Expert Boiler Installation by Certified Technicians in St. Louis
Boiler heating is quiet, efficient, and delivers some of the most consistent warmth available and for the right St. Louis home, it's hard to beat. Air Comfort Service has installed and serviced boiler systems across the St. Louis metro for over 55 years.
Is a Boiler Right for Your St. Louis Home?
Most St. Louis homes are built around forced-air furnaces. Boilers work differently. They heat water and distribute warmth through radiators, baseboard heaters, or radiant floor panels. Here's when a boiler is the right fit for your St. Louis home, and when it isn't.
A boiler is likely the right fit if…
Your home already has a boiler and needs a replacement. This is the most common scenario.
You own an older St. Louis home (pre-1960s) with existing steam or hot water infrastructure.
You're in Tower Grove, Soulard, Central West End, or similar neighborhoods built with steam heat.
You want radiant floor heating in a new addition or renovation.
When a boiler probably isn't the right call…
Your home currently has ductwork and a furnace. Switching to a boiler system adds significant cost.
If you're looking for the most cost-effective upgrade path a furnace or heat pump replacement typically wins.
We'll be straight with you: If forced-air is a better fit for your home, we'll tell you. An honest recommendation earns more trust than a sale that doesn't make sense, and we've been in St. Louis long enough to care about that.
Types of Boilers We Install
Steam Boilers
Heats water past the boiling point to produce steam, which is then distributed through single or two-pipe systems to radiators. This is more common in older St. Louis homes. We install, replace, and can convert single-pipe to two-pipe for improved zone control.
Hot Water (Hydronic) Boilers
The most common modern boiler type. Heats water to 140–180°F and circulates it through baseboard heaters, radiators, or radiant floor systems via a pump. More efficient than steam and easier to zone. We install both traditional and high-efficiency condensing models.
Combination Boilers
Provides both space heating and domestic hot water from a single unit, eliminating a separate water heater. Ideal for smaller homes or where space is limited. We'll confirm if your home's hot water demand is a good fit before recommending one.
The Boiler Installation Process
Here's exactly what to expect when you book a boiler installation with Air Comfort Service.
1. Free in-home assessment
Your technician evaluates your current system, determines the correct boiler size, and explains your options in plain language.
2. Written quote — no pressure
A detailed estimate before any commitment. Covers what's included, permits required, and the expected timeline.
3. Permits pulled
Boiler installations in St. Louis City and County require permits. Air Comfort Service manages the permit process on your behalf.
4. Installation day
Most residential boiler replacements complete in one day. New installations requiring significant piping may take two.
5. System test and startup
We test the full system, calibrate controls, and walk you through the new unit before we leave.
6. Permit closeout
We coordinate the final inspection and ensure all permits are properly closed, no loose ends.
1. Free in-home assessment
Your technician evaluates your current system, determines the correct boiler size, and explains your options in plain language.
2. Written quote — no pressure
A detailed estimate before any commitment. Covers what's included, permits required, and the expected timeline.
3. Permits pulled
Boiler installations in St. Louis City and County require permits. Air Comfort Service manages the permit process on your behalf.
4. Installation day
Most residential boiler replacements complete in one day. New installations requiring significant piping may take two.
5. System test and startup
We test the full system, calibrate controls, and walk you through the new unit before we leave.
6. Permit closeout
We coordinate the final inspection and ensure all permits are properly closed, no loose ends.
Boiler vs. Forced-Air Heating — An Honest Comparison
This is a fair comparison. If forced-air is a better fit for your home, we'll tell you.
| Boiler (Hydronic) | Forced-Air (Furnace) | |
|---|---|---|
| Heat Quality | Even, radiant warmth, no drafts | Can create hot/cold spots; air movement felt |
| Air Quality | Doesn't circulate air; good for allergies | Circulates dust, pet dander, and allergens |
| Noise | Near-silent operation | Fan and duct noise during operation |
| Zoning | Easy to zone by room or floor | Requires dampers; more complex to add |
| Install Cost | Higher, especially without existing piping | Lower for direct equipment replacement |
| Efficiency | High-efficiency condensing: 90%+ AFUE | Modern furnaces: 80–98% AFUE |
| Ductwork | Not required | Required; expensive to add if absent |
| Maintenance | Annual service recommended | Annual service recommended |
| Boiler (Hydronic) | Forced-Air (Furnace) | |
|---|---|---|
| Heat Quality | Even, radiant warmth, no drafts | Can create hot/cold spots; air movement felt |
| Air Quality | Doesn't circulate air; good for allergies | Circulates dust, pet dander, and allergens |
| Noise | Near-silent operation | Fan and duct noise during operation |
| Zoning | Easy to zone by room or floor | Requires dampers; more complex to add |
| Install Cost | Higher, especially without existing piping | Lower for direct equipment replacement |
| Efficiency | High-efficiency condensing: 90%+ AFUE | Modern furnaces: 80–98% AFUE |
| Ductwork | Not required | Required; expensive to add if absent |
| Maintenance | Annual service recommended | Annual service recommended |
Bottom line: If your home already has a boiler, replacing it with a modern unit is almost always the right call. If your home has ductwork and a working forced-air system, a furnace or heat pump replacement is typically more cost-effective. We'll give you a straight answer based on your home.
What Does Boiler Installation Cost in St. Louis?
Cost depends on boiler type, system size, and the complexity of your existing piping. Typical ranges of boiler installation in the St. Louis area include:
Standard hot water boiler replacement
$4,000–$8,000
High-efficiency condensing boiler replacement
$6,000–$12,000
Steam boiler replacement
$5,000–$10,000
Combi boiler installation
$5,000–$9,000
New installation (no existing system — add for piping)
+$2,000–$5,000
These are ranges. Your actual cost depends on the specific unit and your home's layout. The most accurate number comes from a free in-home assessment.
Financing Options
A new boiler is a significant investment, and Air Comfort Service makes it manageable. We offer 0% APR financing for up to 72 months on new equipment installations through Wells Fargo (with approved credit).
An aging, inefficient boiler costs more every month it runs. Ask your technician to walk you through a cost-over-time comparison at your free estimate. The monthly savings on a high-efficiency system often offset the payment.
Boiler Installation Across the St. Louis Metro
Tower Grove
Soulard
Central West End
Lafayette Square
Chesterfield
Ballwin
Tower Grove
Soulard
Central West End
Lafayette Square
Chesterfield
Ballwin
Kirkwood
Webster Groves
Creve Coeur
Ladue
Florissant
Kirkwood
Webster Groves
Creve Coeur
Ladue
Florissant
Hazelwood
O'Fallon
St. Peters
Wentzville
Mehlville
Oakville
Hazelwood
O'Fallon
St. Peters
Wentzville
Mehlville
Oakville
Not sure if we cover your area? Check out our full service area page.