Boiler Repair in St. Louis

Steam & Hot Water Boiler Repair From a Team St. Louis Has Trusted Since 1964

Family-owned and still operating that way, we service both steam boilers and hot water boilers with licensed, NATE-certified technicians who diagnose honestly and recommend only what the system actually needs. Martin-Jetco Heating and Air Conditioning has been repairing boilers throughout the St. Louis area since 1964. No unnecessary upsells. No unnecessary work.

Boilers heat your home differently than a furnace does. Instead of forcing heated air through ducts, they circulate hot water or steam through radiators or radiant floor systems. When something goes wrong, the repair requires a technician who knows what to look for, and that’s exactly what we bring.

Signs Your Boiler Needs Professional Attention

Some boiler problems announce themselves loudly. Others show up quietly in your energy bill or in one cold room at the end of the house. Knowing what to look for can help you catch a small issue before it becomes a costly one.

Watch for these warning signs:

• Banging, kettling, or clanking sounds: Persistent noises often point to mineral buildup on the heat exchanger, a worn circulator pump, or a loose internal component.
• Unusual odors: Any smell you don’t recognize warrants immediate attention. A sulfur or rotten-egg odor typically signals a natural gas leak. Leave immediately and call for help before re-entering. Carbon monoxide is odorless, which is why a working CO detector is essential in any home with a boiler.
• Water pooling around the unit: Visible leaks typically trace to a failing pressure relief valve, a degraded seal, or a cracked heat exchanger.
• Uneven heat or pressure loss: Cold zones or a dropping pressure gauge often signal an airlock, a slow system leak, or a circulation problem.
• Pilot light that won’t stay lit: Frequent outages usually point to a faulty thermocouple or a gas supply issue.
• Rising energy bills: When usage hasn’t changed but costs have, the boiler may be working harder than it should to compensate for an underlying problem.

Why St. Louis Homeowners Call Martin-Jetco Heating and Air Conditioning for Boiler Repair

Over 60 years of local boiler service means we’ve worked on virtually every system configuration in the St. Louis market. Our NATE-certified technicians arrive in fully stocked trucks, so most repairs can wrap up in a single visit rather than waiting on a parts order.

What sets us apart:

• Same-day & emergency service available for St. Louis boiler repair
• Honest diagnostics: we tell you what the system needs and nothing more
• A+ rating from the Better Business Bureau
• 0% financing for 18 months on service work
• Coupons and promotions available for boiler service

What to Expect During a Boiler Repair Visit

When a Martin-Jetco Heating and Air Conditioning technician arrives, the first step is a thorough diagnosis: a pressure check, a visual inspection for leaks, and a component-by-component assessment covering the circulator pump, thermocouple, pressure relief valve, and heat exchanger. We identify whether the problem is an isolated component failure or something more systemic before any work begins.

Once we know what’s causing the issue, we walk you through our findings: what we found, what it takes to fix it, and what it will cost before we touch anything. Because our trucks carry the parts most commonly needed for both steam and hot water boiler repair, most jobs can wrap up in one trip.

Common Boiler Problems We Repair

Most boiler failures trace back to a handful of component issues that show up repeatedly across system types and ages. Our technicians know them well.

• No heat or hot water: Often caused by a failed thermostat, broken diaphragm, faulty motorized valve, or pilot light failure.
• Water leaks or drips: Typically trace to a faulty pressure relief valve, a degraded seal, or a cracked heat exchanger.
• Kettling or banging noises: Commonly caused by limescale or mineral buildup on the heat exchanger, a condition that develops gradually with regular use.
• Circulator pump failure: Results in uneven heat distribution or cold zones throughout the home.
• Pressure loss: May indicate a slow leak elsewhere in the system or a failing expansion vessel.
• Pilot light problems: A thermocouple that no longer holds the pilot flame is one of the most frequent repairs we handle.

Boiler Repair vs. Replacement: How We Help You Decide

Not every boiler problem is worth repairing. A useful guideline: if a system is more than 15 years old and the repair cost approaches half the price of a new unit, replacement often makes more financial sense. Older boilers also tend to run at significantly lower efficiency than modern systems, so ongoing repair costs can quietly add up to more than a new installation would require.

That said, many boilers in good structural condition are worth repairing, and that’s where honest assessment matters. We lay out both options clearly so you can make the call that fits your situation and your budget. If replacement turns out to be the right move, our boiler replacement and installation page covers the details, including 0% financing for 48 months on new installations. But we don’t lead with replacement. Repair is the goal whenever it’s the right answer.