• ProLine® XE Combi Boiler

    The first-ever residential combination boiler from A. O. Smith comes with an industry-leading 4.8 gal/min domestic hot water delivery and 95% AFUE, as well as a superior space heating performance with up to 74% more heating capacity than other combination boilers. Easy installation makes the ProLine® XE Combi Boiler a great solution for a wide variety of residential applications.

    Available in three sizes: 110,000, 150,000 and 199,999 BTU/hr


Where to Buy

Where to Buy

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A.O. Smith products are available through independent plumbing contractors.

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  • Preheat Function

    Uses an integrated recirculation pump to ensure that domestic hot water reaches its target temperature faster


  • Anticipated Pre-Purge

    Allows the boiler to reignite almost instantly during times of frequent use, preventing the cold water sandwich effect


  • Air Handler Interlock

    Prevents cool air delivery while the boiler is in domestic hot water mode to increase user comfort


  • Advanced Electronic Control

    The ProLine® XE Combi Boiler also comes with an advanced electronic control. This smart control includes an LCD display, making navigation simple while providing diagnostic and system information in real words—not codes. The first time you turn on the combi boiler, you’ll be led through our Set Up Wizard for quick and easy programming