Boiler Services
Boiler Repair & Service in Chicago
Gas, oil, and steam boilers — any brand, any age. Darryl diagnoses it right the first time. No contracts, no pressure.
Chicago's Boiler Specialist
Boilers are different from forced-air systems — and not every HVAC tech knows them well. D's Air & Heating specializes in boiler diagnostics, repair, and maintenance for Chicago homeowners. Whether you have a Lennox, Weil-McLain, Burnham, Peerless, or any other brand, we'll get your heat back on fast.
Equipment We Service
Weil-McLain, Navien, Rinnai & More — Any Brand Welcome
Weil-McLain
Evergreen 299–399
High-efficiency condensing gas boiler
Weil-McLain
Evergreen Boiler
Wall-hung condensing boiler system
Weil-McLain
Simplicity Boiler
Residential gas boiler system
Weil-McLain
Residential Boiler
Reliable hot water heating system
Navien
Condensing Combi Boiler
NHB / NFC / NAC / NCB-H series
Noritz
Condensing Combi Boiler
NRCB / NHB series boilers
Lennox
S40 Smart Thermostat
Wi-Fi smart home thermostat
Lennox
Elite Series
High-efficiency heating & cooling
Lennox
Dave Lennox Signature®
Premium top-of-line performance
Lennox
Water Heaters
Tank & tankless water heater service
Lennox
EL18KSLV
18 SEER cooling efficiency unit
Lennox
ML13KC1
Value-tier central air conditioner
Lennox
Merit Series
Reliable everyday HVAC performance
Lennox
Elite Furnace
High-efficiency gas furnace
Lennox
AC Service
Expert Lennox AC repair & service
Lennox
Dave Lennox 80 Furnace
High-efficiency 80% AFUE gas furnace
Lennox
Merit Furnace ML296V
Dependable two-stage gas furnace
Lennox
Rooftop Units
Commercial rooftop HVAC systems
Lennox
Commercial Systems
Full commercial HVAC solutions
Lennox
PureAir™ System
Whole-home air purification
Lennox
Indoor Air Quality
Filtration, humidity & ventilation
Rheem
Rheem HVAC
Rheem heating & cooling systems
Service
Efficient Maintenance
Preventive HVAC maintenance plans
Boiler
Evergreen Boiler
High-efficiency gas boiler system
HVAC
Floor Console Unit
Performance floor console system
HVAC
Endeavor System
Advanced HVAC product system
Peerless
Peerless 211A Boiler
Cast iron gas boiler — residential & light commercial
Weil-McLain
LGB Commercial Gas Boiler
Weil-McLain LGB Series 2 — commercial cast iron boiler
Dunkirk
Dunkirk Gas Boilers
Dunkirk cast iron & steel gas boiler lineup
Thermoflo
Thermoflo Water Boiler
Thermoflo residential hydronic water boiler
GWA
GWA Series 3 Atmospheric Boiler
GWA Series 3 gas water atmospheric boiler
Commercial
DXL-K Commercial Unit
DXL-K commercial HVAC product
What We Offer
Complete Boiler Services
Boiler Diagnostics
Not sure why your boiler isn't heating properly? We run a full diagnostic — pressure, aquastat, zone valves, circulator pump, and more — and give you a straight answer.
- Pressure & temperature testing
- Zone valve & thermostat check
- Circulator pump inspection
- Flue & combustion analysis
- Written estimate before any work begins
Boiler Repair
From a failed circulator pump to a cracked heat exchanger, we repair all boiler components. We fix what others won't touch — any brand, any age.
- Circulator pump replacement
- Aquastat & control board repair
- Zone valve replacement
- Expansion tank service
- Pressure relief valve replacement
Boiler Tune-Up & Maintenance
A properly maintained boiler runs more efficiently and lasts longer. Our tune-up covers everything from combustion efficiency to safety controls. Ask about our maintenance agreement — sign up and get 15% off your next repair.
- Combustion efficiency test
- Burner cleaning & inspection
- Safety control testing
- System pressure check & bleed
- Full written service report
All Brands Serviced
We Work on Every Boiler Brand
Don't see your brand? We likely service it — just call and ask.
