Authorized Weil-McLain Dealer Serving Chicago Since 2009
Weil-McLain LGB Series 3 Commercial Steam Boilers
Chicago's commercial steam boiler specialists. D's Air & Heating installs the full Weil-McLain LGB Series 3 lineup — from the LGB-4R to the LGB-20 — with complete installed pricing, professional steam piping, and full commissioning.
Why D's Air & Heating, Inc. for LGB Series 3 Steam
We specialize in large commercial cast-iron steam boiler replacement and installation throughout Chicago and the surrounding area. Every LGB Series 3 package includes secondary commercial safety controls, model-specific near-boiler steam piping, removal of the existing boiler, and full startup and commissioning.
Weil-McLain LGB Series 3 Commercial Steam Boiler
Full Series 3 lineup — 350,000 to 2,470,000 BTUH input. We install every model size.
Weil-McLain LGB Series 3 Commercial Steam Boiler
Every package includes applicable secondary commercial safety controls per code and AHJ requirements.
Weil-McLain LGB Series 3 Commercial Steam Boiler
Near-boiler piping sized and configured per current Weil-McLain Series 3 manufacturer requirements for each model.
Weil-McLain LGB Series 3 Commercial Steam Boiler
Starting prices include equipment, controls, piping, removal, labor, startup, and commissioning.
Weil-McLain LGB Series 3 Commercial Steam Boiler
Steam boiler sizing based on connected EDR and proper system evaluation — not square footage alone.
Weil-McLain LGB Series 3 Commercial Steam Boiler
D's Air & Heating has served Chicago's commercial and multi-unit market since 2009. IL License #2183457.
Weil-McLain LGB Series 3
Commercial Gas-Fired Boiler
The LGB Series 3 is Weil-McLain's flagship large commercial cast-iron boiler, available in steam and hot water configurations. Built for multi-unit residential buildings, schools, and large commercial facilities throughout Chicago.
- Cast-iron sectional construction for long service life
- Available in steam and hot water configurations
- Input range: 350,000 – 2,470,000 BTUH
- Natural gas or propane firing
- Atmospheric burner design — proven reliability
- Model-specific near-boiler piping per WM requirements
Professional Steam Boiler Sizing Available
Steam boiler sizing must be based on connected radiation (EDR) and proper system evaluation — not building square footage alone. D's Air & Heating provides professional steam boiler sizing for every LGB Series 3 project.
WM-LGB-6S
Pricing
Purchase Price
$31,933.43
Installed Combo Price
Contact for Installation Pricing
Prices are final customer-facing prices. D's Air & Heating does not display dealer cost, markup, or internal pricing formulas.
Equipment Package
- WM-LGB-6S Commercial Steam Boiler
- MH-L4079B1033 Manual-Reset Pressuretrol Limit
- MM-101A 120V Water Feeder
- HY-550 120V Manual-Reset/Test Probe LWCO
- HY-EL1214-P Extended Shank
- (2) 12" 24-Gauge 90° Vent Elbows
- (2) 12" 24-Gauge 2' Vent Pipes
LGB Series 3 — All Models & Starting Installed Prices
Starting complete installed prices include equipment, secondary commercial safety controls, model-specific steam piping, removal, labor, startup, and commissioning. Final price subject to field verification.
