 10 3/4" NPT 3/4" NPT 23-5/8 17-3/4 11-1/4 71
ACT-199I-P Propane 13,000 199,000 8.0 14.0 0.93 10 3/4" NPT 3/4" NPT 23-5/8 17-3/4 11-1/4 71
Outdoor Models
ACT-199O-N Natural 15,000 199,000 4.0 10.5 0.95 10 3/4" NPT 3/4" NPT 23-5/8 17-3/4 11-1/4 69
ACT-199O-P Propane 13,000 199,000 8.0 14.0 0.95 10 3/4" NPT 3/4" NPT 23-5/8 17-3/4 11-1/4 69
All dimensions are in inches.
15-150 psi Water Pressure. 40 psi or above is recommended for maximum flow.
*Current numbers based on factory testing; 0.4 GPM required for continuous fire after initial ignition.
Indoor models are certified from sea level to 10,100 ft. elevations.
Outdoor models are certified from sea level to 6,000 ft. elevation.
The manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligation.
Minimum
BTU/H
Maximum
BTU/H
Minimum
in. W.C.
Maximum
in. W.C.
UEF
Maximum
GPM*
Hot/Cold
Connections
Gas
Connection
Dimensions in Inches Approx
Shipping
Height Width Depth
Weight
(lbs)
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PRESSURE LOSS
0
20
40
60
80
100
120
0
5
10
15
20
25
30
35
40
45
50
0.01.0 2.03.0 4.05.0 6.07.0 8.09.0 10.0
Pressure Loss (psi)
Head (Feet)
0
20
40
60
80
100
120
Head (Feet)
340H
Set temperature 130˚F (55˚C) or higher
540H
Pressure Loss
Flow Rate (GPM)
FLOW RATE vs TEMPERATURE RISE
11.0
0.0
1.0
2.0
3.0
4.0
5.0
6.0
7.0
8.0
9.0
10 .0
11.0
020406080100
Flow Rate (GPM)
540H
240H
340H
Temperature Rise (°F)
Temperature Rise (°F)
10 .0
9.0
8.0
7.0
6.0
5.0
4.0
Flow Rate (GPM)
3.0
2.0
1.0
0.0
020406080100 120140
50
45
40
35
30
25
20
Pressure Loss (psi)
15
10
5
0
0.0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0 10.0 11.0 12.0
Commercial Gas
Tankless Water Heater
Flow Rate vs. Temperature Rise
Temperature Rise (°F)
Temperature Rise (˚F)
Set temperature 125˚F (52˚C) or lower
Set temperature 130˚F (55˚C) or
Pressure Loss
higher
120
100
80
60
Head (Feet)
40
20
0
Flow rate (GPM)
Flow Rate (GPM)
Set temperature 125˚F (52˚C) or lower
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7-7/8" (199 mm)
GAS 5-1/8" (131 mm)
OLD 6-3/4" (172 mm)
T 5-1/2" (140 mm)
5-3/4" (147 mm)
C 6-7/8" (174 mm)
4" (102 mm)
INDOOR MODEL
Female
24-7/8" (631 mm)
23-5/8" (600 mm)
17-3/4" (450 mm)
7" (180 mm)
6-1/4" (159mm)
Commercial Gas
Tankless Water Heater
INDOOR MODEL
4" (101 mm)
4" (102 mm)
Female
11-1/4" (285 mm)
22-1/2" (570 mm)
5-3/4" (147 mm)
Intake
2-5/8" (68 mm)
2-5/8" (65 mm)
Exhaust
10-3/4" (272mm)
HOT 4-3/4" (120 mm)
Drain port
6-3/4" (170 mm)
HOT 4-3/4" (120 mm)
120 VA
HO
COLD 5/8" (17 mm)
120 VAC 3" (77 mm)
GAS 5-3/4" (147 mm)
Condens ate drain port
7-1/2" (189 mm)
Condens ate drain port
7-1/2" (189 mm)
GAS 5-7/8" (147 mm)
120 VAC 3" (77 mm)
COLD 5/8" (17 mm)
C
1/2 (13 mm)
GAS 5-1/8" (131 mm)
HOT 5-1/2" (140 mm)
Drain port 6" (152 mm)
COLD 6-3/4" (172 mm)
120 VAC 6-7/8" (174 mm)
Condens ate drain port
7-7/8" (199 mm)
17-5/8" (448 mm)
Condensate drain port
6-1/4" (159 mm)
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T 5-1/2" (140 mm)
GAS 5-1/8" (131 mm)
OLD 6-3/4" (172 mm)
7-7/8" (199 mm)
OLD 6-3/4" (172 mm)
ain port
24-7/8" (631 mm)
ain port 6" (152 mm)
OUTDOOR MODEL
23-5/8" (600 mm)
OUTDOOR MODEL
17-3/4" (450 mm)
7" (180 mm)
4-1/2" (114 mm)
1-1/2" (37 mm)
3-5/8" (92 mm)
Commercial Gas
Tankless Water Heater
11-1/4" (285 mm)
11" (281 mm)
22-1/2" (570 mm)
HOT 4-3/4" (120 mm)
120 VAC 6-1/4" (159 mm)
Drain port
6-3/4" (170 mm)
HOT 4-3/4" (120 mm)
COLD 5/8" (17 mm)
GAS 5-3/4" (147 mm)
Condens ate drain port
7-1/2" (189 mm)
Condens ate drain port
7-1/2" (189 mm)
10-3/4" (272 mm)
1/2" (13 mm)
120 VAC 3" (77 mm)
GAS (131 mm)
HOT (140 mm)
Dr
C
Condens ate dr
7-7/8" (199 mm)
17-5/8" (448 mm)
HO
120 VAC 3" (77 mm)
120 VAC
6-1/4" (159 mm)
COLD 5/8" (17 mm)
C
Condensate drain port
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Commercial Gas
Tankless Water Heater
TANKLESS CONDENSING HIGH EFFICIENCY SPECIFICATIONS
The fully modulating, on-demand, condensing gas fired tankless water heater(s) shall be A.O. Smith model CT-199, having a maximum input
