Hot-Water Boilers for Chicago-Area Homes
Pure Comfort installs hot-water boilers from Lennox, Weil-McLain and other brands, matched to your heating load, piping, radiators and venting rather than the size of the old boiler. See our boiler installation page for pricing and how the install works.
Pure Comfort Heating and Cooling is a Lennox Premier Dealer serving Streamwood and the Northwest Suburbs.
456 Google Reviews
Your Peace of Mind
Flexible Options
We're Here Anytime
Guaranteed
Time for a New Boiler?
Free in-home replacement estimates from a Lennox Premier Dealer.
- Good, Better and Best options with upfront pricing
- Nicor Gas rebates applied where you qualify
- Financing available, including 0% APR on select Lennox systems during Lennox promotions
- Sized with a load calculation, installed and permitted
Boiler Not Heating?
Fast, honest boiler repair from a family-owned Streamwood team.
- $75 diagnostic ($99 evenings, weekends & holidays)
- 24/7 emergency service, with same-day appointments available
- Trucks stocked with common boiler parts, so most repairs are done in one visit
- Upfront, flat-rate pricing before any work starts
Quick Summary
Pure Comfort installs hot-water boilers from Lennox, Weil-McLain and other brands, sized to the home's heating load, piping, radiators and venting rather than the size of the old boiler. We service hot-water systems only, not steam, across Streamwood and the Northwest Suburbs, and replacement estimates are free.
Reviewed by Gene Baldassano, owner and NATE- and EPA 608-certified HVAC technician since 2008 · Updated
How Residential Boiler Heating Works
A boiler heats water or creates steam and sends it through piping to radiators, baseboards or radiant-floor components. Instead of using ductwork and a blower, the distribution system transfers heat through water or steam.
Comfort depends on the complete hydronic or steam system. Boiler capacity, piping, pumps, controls, venting and the condition of the radiation all influence how evenly and efficiently the home heats.
Common Residential Boiler Types
- Hot-Water BoilersHot-water systems circulate heated water through baseboards, radiators or radiant-floor loops. Pumps and zone controls move heat where it is needed.
- Steam BoilersSteam systems send steam through piping to compatible radiators and return condensate to the boiler. They require equipment and controls designed specifically for steam operation.
- Conventional and Condensing BoilersBoilers may use different heat-exchanger and venting designs. High-efficiency condensing equipment requires suitable return-water temperatures, drainage and venting to operate as intended.
The existing distribution system determines which options deserve consideration.
Hot-Water Boilers We Install
We install hot-water boilers from Lennox, Weil-McLain, Peerless and Crown, and service most other brands. We do not install steam systems. Here is how the main options compare.
Cast-Iron Boilers
The proven, long-lasting standard. Vents into a chimney or side wall and is a straight swap for most older boilers.
- About 84% AFUE
- Very durable cast-iron sections
- Simplest replacement for older systems
Condensing Boilers
High-efficiency boilers that capture extra heat from the exhaust and vent through PVC pipe.
- 90%+ AFUE
- Modulates to match the weather
- Compact, wall-hung designs
Condensing Combi Boiler
One wall-hung unit for both home heating and on-demand hot water, so it can replace your boiler and water heater.
- Up to 95% AFUE
- Heat and hot water in one unit
- Frees up floor space
Compare boiler options
| Boiler | Type | Efficiency | Good for | Details |
|---|---|---|---|---|
| Good · Cast-iron boilers | ||||
| Lennox GWB84-E | Gas, cast iron, chimney vent | 84% AFUE | Straight replacement | Manufacturer ↗ |
| Lennox GWB84-IE | Gas, cast iron, chimney or side wall vent | 84.4% AFUE | No usable chimney | Manufacturer ↗ |
| Weil-McLain | Gas, cast iron | Standard efficiency | Proven, long-lasting | Manufacturer ↗ |
| Peerless | Gas, cast iron | Standard efficiency | Proven, long-lasting | Manufacturer ↗ |
| Crown | Gas, cast iron | Standard efficiency | Value replacement | Manufacturer ↗ |
| Better · Condensing boilers | ||||
| Lennox GWB9-IH | Gas, condensing | 90%+ AFUE | Lower gas bills | Manufacturer ↗ |
| Best · Condensing combi boiler | ||||
| Lennox GCWB95 | Gas, modulating condensing combi | 95% AFUE | Heat plus on-demand hot water | Manufacturer ↗ |
Lennox AFUE ratings from lennox.com as of October 2026. We recommend a boiler after checking your piping, radiation and venting on a free in-home visit.
