Ao Smith 100344527 ProLine XE Ultra-Low NOx Indoor Natural Gas Tankless Water Heater 199,000 BTU (21.69 L x 16.19 W x 36.75 H)

Product Description

AO Smith 100344527 is a ProLine XE ultra-low NOx indoor natural gas tankless water heater with X3 Technology, rated at 199,000 BTU to provide on-demand hot water for residential and commercial applications. The unit measures 21.69 x 16.19 x 36.75 inches, weighs 72.9 lb, and supports up to 10 gallons per minute flow. It is designed for indoor installation with Cat IV venting options and a compact wall-mount form factor.

• X3 Technology for scale prevention and improved combustion efficiency; ultra-low NOx emissions
• 199,000 BTU capacity with up to 10 GPM maximum flow; designed for continuous on-demand hot water
• Compact indoor wall‑mount design, dimensions 21.69 x 16.19 x 36.75 in; 72.9 lb; Cat IV venting options

Product Highlights

Ultra-low NOx tankless natural gas heater, 199,000 BTU, X3 scale prevention, indoor Cat IV venting

Product Information

Standard Information

• Brand: AO SMITH
• Manufacturer Part Number: 100344527

Technical Specifications

• Brand: AO Smith
• Manufacturer Part Number: 100344527
• Model/Series: ProLine XE
• Product Type: Natural Gas Tankless Water Heater
• BTU Rating: 199,000 BTU
• BTU Input Range: 15,000 - 199,000 BTU
• Maximum Flow Rate: 10 GPM
• Condensing: Yes
• Uniform Energy Factor (UEF): 0.93
• X3 Technology: X3 scale prevention
• Heat Exchangers: Primary commercial-grade copper; secondary 316L stainless steel
• Venting/Configuration: CAT-IV RM/OS (room-sealed/outdoor)
• Vent Type: Power direct vent
• Fuel Type: Natural Gas
• Power Source: Gas (120V electrical for controls/ignition)
• Voltage: 120V
• Water Connection Size: 3/4 in
• Pressure Range: 15 - 150 psi
• Dimensions (L x W x H): 21.69 in x 16.19 in x 36.75 in
• Weight: 72.9 lb
• UPC: 671657270148
• Certifications: CSA; ANSI Z21.10.3; Energy Star (manufacturer-claimed)