Models We Service
Boiler Models by Brand
We diagnose and repair these models and many more. Don't see yours? Call — we likely service it.
Viessmann
| Model | Type | BTU |
|---|---|---|
| Vitodens 200-W | Wall-hung condensing | 199k BTU |
| Vitodens 200-W | Wall-hung condensing | 285k BTU |
| Vitodens 100-W B1KE-199 | Wall-hung condensing combi | 199k BTU |
| Vitodens 100-W B1HE-199 | Wall-hung condensing | 199k BTU |
| Vitocrossal 300 CU3A-199 | Floor-standing condensing | 199k BTU |
Bosch
| Model | Type | BTU |
|---|---|---|
| Greenstar — Residential Condensing Boilers | ||
| Greenstar 57 | Condensing boiler heat-only | Varies |
| Greenstar 100 | Condensing boiler combi / heat | Varies |
| Greenstar 151 Combi | Condensing boiler combi | 151k BTU |
| Greenstar FS | Floor-standing condensing boiler | Varies |
| Buderus — High-Efficiency European Boilers | ||
| Buderus GB142 | Wall-hung condensing boiler | Varies |
| Buderus GB162 | Commercial condensing boiler | Varies |
| Buderus G115WS | Oil cast-iron boiler | Varies |
| Buderus G215 | Oil cast-iron boiler | Varies |
| Buderus SSB Series | Stainless condensing boiler | Varies |
| Greentherm — Condensing Tankless | ||
| Greentherm C 800 | Condensing tankless | Varies |
| Greentherm C 950 | Condensing tankless | Varies |
| Greentherm C 1050 | Condensing tankless | Varies |
| Greentherm 9900i | Premium condensing tankless | Varies |
| Therm — Non-Condensing Tankless | ||
| Therm 520 | Non-condensing tankless | Varies |
| Therm 830 | Non-condensing tankless | Varies |
| ProTankless Series | ||
| ProTankless 1600 | Tankless | Varies |
| ProTankless 2400 | Tankless | Varies |
| IDS — Inverter Ducted Heat Pumps | ||
| IDS Light | Inverter ducted heat pump | Varies |
| IDS Plus | Inverter ducted heat pump | Varies |
| IDS Premium | Inverter ducted heat pump | Varies |
| Greensource — Geothermal Heat Pumps | ||
| Greensource CDi | Geothermal water-to-air | Varies |
| Greensource TW | Geothermal water-to-water | Varies |
| Greensource SM | Geothermal multi-position | Varies |
| Climate Series — Mini-Splits | ||
| Climate 5000 | Single-zone mini-split | Varies |
| Climate 6000 | Multi-zone mini-split | Varies |
| Climate 8000 | Hyper-heat cold-climate mini-split | Varies |
| Air Handlers | ||
| BVA Series | Air handler (IDS matched) | Varies |
| BMA Series | Air handler multi-position | Varies |
| Controls & Thermostats | ||
| BCC100 Thermostat | Wi-Fi thermostat | — |
| BCC50 Thermostat | Basic Wi-Fi thermostat | — |
Rinnai
| Model | Type | BTU |
|---|---|---|
| I-Series Plus IP060160C | Combi | 60k BTU |
| I-Series Plus IP090199C | Combi | 90k / 199k BTU |
| I-Series i150SN | Heat-only | 150k BTU |
| I-Series Plus IP150199C | Combi | 150k / 199k BTU |
Noritz
| Model | Type | BTU |
|---|---|---|
| NRCB Series — Combi (Heat + DHW) | ||
| NRCB180DV | Condensing combi | 180k BTU |
| NRCB199DV | Condensing combi | 199k BTU |
| NRCB199DV-NG | Condensing combi (nat gas) | 199k BTU |
| NHB Series — Heat-Only | ||
| NHB-110 | Condensing heat-only | 110k BTU |
| NHB-150 | Condensing heat-only | 150k BTU |
| NHB-199 | Condensing heat-only | 199k BTU |
| NRC / NRCP Series — Tankless (Hydronic-Compatible) | ||
