Weil-McLain LGB Series Commercial Boiler Installation Chicago
Weil-McLain · Chicago Commercial Installation
Weil-McLain LGB Series
Large cast-iron commercial gas hot-water boiler. 82% AFUE, Category I B-Vent, 210K–700K BTU/hr — built for Chicago's largest multi-unit buildings, schools, and commercial facilities.
The Weil-McLain LGB Series is a large sectional cast-iron commercial gas hot-water boiler built for Chicago's largest multi-unit buildings, schools, hospitals, and commercial facilities. With eleven models ranging from 210,000 to 700,000 BTU/hr, the LGB covers the full range of large commercial heating loads.
The LGB Series uses standard Category I / B-Vent venting, making it compatible with most existing chimney configurations in Chicago commercial buildings. Its sectional cast-iron design allows precise BTU sizing and easy field replacement of individual sections — reducing downtime and repair costs.
D's Air & Heating, Inc. installs the LGB Series throughout Chicago and the southwest suburbs. We handle all City of Chicago commercial mechanical permits, system piping, controls, and startup — and register your Weil-McLain warranty before we leave the job.
Why D's Air & Heating, Inc. Installs the LGB Series
Large Cast-Iron Sections
Sectional cast-iron construction allows precise BTU sizing from 210,000 to 700,000 BTU/hr — covers Chicago's largest multi-unit buildings.
82% AFUE
Reliable atmospheric efficiency with proven long-term performance in Chicago's demanding commercial heating environments.
Category I / B-Vent
Compatible with standard B-Vent and most existing chimney configurations in Chicago commercial buildings.
Gas & Oil Compatible
The LGB Series accepts both natural gas and oil burners — ideal for Chicago buildings converting from oil to gas.
210K–700K BTU/hr
Eleven models from 210,000 to 700,000 BTU/hr cover the full range of large Chicago commercial heating loads.
Weil-McLain Warranty
Backed by Weil-McLain's limited warranty. D's Air & Heating, Inc. registers your warranty at startup.
LGB Series — Models & Specs
| Model | Efficiency | Input BTU/hr | Venting | Installed Price |
|---|---|---|---|---|
| LGB-6S | 82% AFUE | 210,000 | Category I / B-Vent | Call for Pricing |
| LGB-7S | 82% AFUE | 245,000 | Category I / B-Vent | Call for Pricing |
| LGB-8S | 82% AFUE | 280,000 | Category I / B-Vent | Call for Pricing |
| LGB-9S | 82% AFUE | 315,000 | Category I / B-Vent | Call for Pricing |
| LGB-10S | 82% AFUE | 350,000 | Category I / B-Vent | Call for Pricing |
| LGB-11S | 82% AFUE | 385,000 | Category I / B-Vent | Call for Pricing |
| LGB-12S | 82% AFUE | 420,000 | Category I / B-Vent | Call for Pricing |
| LGB-14S | 82% AFUE | 490,000 | Category I / B-Vent | Call for Pricing |
| LGB-16S | 82% AFUE | 560,000 | Category I / B-Vent | Call for Pricing |
| LGB-18S | 82% AFUE | 630,000 | Category I / B-Vent | Call for Pricing |
| LGB-20S | 82% AFUE | 700,000 | Category I / B-Vent | Call for Pricing |
*Local taxes may apply. Financing available on approved credit.
Other Weil-McLain Commercial Series
Weil-McLain Boiler Installation & Service Experts
D's Air & Heating proudly provides professional Weil-McLain boiler installation, replacement, repair, maintenance, and emergency service throughout Chicago and surrounding communities. Weil-McLain is recognized as one of the most trusted names in the boiler industry, delivering reliable heating solutions for residential, commercial, steam, and hot water applications.
Our experienced boiler technicians install and service a wide range of Weil-McLain commercial equipment. Whether you need a new Weil-McLain boiler installation Chicago businesses rely on, complete boiler replacement, annual maintenance, or emergency repair service, D's Air & Heating has the expertise to keep your commercial heating system operating safely and efficiently.
From small commercial buildings to large boiler plant projects, D's Air & Heating delivers quality workmanship, expert system design, and dependable customer support backed by industry-leading Weil-McLain technology and warranty protection. Our Weil-McLain boiler repair Chicago commercial customers trust us for fast diagnostics, genuine parts, and lasting fixes.
Contact D's Air & Heating today at (773) 940-0965 to schedule your free estimate for Weil-McLain boiler installation, replacement, maintenance, or repair services.
Ready to Replace Your Commercial Boiler?
D's Air & Heating, Inc. installs Weil-McLain LGB Series boilers throughout Chicago and the southwest suburbs. Call now or book online.