A.O. Smith 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 (CT-199 MODELS ONLY)
• 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

Specifications Table

*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.

CT-199 MODEL Flow Rate vs. Temperature Rise

A graph showing the relationship between flow rate (GPM) and temperature rise (°F). The graph displays two lines:

• One line shows the flow rate for a set temperature of 125 °F (52 °C) or lower.
• Another line shows the flow rate for a set temperature of 130 °F (55 °C) or higher.

The flow rate decreases as the temperature rise increases. The maximum flow rate is 10.0 GPM.

Indoor Model Dimensions

Diagrams illustrating the dimensions of the indoor model:

• Main Unit View: Shows height, width, and depth with various connection points labeled (HOT, COLD, Drain port, 120 VAC, GAS, Condensate drain port).
• Side View: Details exhaust and intake pipe connections.
• Bottom View: Shows detailed connections for HOT, COLD, GAS, 120 VAC, and condensate drain port.

Key dimensions include:

• Height: 24-7/8" (631 mm)
• Width: 17-3/4" (450 mm)
• Depth: 11-1/4" (285 mm)
• Exhaust/Intake connections: 4" (102 mm)
• Gas connection: 5-3/4" (147 mm)
• Hot water connection: 4-3/4" (120 mm)
• Cold water connection: 5/8" (17 mm)

Outdoor Model Dimensions

Diagrams illustrating the dimensions of the outdoor model:

• Main Unit View: Similar to the indoor model, showing height, width, and depth with connection points.
• Side View: Details exhaust and intake pipe connections.
• Bottom View: Shows detailed connections for HOT, COLD, GAS, 120 VAC, and condensate drain port.

Key dimensions include:

• Height: 24-7/8" (631 mm)
• Width: 17-3/4" (450 mm)
• Depth: 11-1/4" (285 mm)
• Exhaust/Intake connections: 4-1/2" (114 mm)
• Gas connection: 5-3/4" (147 mm)
• Hot water connection: 4-3/4" (120 mm)
• Cold water connection: 5/8" (17 mm)

Tankless Condensing High Efficiency Specifications

The A.O. Smith model CT-199 is a fully modulating, on-demand, condensing gas-fired tankless water heater with a maximum input rating of 199,000 Btu/h, available for Natural Gas (NG) or Propane (LP). It features 3/4 in. male NPT water and gas connections.

Gas Supply Pressures:

• NG: 4.0 in. WC (min.) up to 10.5 in. WC (max)
• LP: 8.0 in. WC (min.) up to 14 in. WC (max.)

Indoor Heater Features: Integrated temperature controller providing diagnostic information, fault history, and heater set temperature. Includes a factory-installed power cord.

Outdoor Heater Features: Factory supplied with a temperature remote (model 100209924) that can be installed up to 400 ft. from the heater using 18 gauge control wire. The remote provides diagnostic information, fault history, and heater set temperature.

Power Requirements: Operates using a 120 V / 60 Hz power source.

Venting:

• Indoor heaters: Vented with 3” or 4” diameter schedule 40 PVC, CPVC, ABS, or Category IV vent pipe. Maximum length not to exceed 70 ft. for 3” vent or 100 ft. for 4” vent, terminating horizontally or vertically. Intake pipe may use PVC, ABS, aluminum, or Category IV pipe and cannot exceed 70 ft. for 3” vent or 100 ft. for 4” vent.
• Outdoor heaters: Constructed with an integral exhaust vent on the front of the heater.

Heat Exchanger:

• Primary: Commercial-grade copper, fin tube with quick release brass or bronze waterways.
• Secondary: Stainless steel 316L.

Control System: On-board solid-state printed circuit board with thermistors for water and exhaust temperature monitoring, a flow sensor, a flame sensor, and an Air-Fuel Ratio Rod for optimal combustion efficiency. Includes in-line fusing, surge absorbers, electronic spark igniter, hi-limit temperature switches, modulating gas valve, and dual freeze protection (indoor model only) with heating blocks.

Manifolding:

• Easy-Link: Up to 4 heaters can be manifolded without external controls.
• Multi-Unit Controller: For manifolding 5-20 heaters. Controllers modulate the system for efficient performance and rotate the priority heater every 12 hours or 100 starts for balanced duty/cycle operation.

Certifications and Compliance:

• CSA approved for sale in the United States and Canada.
• ENERGY STAR® qualified with a minimum uniform energy factor of 0.93.
• Meets U.S. Department of Energy and ASHRAE 90.1-2007 energy efficiency requirements.
• Complies with Ultra-Low NOx emissions of 14 ng/J or 20 ppm.
• Certified to NSF 5 Standards.

For technical information, contact A.O. Smith at 800-527-1953. A.O. Smith reserves the right to make product changes or improvements without prior notice.