Heating perfection and long-term protection

Every Ultra boiler is hydrostatically tested to ASME standards and test fired

Backed by Weil-McLain quality and a warranty that provides peace of mind

Unrivaled technical and field sales support

From North America's leading boiler manufacturer with over 135 years of proud history

Designed to operate in low temperature condensing applications

Outdoor reset and domestic hot water priority

Modulates with 5:1 turn-down ratio

High grade stainless steel burner features quiet operation

U-Control gives you the power for easy set-up and maintenance

Back-lit LCD display and simple programming buttons make entering and receiving information easy

Energy Star® Rated

The internal microprocessor provides enhanced operating parameters and tighter differentials for precise sensing and faster heating response to optimize performance

Uses a thermopile to generate the power needed to operate the electronic gas control without requiring an external power source

he electronic gas control incorporates an LED status indicator that monitors system operation and service diagnostics

Patented eco-friendly burner design

Makes lighting pilot fast and easy with one-hand push-button spark ignition

Factory-installed for faster installation

Uses a standard female hose fitting that allows for fast and easy draining during maintenance

Lead-Free

DIRECT VENT DESIGN-One-pipe, dual-channel closed system draws all make-up air from outside the home, eliminating problems caused by insufficient indoor ventilation and is FVIR compliant

Horizontal air intake and venting on all models up to 80 inches from outside wall with no electrical power needed

INTELLIGENT CONTROL LOGIC-The internal microprocessor provides enhanced operating parameters and tighter differentials for precise sensing and faster heating response to optimize performance

Uses a thermopile to generate the power needed to operate the electronic gas control without requiring an external power source

The electronic gas control incorporates an LED status indicator that monitors system operation and service diagnostics

GREEN CHOICE® GAS BURNER-Patented eco-friendly burner design reduces NOx emissions up to 33% and complies with Low-NOx emission requirements of less than 40 ng/J

SELF-CLEANING DIP TUBE-Helps reduce lime and sediment buildup and maximizes hot water output

Made from long-lasting PEX cross-linked polymer

Co regard ANODE ROD-Our anode rods have a stainless steel core that extends the life of the anode rod allowing superior tank protection far longer than standard anode rods

PUSH BUTTON PIEZO igniter-Makes lighting pilot fast and easy with one-hand pushbutton spark ignition

Lead-Free

Energy Star® Qualified Automatic Flue Damper Increases Efficiency as it Automatically Opens and Closes to Reduce Heat Loss in the Standby Mode

Intelligent Control Logic Provides Enhanced Operating Parameters and Tighter Differentials for Precise Sensing and Faster Heating Response to Optimize Performance

Dynaclean Diffuser Dip Tube Reduces Lime and Sediment Buildup and Maximizes Hot Water Output

Green Choice® Gas Burner

Enhanced-Flow Brass Drain Valve

Designed for Easy Operation

Energy Star® Qualified

Lead-Free

Energy Star® Qualified Automatic Flue Damper Increases Efficiency as it Automatically Opens and Closes to Reduce Heat Loss in the Standby Mode

Intelligent Control Logic Provides Enhanced Operating Parameters and Tighter Differentials for Precise Sensing and Faster Heating Response to Optimize Performance

Dynaclean Diffuser Dip Tube Reduces Lime and Sediment Buildup and Maximizes Hot Water Output

Green Choice® Gas Burner

Enhanced-Flow Brass Drain Valve

Designed for Easy Operation

Energy Star® Qualified

Lead-Free