rating of 199,000 Btu/h and available in NG or LP. The heater shall have ¾ in. male NPT water and gas connections. The inlet gas supply
pressures shall be 4.0 in. WC (min.) up to 10.5 in. WC (max) for NG and 8.0 in. WC (min.) up to 14 in. WC (max.) for LP. The indoor heater(s)
shall incorporate an integrated temperature controller that will provide diagnostic information, fault history, and heater set temperature. The
outdoor heater(s) shall be factory supplied with a temperature remote, 100112572, that can be installed up to 400 ft. from the heater using
18 gauge (minimum) control wire. The temperature remote shall provide diagnostic information, fault history, and heater set temperature. The
heater(s) shall operate using 120 V / 60 Hz power source. The indoor heater(s) will incorporate a factory installed power cord.
The indoor heater(s) shall be vented with 3” or 4” diameter schedule 40 PVC, CPVC, ABS, or Category IV vent pipe with a length not to exceed
70 ft. (equivalent) for 3” vent or 100 ft. (equivalent) for 4” vent, terminating horizontally or vertically. The intake pipe may use material such
as PVC, ABS, aluminum, or Category IV pipe and cannot exceed 70 ft. (equivalent) for 3” vent or 100 ft. (equivalent) for 4” vent. The outdoor
heater(s) shall be constructed with an integral exhaust vent on the front of the heater.
The water heater(s) shall use a commercial-grade copper, fin tube primary heat exchanger with quick release brass or bronze waterways. The
secondary heat exchanger shall be constructed from stainless steel 316L. The heater(s) shall be controlled by an on-board solid-state printed
circuit board which uses the following factory installed components: thermistors to monitor water temperature and exhaust temperature; a flow
sensor to measure flow rate; a flame sensor to monitor combustion; an Air-Fuel Ratio Rod to measure and adjust air input in order to maintain
optimal combustion efficiency. The heater also consists of in-line fusing and surge absorbers for electrical surge protection, an electronic spark
igniter, aluminized stainless steel burners, hi-limit temperature switches to monitor water and exhaust temperatures, modulating gas valve,
dual freeze protection that will automatically fire the heater (indoor model only) and use heating blocks to protect the heat exchanger, and an
overheat cutoff fuse.
The heater(s) can manifold to Easy-Link up to 4 heaters to provide additional capacity. The Easy-Link controls shall be built onto the on-board
solidstate printed circuit board and does not require external controls. The linking control wire shall be supplied with the heater. The heater(s)
can use a Multi-Unit controller, 100112691, to manifold 5-20 heaters. The Easy-Link and Multi-Unit Controller shall modulate the system for the
most efficient performance. The Easy-Link and Multi-Unit Controller shall rotate the priority heater every 12 hours of operation time or 100 starts
for balanced duty/cycle operation.
The heater models are design certified by CSA according to ANSI Z21.10.3 · CSA 4.3, approved for sale in the United States, ENERGY STAR®
qualified, has a minimum uniform energy factor of 0.93, meets the energy efficiency requirements of the U. S. Department of Energy and ASHRAE
90.1, complies with SCAQMD Rule 1146.2 and other air quality districts with similar requirements for low NOx emissions of 14 ng/J or 20 ppm,
and shall be certified to NSF 5 standards.
For technical information call 800-527-1953. A. O. Smith Corporation reserves the right to make product changes or improvements without prior notice.
©June 2018 A. O. Smith Corporation. All Rights Reserved
www.hotwater.com | 800-527-1953 Toll-Free USA | A. O. Smith Corporation | 500 Tennessee Waltz Parkway | Ashland City, TN 37015
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AOSCG14006
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