A.O. Smith ATO-540P-N Tankless Water Heater 199,000 BTU

Product Description

The A.O. SMITH ATO-540P-N outdoor tankless water heater uses up to 199,000 BTU/hr of natural gas to deliver an endless supply of hot water. The 540P series integrates a recirculation pump to provide instant hot water in residential applications with dedicated recirculation lines. It is built with commercial grade materials like marine-grade 316L stainless steel giving it an industry-leading warranty.

• ENERGY STAR certified
• Continuous flow rate up to 10.0 GPM
• Integrated recirculation pump

Product Highlights

This condensing tankless water heater provides endless hot water while being environmentally friendly. It includes a wall mount temperature remote controller and advanced diagnostics to simplify troubleshooting.

Product Information

Standard Information

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

Technical Specifications

• Product Type: Tankless Heater
• Installation Type: Outdoor Only
• Type: Condensing
• Gas Input: 15000-199000 BTU/h
• Fuel Type: Natural Gas
• Gas Connection: 3/4"
• Water Connection: 3/4"
• Voltage: 120v
• Energy Factor: 0.95
• Max Flow (GPM): 10
• Inlet Gas Pressure: 4.0-10.5"W.C
• Height (Inches): 23.625"
• Depth (Inches): 11-1/4"
• Width (Inches): 17-3/4"
• BTU (Max): 190000
• BTU (Min): 15000
• Vent Type: Outdoor (No Venting)
• 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: 0.95
• Maximum BTUs: 199,000
• Power Source: GAS
• Water Connection Location: BOTTOM
• Emissions: Ultra-Low NOx
• ASME Certified: No
• Destination Country: US
• ENERGY STAR Certified: Yes
• GPM (@67 F Temp Rise): 5.8 GPM
• Product Tier: ProLine XE
• Side Loop: No
• MPN: ATO-540P-N
• Manufacturer: AO Smith
• Series: ATO
• BTU Input: 199,000
• Material: Stainless Steel
• Water Heater Type: Residential
• Venting: Power Direct Vent
• Venting Type: Power Direct Vent
• Energy Star: Yes
• Special Feature: Overheat Protection
• Wattage: 195.6 watts
• Max. Amps: 5.0
• Max. Input Rate for Gas Products (Btu/hr): 199000
• Maximum Gallons Per Minute: 5.8 (High-Usage)
• Draw Pattern (Intended Usage): High-Usage
• Therms/year for Natural Gas: 178
• Vent Size 1 (inches): 3
• Water Heater Depth (inches): 11.0
• Water Heater Height (inches): 22.0
• Water Heater Width (inches): 18.0
• ENERGY STAR Unique ID: 2408683