ACCESSORIES Pipe Cover Neutralizer Kit Isolation Valve Kits Concentric Termination PRODUCT PRESERVERS ANTI-SCALE SYSTEM

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1 TANKLESS HIGH EFFICIENCY CONDENSING MODELS Ultra-Low NOx Gas with Condensing Technology featuring an unprecedented.95 Energy Factor which lowers operating costs and is environmentally friendly ATI and ATO24-54H FEATURES CONTINUOUS MAXIMUM FLOW RATES UP TO 1. GPM ENERGY STAR QUALIFIED AVAILABLE IN NATURAL GAS OR PROPANE (LP) ATI 54H & AT 54H CAN BE USED IN BOTH RESIDENTIAL AND COMMERCIAL APPLICATIONS INDOOR MODEL - INCLUDES INTEGRATED TEMPERATURE CONTROLS 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 DURABLE HEAT EXCHANGER Primary Heat Exchanger is constructed of HRS35, a Commercial-Grade Copper that is more resilient to erosion. HRS35 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 EASY-LINK UP TO 4 UNITS (54H MODELS ONLY) With no additional parts or accessories needed MULTI-LINK UP TO 2 UNITS (54H 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 7 Feet or 4" PVC Venting up to 1 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 IV Stainless Steel venting can also be used ACCESSORIES Pipe Cover Neutralizer Kit Isolation Valve Kits Concentric Termination PRODUCT PRESERVERS ANTI-SCALE SYSTEM WARRANTY 15-year limited warranty on heat exchanger in residential applications 1-year limited warranty on heat exchanger in commercial applications 5-year limited warranty on all parts INDOOR MODELS OUTDOOR MODELS ANSI Z CSA model only A. O. Smith Corporation 5 Tennessee Waltz Parkway Ashland City, TN Toll-free USA Page 1 of 6 Revised February 214

2 TANKLESS HIGH EFFICIENCY CONDENSING MODELS MODEL NUMBER FUEL TYPE GAS CONSUMPTION INPUT MINIMUM BTU/H MAXIMUM BTU/H MINIMUM W.C. INLET GAS PRESSURE MAXIMUM W.C. ENERGY FACTOR All dimensions are in inches psi Water Pressure. 4 psi or above is recommended for maximum flow. *Current numbers based on factory testing;.5 GPM for activation;.4 GPM required for continuous fire after initial ignition. Indoor models are certified from sea level to 1,1 ft. elevations. In accordance with ANSI Z21.1.3, CO emission does not exceed 4 PPM for normal input. The manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligation. MAX GPM* HOT/COLD AND GAS CONN. DIMENSIONS IN INCHES A HEIGHT INDOOR ATI-24H-N Natural 15, 16, /4 NPT 23-5/8 17-3/4 11-1/4 58 ATI-24H-P Propane 13, 16, /4 NPT 23-5/8 17-3/4 11-1/4 58 ATI-34H-N Natural 15, 18, /4"NPT 23-5/8 17-3/4 11-1/4 58 ATI-34H-P Propane 13, 18, /4"NPT 23-5/8 17-3/4 11-1/4 58 ATI-54H-N Natural 15, 199, /4"NPT 23-5/8 17-3/4 11-1/4 59 ATI-54H-P Propane 13, 199, /4"NPT 23-5/8 17-3/4 11-1/4 59 OUTDOOR ATO-24H-N Natural 15, 16, /4 NPT 23-5/8 17-3/4 11-1/4 58 ATO-24H-P Propane 13, 16, /4 NPT 23-5/8 17-3/4 11-1/4 58 ATO-34H-N Natural 15, 18, /4"NPT 23-5/8 17-3/4 11-1/4 58 ATO-34H-P Propane 13, 18, /4"NPT 23-5/8 17-3/4 11-1/4 58 ATO-54H-N Natural 15, 199, /4"NPT 23-5/8 17-3/4 11-1/4 59 ATO-54H-P Propane 13, 199, /4"NPT 23-5/8 17-3/4 11-1/4 59 B WIDTH C DEPTH UNIT WEIGHT (LBS) For Technical Information call A. O. Smith Corporation reserves the right to make product changes or improvements without prior notice. Revised February 214 Page 2 of 6

