A.O. Smith ATO-340HX3-N 180,000 BTU Condensing Ultra-Low NOx Outdoor Tankless Water Heater w/ X3 Scale Prevention (NG)

Product Description

The A.O. SMITH ATO-340HX3-N condensing ultra-low NOx outdoor tankless water heater with X3 scale prevention technology delivers continuous hot water while protecting against scale build-up. This tankless water heater uses up to 180,000 BTU/hr of natural gas. It is extremely efficient and complies with Ultra-Low NOx regulations.

• Maintains like-new performance for the life of the product vs. tankless models without X3.
• Commercial-grade copper heat exchanger stabilizes outgoing water temperatures quicker.
• Wall-mount design saves valuable space and allows for additional storage and flexibility.

Product Highlights

This A.O. Smith tankless water heater is an ideal choice for residential single-family applications with continuous hot water needs and hard water concerns.

Product Information

Standard Information

• Brand: A.O. SMITH
• Manufacturer Part Number: ATO-340HX3-N
• Country of Origin: US

Technical Specifications

• Product Type: Tankless Heater
• Type: Condensing
• Installation Type: Outdoor Only
• Fuel Type: Natural Gas
• Water Connection: 3/4"
• Gas Connection: 3/4 in NPT
• Inlet Gas Pressure: 4.0-10.5"W.C
• BTU (Max): 180000
• BTU (Min): 15000
• Gas Input: 15000-180000 BTU/h
• Voltage: 120v
• Max Flow (GPM): 8
• Height (Inches): 23.625"
• Depth (Inches): 11-1/4"
• Width (Inches): 17-3/4"
• Energy Factor: 0.94
• Vent Type: Power Direct Vent
• Application: Residential
• Flow Rate at 40F Temp Rise (GPM): 6.7
• Flow Rate at 50F Temp Rise (GPM): 6.1
• Flow Rate at 60F Temp Rise (GPM): 5
• Flow Rate at 70F Temp Rise (GPM): 4.3
• UEF: 0.94
• Maximum BTUs: 180,000
• Power Source: GAS
• Water Connection Location: BOTTOM
• Emissions: Ultra-Low NOx
• ASME Certified: No
• Digital Display: Yes
• Fuel Source: NATURAL
• GPM (@67 F Temp Rise): 5.3 GPM
• Minimum BTUs: 13,000
• Commercial/Residential/Dual: Commercial/Residential
• Condensing/Non Condensing: Condensing
• Flow Rate: 8 gpm
• Heating Capacity: 180000 Btu/hr
• Ignition Type: Electronic Spark
• Pressure Rating: 15 to 150 psi
• Series: ATI-340HX3-N
• Vent Size: 3/4 in
• Application Type: For Residential
• Water Connection Size: 3/4"
• Heat Exchanger: Commercial Grade Copper
• Secondary Heat Exchanger: Stainless Steel
• ENERGY STAR Certified: Yes
• Remote Control: Yes
• Technology: Condensing
• Gas Type: NG Natural Gas
• Maximum Flow Rate: 8 GPM
• Maximum Gas Input: 180000
• Minimum Flow Rate: 4.3 GPM
• Minimum Gas Input: 15000
• Altitude Certification: 6000 ft.
• Frequency: 60 Hertz
• Max BTU Input: 180000
• Uniform Energy Factor: 0.94
• Duct Size: 3" Round, 4" Round