A.O. Smith ATI-540P-N Tankless Natural Gas Water Heater 199,000 BTU with Integrated Recirc. Pump

Product Description

The A.O. SMITH ATI-540P-N is a tankless natural gas water heater using up to 199,000 BTU/hr to deliver an endless supply of hot water. It integrates a recirculation pump for instant hot water in residential applications. Built with commercial grade materials like marine-grade 316L stainless steel, it comes with an industry-leading warranty.

• Continuous flow rate up to 10.0 GPM
• Integrated recirculation pump
• Primary commercial-grade copper heat exchanger stabilizes outgoing water temperatures quicker

Product Highlights

This high-efficiency, condensing Ultra-Low NOx tankless water heater provides endless hot water while being environmentally friendly. It features integrated temperature controls and advanced diagnostics for simplified troubleshooting.

Product Information

Standard Information

• Brand: A.O. SMITH
• Manufacturer Part Number: ATI-540P-N
• Country of Origin: US

Technical Specifications

• Product Type: Tankless Heater
• Installation Type: Indoor Only
• Type: Condensing
• Gas Input: 15000-199000 BTU/h
• Fuel Type: Natural Gas
• Energy Factor: 0.93
• Gas Connection: 3/4"
• Water Connection: 3/4"
• Voltage: 120v
• Max Flow (GPM): 10
• Inlet Gas Pressure: 4.0-10.5"W.C
• Depth (Inches): 11-1/4"
• Height (Inches): 23.625"
• Width (Inches): 17-3/4"
• BTU (Max): 199000
• BTU (Min): 15000
• Vent Type: Direct Vent
• Application: Residential
• Includes: Pump
• Flow Rate at 40F Temp Rise (GPM): 9.5
• Flow Rate at 50F Temp Rise (GPM): 7.5
• Flow Rate at 60F Temp Rise (GPM): 6.3
• Flow Rate at 70F Temp Rise (GPM): 5.4
• UEF: 0.93
• Maximum BTUs: 199,000
• Power Source: GAS
• Water Connection Location: BOTTOM
• Emissions: Ultra-Low NOx
• ASME Certified: No
• GPM (@67 F Temp Rise): 5.8 GPM
• Minimum BTUs: 15,000
• Side Loop: No
• MPN: 100281161
• Manufacturer: AO Smith
• Series: ATI
• Material: Stainless Steel
• Water Heater Type: Residential
• Venting: Power Direct Vent
• Venting Type: Power Direct Vent
• Energy Star: Yes
• Width: 17-3/4"
• Height: 23-5/8"
• Depth: 11-1/4"
• Connection Size: 3/4"
• Activation GPM: 0.5
• Depth (in.): 11.25
• Duct Size: 4" Round
• Height (in.): 23.625
• Maximum Flow Rate: 9.5 GPM
• Maximum Gas Input: 199000
• Minimum Flow Rate: 4.9 GPM
• Minimum Gas Input: 15000
• Water Pressure (Max): 150 PSI
• Water Pressure (Min): 15 PSI
• Width (in.): 17.75
• Direct Vent: Yes
• Display Type: LCD
• Heating Technology: Condensing
• Indoor Installation: Yes
• Water Connection Type: NPT
• Altitude Certification: 10100 ft.
• Condensing: Yes
• Default Temperature: 120 "0F
• Frequency: 60 Hertz
• Ignition Type: Electric
• Max BTU Input: 199000
• ANSI Certification: Z21.10.3
• Certifications: AHRI, ANSI, CSA, NSF
• Collection: ProLine
• Low Lead Compliant: Yes
• Outdoor Approved: No
• Product Variation: Whole House Water Heater
• SCAQMD Compliant: Yes
• Title 20 Compliant: Yes
• Uniform Energy Factor: 0.95