Up to 93.9% Thermal Efficiency

Up to 94.7% Combustion Efficiency

Modulating Burner with 5:1 Turndown Ratio

Fast and Easy Out of the Box Installation

Lightweight, Compact Design Requires Minimal Clearance

Low Nox Certified < 20 PPM

CSD-1 Compliant is Standard Feature

Approved for Common Venting

PVC, CPVC, PP or SS (AL29-4C) Materials Approved for Direct Vent and Direct Exhaust

Fully Customizable Outdoor Reset Curve

Lead/Lag Capability up to 8 Boilers with Lead Boiler Rotation

Remote Connection Using Standard Modbus or Optional BACNET/Lonworks

High limit temperature control with maximum 200 degree F manual reset

Sectional Aluminum Block

Stainless Steel Burner with Woven steel fiber mesh

Compact Design and Lightweight

Completely Wired, Programmed, Tested and Factory Assembled

Controls Set Up Wizard

Minimal Clearance Requirements

Efficiency Above 94%

Intuitive Interface

Advanced Boiler Controls

Non-Metallic (Composite) Heat Exchanger Base

3.5 Inch LCD Screen

Intuitive, color coded display

Express set up or fully customizable options

Preset typical heating systems

0 to 10 VDC analog output signal to modulate a lag boiler in a hybrid boiler system

Up to 8 boiler cascading and lead/lag rotation

Multiple boiler operation with up to 24 circulators

Zone Stacking-zone and priority options for up to 24 programmable zones

Smart Sequencing

Alarms and advanced diagnostics

High limit and modulating temperature control

Boiler staging algorithm optimized for variable primary only systems

Outdoor temperature reset and warm weather shutdown

Boiler schedule and contractor information

Low water protection

High temperature limit with manual reset

Ignition control

Multiple inputs with assignable priority

Up to 93.9% Thermal Efficiency

Up to 94.7% Combustion Efficiency

550000 to 750000 BTU/HR

Modulating Burner with 5:1 Turndown Ratio

Fast and Easy Out of the Box Installation

Lightweight, Compact Design Requires Minimal Clearance

Low Nox Certified < 20 PPM

CSD-1 Compliant is Standard Feature

Approved for Common Venting

PVC, CPVC, PP or SS (AL29-4C) Materials Approved for Direct Vent and Direct Exhaust

Fully Customizable Outdoor Reset Curve

Lead/Lag Capability up to 8 Boilers with Lead Boiler Rotation

Remote Connection Using Standard Modbus or Optional BACNET/Lonworks

High limit temperature control with maximum 200 degree F manual reset

Sectional Aluminum Block

Stainless Steel Burner with Woven steel fiber mesh

Compact Design and Lightweight

Completely Wired, Programmed, Tested and Factory Assembled

Controls Set Up Wizard

Minimal Clearance Requirements

Efficiency Above 94%

Intuitive Interface

Advanced Boiler Controls

Non-Metallic (Composite) Heat Exchanger Base

3.5 Inch LCD Screen

Intuitive, color coded display

Express set up or fully customizable options

Preset typical heating systems

0 to 10 VDC analog output signal to modulate a lag boiler in a hybrid boiler system

Up to 8 boiler cascading and lead/lag rotation

Multiple boiler operation with up to 24 circulators

Zone Stacking-zone and priority options for up to 24 programmable zones

Smart Sequencing

Alarms and advanced diagnostics

High limit and modulating temperature control

Boiler staging algorithm optimized for variable primary only systems

Outdoor temperature reset and warm weather shutdown

Boiler schedule and contractor information

Low water protection

High temperature limit with manual reset

Ignition control

Multiple inputs with assignable priority

91% AFUE efficient

Durable cast iron primary heat exchanger

Condensing stainless steel secondary heat exchanger

Unique 7 pass heat exchanger design maximizes heat transfer

Vents with PVC

Multiple ventilation options (direct vent, direct exhaust, concentric)

Easy conversion to propane

Maximum Heat Exchanger performance

Reliable Boiler Design

Proven Control Strategy

Smart Circulator Strategy

Full product line to satisfy every application

Every residential gas 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

Over a 130 year proud history and North Americas leading boiler manufacturer

Exceeds Energy Star requirements with 91% efficiency

Boiler sections made from recycled metals

Lower emission levels than most boilers

Energy Star® Rated