A.o. Smith 100374812 Condensing Tankless Water Heater 199K Btu

Product Description

The A.O. SMITH 100374812 is a premium condensing natural gas tankless water heater rated at 199,000 BTU/h input with a maximum flow rate of 10.5 gallons per minute. Part of the Adapt line, it delivers on-demand hot water without a storage tank, making it well suited for high-demand residential applications. The unit incorporates X3 Scale Prevention Technology, which protects the heat exchanger from mineral buildup and can extend heat exchanger service life by up to 300 percent compared to an unprotected unit. A Uniform Energy Factor of 0.95 and ENERGY STAR certification confirm efficient operation. Licensed plumbers and HVAC technicians typically supply and install this unit.

This tankless water heater is designed for residential installation where high hot-water demand and space efficiency are priorities. The unit operates on natural gas and is field convertible to liquid propane using an included conversion kit. It can be installed indoors or outdoors; an Outdoor Vent Cap Kit is available separately. A built-in control display allows setting and reviewing up to two recirculating schedules and checking heater status and error codes. Optional remote management kits, sold separately, allow temperature adjustment and recirculation pump activation from a remote location. The unit complies with Ultra-Low NOx regulations, making it appropriate for air-quality-regulated jurisdictions.

Key Features

• 199,000 BTU/h input rating delivers up to 10.5 GPM maximum flow rate
• X3 Scale Prevention Technology protects heat exchanger from mineral deposits
• ENERGY STAR certified with a Uniform Energy Factor of 0.95
• Field convertible from natural gas to liquid propane with included kit
• Built-in control display supports up to two recirculating schedules and error code review
• Compliant with Ultra-Low NOx regulations for restricted-emission regions
• Suitable for indoor or outdoor installation with optional vent cap kit

Compatibility

Designed as an on-demand replacement or new-installation condensing tankless water heater for residential natural gas or liquid propane systems requiring up to 199,000 BTU/h input capacity and up to 10.5 GPM flow rate.

Installation Notes

Installation must be performed by a licensed plumber or qualified technician in accordance with local plumbing codes and the manufacturer instructions. Shut off the gas supply and disconnect electrical power before making any connections. The unit requires a 120-volt power source and proper venting sized to the manufacturer specifications; verify vent material compatibility before installation. Do not operate on fuel types other than those specified without completing the included field conversion procedure.

Technical Specifications

• BTU Input: 199,000 BTU/h
• Max Flow Rate: 10.5 GPM
• Voltage: 120 volts
• Uniform Energy Factor (UEF): 0.95
• Fuel Type: Natural Gas (field convertible to Liquid Propane)
• Height: 41.8 inches
• Width: 16.53 inches
• Weight: 120 pounds
• Warranty: 15 Years
• UPC: 671657288594

Standard Information

• Brand: A.O. SMITH
• Manufacturer Part Number: 100374812