| NRC98 | Condensing tankless | 98k BTU |
| NRC111 | Condensing tankless | 111k BTU |
| NRC / NRCP Series — Tankless (Hydronic-Compatible) | ||
| NRCP111 | Tankless + buffer tank | 111k BTU |
Navien
| Model | Type | BTU |
|---|---|---|
| NHB Series — Heat-Only | ||
| NHB-55 | Condensing heat-only | 55k BTU |
| NHB-80 | Condensing heat-only | 80k BTU |
| NHB-110 | Condensing heat-only | 110k BTU |
| NHB-150 | Condensing heat-only | 150k BTU |
| NHB-200 | Condensing heat-only | 200k BTU |
| NFC Series — Combi Fire-Tube | ||
| NFC-175 | Condensing combi fire-tube | 175k BTU |
| NFC-200 | Condensing combi fire-tube | 200k BTU |
| NFC-250 | Condensing combi fire-tube | 250k BTU |
| NAC Series — Combi | ||
| NAC-180 | Condensing combi | 180k BTU |
| NAC-240 | Condensing combi | 240k BTU |
| NCB-H Series — Combi Legacy | ||
| NCB-H 120 | Condensing combi legacy | 120k BTU |
| NCB-H 150 | Condensing combi legacy | 150k BTU |
| NCB-H 180 | Condensing combi legacy | 180k BTU |
| NCB-H 210 | Condensing combi legacy | 210k BTU |
| NCB-H 240 | Condensing combi legacy | 240k BTU |
| NFB-C Series — Commercial | ||
| NFB-C 199 | Commercial condensing | 199k BTU |
| NFB-C 301 | Commercial condensing | 301k BTU |
| NFB-C 399 | Commercial condensing | 399k BTU |
Weil-McLain
| Model | Type | BTU |
|---|---|---|
| CGa Series | Cast-iron atmospheric | Varies |
| CGi Series | Cast-iron induced-draft | Varies |
| CGt Series | Cast-iron / tankless coil | Varies |
| GV90+ | Cast-iron high-efficiency | Varies |
| AquaBalance Series | Wall-hung condensing combi | Varies |
| ECO Tec Series | Condensing fire-tube | Varies |
| Ultra Series | Modulating condensing | Varies |
| EG Series | Atmospheric steam | Varies |
| PEG Series | Gas steam | Varies |
| SGO Series | Oil steam | Varies |
Lochinvar
| Model | Type | BTU |
|---|---|---|
| Noble NKC199L | Combi | 199k BTU |
Crown Boiler
| Model | Type | BTU |
|---|---|---|
| Aruba AWR Series | Cast-iron atmospheric | Varies |
| Aruba 4 Series | Cast-iron hot water | Varies |
| Crown AW Series | Cast-iron atmospheric | Varies |
| Crown AWH Series | Cast-iron induced-draft | Varies |
| Phantom Series | Condensing fire-tube | Varies |
| Phantom Combi Series | Condensing combi | Varies |
| Bermuda BSI Series | Gas steam | Varies |
| Bermuda BS Series | Atmospheric steam | Varies |
| Kingston KSZ Series | Oil steam | Varies |
| Freeport 2 FSZ Series | Oil steam high-efficiency | Varies |
Flat-Rate Pricing
Boiler Service Pricing
Transparent flat-rate pricing on installs, maintenance, diagnostics, and repairs — no contracts, no surprises.
All Brands — Diagnostics, Repairs & Installs
| Service | Price |
|---|
Flat-rate pricing. Final cost may vary based on brand, site conditions, permits, and materials. Call for a free on-site quote.
(773) 940-0965Weil-McLain
| Service | Price |
|---|
Prices are flat-rate estimates. Final cost may vary based on site conditions, permits, and materials.
(773) 940-0965Bosch / Buderus
| Service | Price |
|---|
Prices are flat-rate estimates. Final cost may vary based on site conditions, permits, and materials.
(773) 940-0965Boiler Not Working? Call Now.
Free estimates. Ask about our maintenance agreements and save 15% on your next repair.