| Model | Input | Starting Installed |
|---|---|---|
| LGB-4R | 350,000 BTUH | $36,500 |
| LGB-4 | 400,000 BTUH | $39,500 |
| LGB-5 | 520,000 BTUH | $46,000 |
| LGB-6 | 650,000 BTUH | $52,500 |
| LGB-7 | 780,000 BTUH | $59,000 |
| LGB-8 | 910,000 BTUH | $65,500 |
| LGB-9 | 1,040,000 BTUH | $71,500 |
| LGB-10 | 1,170,000 BTUH | $78,000 |
| LGB-11 | 1,300,000 BTUH | $85,000 |
| LGB-12 | 1,430,000 BTUH | $91,000 |
| LGB-14 | 1,690,000 BTUH | $104,000 |
| LGB-16 | 1,950,000 BTUH | $116,500 |
| LGB-18 | 2,210,000 BTUH | $131,500 |
| LGB-20 | 2,470,000 BTUH | $147,000 |
Weil-McLain LGB Series 3
LGB-4R
Input: 350,000 BTUH
Starting Installed
$36,500
Weil-McLain LGB Series 3
LGB-4
Input: 400,000 BTUH
Starting Installed
$39,500
Weil-McLain LGB Series 3
LGB-5
Input: 520,000 BTUH
Starting Installed
$46,000
Weil-McLain LGB Series 3
LGB-6
Input: 650,000 BTUH
Starting Installed
$52,500
Weil-McLain LGB Series 3
LGB-7
Input: 780,000 BTUH
Starting Installed
$59,000
Weil-McLain LGB Series 3
LGB-8
Input: 910,000 BTUH
Starting Installed
$65,500
Weil-McLain LGB Series 3
LGB-9
Input: 1,040,000 BTUH
Starting Installed
$71,500
Weil-McLain LGB Series 3
LGB-10
Input: 1,170,000 BTUH
Starting Installed
$78,000
Weil-McLain LGB Series 3
LGB-11
Input: 1,300,000 BTUH
Starting Installed
$85,000
Weil-McLain LGB Series 3
LGB-12
Input: 1,430,000 BTUH
Starting Installed
$91,000
Weil-McLain LGB Series 3
LGB-14
Input: 1,690,000 BTUH
Starting Installed
$104,000
Weil-McLain LGB Series 3
LGB-16
Input: 1,950,000 BTUH
Starting Installed
$116,500
Weil-McLain LGB Series 3
LGB-18
Input: 2,210,000 BTUH
Starting Installed
$131,500
Weil-McLain LGB Series 3
LGB-20
Input: 2,470,000 BTUH
Starting Installed
$147,000
Standard Installation Package — What's Included
Every LGB Series 3 starting installed price covers the following standard scope.
Standard Scope Included
- Boiler/control package
- Primary controls
- Secondary commercial safety controls
- Standard steam piping/materials
- Standard removal of existing boiler
- Standard handling and assembly
- Standard boiler-side gas connection
- Standard boiler-side vent connection
- Standard electrical/control connections
- D's Air & Heating installation labor
- Startup
- Safety testing
- Commissioning
Secondary Commercial Safety Controls
Every LGB Series 3 installed package includes an allowance for applicable secondary commercial safety controls configured for the selected boiler, factory controls, manufacturer requirements, project requirements, applicable code, and the Authority Having Jurisdiction.
- Primary low-water cutoff
- Secondary probe-type low-water cutoff
- Manual-reset/test low-water protection where required
- Operating pressure control
- Independent manual-reset high-limit pressure control where required
- Automatic water feeder where applicable
- Gauge glass and fittings
- Pressure/steam instrumentation
- ASME relief protection
- Ignition/flame safeguard controls
- Required transformers and relays
- Safety interlocks
- Applicable gas safety controls
- Applicable CSD-1 controls
- Associated control wiring
Standard Exclusions
Starting installed prices do not automatically include asbestos testing or abatement, major chimney reconstruction, new chimney liner, major steam-main or condensate-return replacement, new boiler feed system, gas meter or utility upgrades, electrical service or panel upgrades, structural modifications, cranes, extraordinary rigging, or work not specifically identified in the Scope of Work. Final price is subject to field verification and final Scope of Work.
Request a Commercial Boiler Quote
Fill out the form below and D's Air & Heating will contact you to discuss your LGB Series 3 project.
Service Call Policy — D's Air & Heating, Inc.
A $95.35 Service Call Fee is Required for All Service Appointments, Including Warranty Claims.
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 equipment, including high-efficiency condensing boilers, cast iron hot water boilers, commercial heating systems, and steam boiler applications. Whether you need a new Weil-McLain boiler installation Chicago homeowners and businesses rely on, complete boiler replacement, annual maintenance, or emergency repair service, D's Air & Heating has the expertise to keep your heating system operating safely and efficiently.
From residential heating systems to large commercial boiler 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 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 Steam Boiler?
Call D's Air & Heating for a commercial boiler consultation, steam sizing, or installation quote. We serve Chicago and the surrounding area — licensed, insured, and experienced with large commercial cast-iron steam systems.
Why Chicago Homeowners Trust D's Air & Heating
Licensed & Insured
IL License #2183457
Serving Chicago
Since 2009
Authorized Dealer
Multiple Brands
No Contracts
Ever — Guaranteed
Permit Pulled
Every Installation
Professional Standards
Code-Compliant Work
EPA Certified
Mainstream Engineering
R-410A Certified
Mainstream Engineering
Why Choose D's Air & Heating, Inc.?
Chicago's trusted HVAC company since 2009 — licensed, insured, and committed to honest workmanship on every job.