3 INDOOR MODEL 4" (12 mm) Female 17-3/4" (45 mm) 7" (18 mm) 4" (11 mm) 4" (12 mm) Female 11-1/4" (285 mm) 5-3/4" (147 mm) 24-7/8" (631 mm) 23-5/8" (6 mm) 6-1/4" (159mm) 22-1/2" (57 mm) Exhaust 2-5/8" (65 mm) Intake 2-5/8" (68 mm) 1-3/4" (272mm) HOT 4-3/4" (12 mm) Drain port 6-3/4" (17 mm) COLD 5/8" (17 mm) 12 VAC 3" (77 mm) GAS 5-3/4" (147 mm) 1/2 (13 mm) GAS 5-1/8" (131 mm) HOT 5-1/2" (14 mm) Drain port 6" (152 mm) 12 VAC 6-7/8" (174 mm) HOT 4-3/4" (12 mm) GAS 5-7/8" (147 mm) 12 VAC 3" (77 mm) HOT 5-1/2" (14 mm) 12 VAC 6-7/8" (174 mm) GAS 5-1/8" (131 mm) 5-3/4" (147 mm) 17-5/8" (448 mm) COLD 5/8" (17 mm) 6-1/4" (159 mm) For Technical Information call A. O. Smith Corporation reserves the right to make product changes or improvements without prior notice. Revised February 214 Page 3 of 6

4 OUTDOOR MODEL 17-3/4" (45 mm) 7" (18 mm) 4-1/2" (114 mm) 11-1/4" (285 mm) 11" (281 mm) 1-3/4" (272 mm) HOT 4-3/4" (12 mm) 12 VAC 6-1/4" (159 mm) Drain port 6-3/4" (17 mm) COLD 5/8" (17 mm) GAS 5-3/4" (147 mm) HOT 4-3/4" (12 mm) 17-5/8" (448 mm) HOT 5-1/2" (14 mm) 12 VAC 3" (77 mm) GAS 5-1/8" (131 mm) 24-7/8" (631 mm) 23-5/8" (6 mm) 3-5/8" (92 mm) 1-1/2" (37 mm) 22-1/2" (57 mm) 1/2" (13 mm) 12 VAC 3" (77 mm) GAS (131 mm) HOT (14 mm) Drain port 6" (152 mm) 12 VAC 6-1/4" (159 mm) COLD 5/8" (17 mm) For Technical Information call A. O. Smith Corporation reserves the right to make product changes or improvements without prior notice. Revised February 214 Page 4 of 6

5 FLOW RATE vs TEMPERATURE RISE 24H 34H Flow Rate vs. Temperature Rise Flow Rate vs. Temperature Rise Temperature Rise ( F) Temperature Rise ( F) 54H Flow Rate vs. Temperature Rise Temperature Rise ( F) ( F) Set temperature 125 F (52 C) or lower Set temperature 13 F (55 C) or higher For Technical Information call A. O. Smith Corporation reserves the right to make product changes or improvements without prior notice. Revised February 214 Page 5 of 6

6 PRESSURE LOSS Pressure Loss (psi) 24H 34H Pressure Loss Pressure Loss Pressure Loss (psi) Head (Feet) Pressure Loss (psi) 54H Pressure Loss Flow Flow Rate rate (GPM) Set temperature 125 F (52 C) or lower Set temperature 13 F (55 C) or higher Head (Feet) Head (Feet) Specification Water heater(s) shall be Model as manufactured by A. O. SmithWater Heaters, shall be a copper coil integral fin and tube construction with quick release brass or bronze waterways. Heater(s) will be factory assembled and tested. The heater shall be vented with 3 or 4 Schedule 4 PVC, CPVC, or ABS vent pipe, or stainless steel Category III vent pipe at a distance not to exceed 7 (equivalent) for 3 vent or 1 (equivalent) for 4 vent, terminating vertically or horizontally as prescribed. Intake air pipe may be of such material as ABS, PVC, galvanized B-Vent, corrugated aluminum or stainless steel, or Category IV stainless steel not to exceed 7 (equivalent) for 3 vent or 1 (equivalent) for 4 vent. The heater(s) shall be controlled by an onboard solid-state printed circuit board monitoring incoming and outgoing temperatures with factory installed thermistors, sensing and controlling flow rate to set point temperature, controlling both air and gas mixture inputs to maintain thermal combustion efficiency. The heater(s) shall also consist of inline fusing, a spark ignition and sensor system, aluminized stainless steel burners, an air-fuel ratio sensor, a hi-limit temperature switch, modulating and proportional gas valves, a freeze protection sensor with ceramic heating blocks, and an overheat cutoff fuse. The water heater(s) shall be CSA listed, exceed the energy efficiency requirements of ASHRAE 9.1b-1992, and shall comply with SCAQMD Rule Ultra-Low NOx Standards. For Technical Information call A. O. Smith Corporation reserves the right to make product changes or improvements without prior notice. A. O. Smith Corporation 5 Tennessee Waltz Parkway Ashland City, TN Toll-free USA Page 6 of 6 Revised February 214

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