Time proven cast iron design for durability and reliability

Optimum venting flexibility for homes with existing chimneys

Industry standard tapping locations, allows easy, direct replacement for thousands of existing boiler installations

Solid, reliable, American-made cast iron heat exchanger, designed to promote turbulent water flow within the section for efficient heat transfer

Consists of the Intelligent Hydronic Control and IQ Option Panel

Intuitive self-diagnostics

Combines high limit, relay and ignition functions into a single module

Two customizable integrated switching relays for easy addition of additional heating zone or indirect water heater

Energy saving thermal purge, which works by circulating residual warm water (140 Deg or above) in the heating system before firing the boiler

Enables the easy plug and play installation of optional features such as outdoor reset, LWCO and high limit

Limited Lifetime Warranty

Time proven cast iron design for durability and reliability

Optimum venting flexibility for homes with existing chimneys

Industry standard tapping locations, allows easy, direct replacement for thousands of existing boiler installations

Solid, reliable, American-made cast iron heat exchanger, designed to promote turbulent water flow within the section for efficient heat transfer

Consists of the Intelligent Hydronic Control and IQ Option Panel

Intuitive self-diagnostics

Combines high limit, relay and ignition functions into a single module

Two customizable integrated switching relays for easy addition of additional heating zone or indirect water heater

Energy saving thermal purge, which works by circulating residual warm water (140 Deg or above) in the heating system before firing the boiler

Enables the easy plug and play installation of optional features such as outdoor reset, LWCO and high limit

Limited Lifetime Warranty

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