Experience Since 2009
D's Air & Heating has served Chicago homeowners and businesses since 2009. Over 15 years of local HVAC experience means we've seen every type of system, every Chicago building configuration, and every challenge the city's climate presents.
Manufacturer-Trained Technicians
Our technicians receive ongoing manufacturer training and certification. We install Lennox, Goodman, Amana, Daikin, Sinclair, Weil-McLain, Peerless, and other leading brands — and we know each system inside and out.
Licensed, Insured & Permitted
D's Air & Heating holds Illinois HVAC License #2183457 and carries full liability insurance. We pull City of Chicago permits on every installation — protecting you legally and ensuring the work meets code.
Honest Recommendations
We tell you what you need — not what generates the highest invoice. If your system can be repaired cost-effectively, we'll say so. If replacement makes more sense, we'll explain exactly why. No pressure, no upselling.
Local Chicago Expertise
We know Chicago's housing stock — two-flats, greystones, bungalows, vintage buildings with steam heat, modern construction with forced air. We size and install equipment for the specific demands of Chicago homes and Chicago winters.
Long-Term Customer Support
Our relationship doesn't end at installation. We register your equipment for warranty, remain available for follow-up questions, and provide ongoing maintenance to keep your system running at peak efficiency for years.
What Chicago Homeowners Should Know About Boiler Installation
How a Hot Water Boiler Works
A hot water (hydronic) boiler heats water and circulates it through pipes to radiators, baseboard convectors, or radiant floor tubing. The water returns to the boiler, is reheated, and recirculates. Modern condensing boilers achieve 90%+ efficiency by recovering heat from exhaust gases that older boilers waste.
Steam vs. Hot Water Boilers
Steam boilers — common in Chicago's older two-flats and greystones — heat water until it becomes steam, which rises naturally through pipes to cast-iron radiators. They require no circulator pump but need precise water level control. Hot water systems are quieter, more efficient, and easier to zone. D's Air installs and services both.
Boiler Sizing and Near-Boiler Piping
Correct boiler sizing requires calculating the heat loss of every room in the building. Oversized boilers short-cycle and cause water hammer in steam systems. Proper near-boiler piping — header design, equalizer pipe, Hartford Loop for steam — is as important as the boiler itself. D's Air follows manufacturer piping diagrams and ASHRAE guidelines on every installation.
Combustion Safety and Venting
Every boiler installation requires proper combustion air supply and flue venting. Inadequate combustion air causes incomplete combustion and carbon monoxide production. Improper venting allows flue gases to back-draft into the living space. D's Air verifies combustion air, draft, and CO levels on every installation.
What to Expect From Your D's Air Boiler Installation
Free Estimate
We inspect your existing system, measure your building, and provide a written quote covering equipment, labor, and permits.
Equipment Selection
We recommend the right boiler type (steam, hot water, condensing, combi) and brand for your building and budget.
Installation Day
Our crew protects your space, removes the old boiler, installs the new system with proper piping, and cleans up completely.
Startup & Testing
We fill the system, purge air, test all safety controls, verify gas pressure, and confirm proper heat distribution.
Customer Training
We explain your new boiler's controls, how to check the water level (steam systems), and what maintenance is needed.
Warranty Support
We register your equipment and remain available for follow-up service and annual maintenance.
D's Air Installation Standards — Every Boiler Job
- Heat loss calculation and proper boiler sizing
- Near-boiler piping per manufacturer specifications
- Hartford Loop installation on all steam systems
- Backflow preventer and expansion tank on all hot water systems
- Gas line pressure test and leak check at all connections
- Flue venting verification — draft, clearances, and termination
- Low-water cutoff test and safety control verification
- Combustion analysis and CO test after startup
- City of Chicago permit pulled on every installation
- Equipment registered for full manufacturer warranty
What Our Customers Say
Based on Google Reviews — D's Air & Heating, Inc.
Marcus T.
Furnace Replacement
"D's Air & Heating did an outstanding job replacing my furnace. Darryl was professional, on time, and explained everything clearly. The installation was clean and the system works perfectly. Highly recommend."
Latoya W.
Boiler Repair
"Called D's Air when my boiler stopped working in January. They came out the same day, diagnosed the problem quickly, and had it running again within hours. Fair pricing and excellent service."
James R.
AC Installation
"Installed a new central AC system for us this summer. The crew was respectful of our home, cleaned up after themselves, and the system runs quietly and efficiently. Very satisfied."
Ready to Work With Chicago's Trusted HVAC Company?
D's Air & Heating, Inc. — Serving Chicago Since 2009. Licensed, Insured, No Contracts.