When Boiler Replacement Options Should Be Evaluated
A new boiler may be considered when the existing unit is aging, unreliable, inefficient, leaking or difficult to repair. It may also be part of a broader project to improve zoning, controls or comfort across the home.
Homeowners with radiator, baseboard or radiant-floor heat generally benefit from preserving the strengths of the existing distribution system while correcting any sizing, piping or control issues discovered during evaluation.
Features to Compare
The Distribution System Decides the Boiler
Choosing a Boiler for the Existing System
Boiler sizing should be based on the home’s heating needs and the type of distribution system. Oversizing can create short cycling and reduce comfort, while undersizing can leave the system unable to meet the load during colder conditions.
Pure Comfort reviews the boiler, piping, radiation, controls, venting and problem areas before presenting replacement options. For steam systems, the connected radiation and piping configuration require specific attention.
Installation and System Compatibility
Boiler installation may involve gas piping, venting, combustion air, pumps, expansion components, controls, drainage and connections to the existing distribution system. Old piping conditions and accumulated air or debris can also affect startup and circulation.
Pure Comfort tests heating operation, safeties, circulation and zone controls, then checks the system for leaks, abnormal noise and uneven performance. The homeowner receives guidance on controls and routine maintenance.
Why Choose Pure Comfort for Boiler Work
Boiler and water-heating experience is part of the company’s history
Evaluates the complete piping and distribution system
Explains repair and replacement options without pressure
In-house crews who test controls, circulation and safeties before closeout
Related Boiler Services
Frequently Asked Questions
What is the difference between a hot-water boiler and a steam boiler?
A hot-water boiler circulates heated water through the distribution system. A steam boiler creates steam and must be matched to steam piping, radiators and controls.
Can a high-efficiency boiler connect to existing radiators or baseboards?
Sometimes, but the radiation output, water temperatures, piping, venting and drainage requirements must be evaluated. Compatibility should be confirmed before equipment is selected.
Should a replacement boiler match the size of the old one?
Not automatically. The old boiler may be oversized, and changes to the house may have altered the heating load. Steam systems also require consideration of the connected radiation.
Can one boiler heat different areas separately?
Many hot-water systems can use pumps, valves and controls to create zones. The piping design, minimum flow and boiler requirements must support the zoning plan.
Rebates you may qualify for
2026 utility programs for Northern Illinois homes. Amounts checked October 2026.
| Program | Equipment | Rebate |
|---|---|---|
| Nicor Gas | Boiler, 95%+ AFUE | $350 |
| Nicor Gas | Combination boiler (heat + hot water) | $500 |
The federal 25C tax credit ended for systems installed after December 31, 2025. Illinois income-qualified HEAR heat pump rebates (up to $8,000) are not available yet as of October 2026, and projects finished before the program opens will not qualify. We confirm the current status on your written quote. ComEd discounts come off your invoice when a ComEd heat pump-trained contractor installs qualifying equipment. Nicor Gas rebates require qualifying equipment and Nicor’s rebate application. Programs can change, so we confirm what your home qualifies for on your written quote. Programs and amounts can change, so confirm current details on the utility sites before you buy. Official details: Nicor Gas rebates · ComEd heat pump discounts.
Licensed, certified and accredited
- Lennox Premier Dealer
- NATE-certified technicians
- EPA Section 608 certified
- BBB Accredited Business
- Licensed business in the Village of Streamwood
- Registered Illinois LLC
- Fully insured