Common Boiler Issues in Older Denver Homes

Many Denver neighborhoods feature historic homes dating back to the early 1900s, from Tudor-style houses in Congress Park to charming bungalows in West Highland. While these older homes add character and charm to the city, they may also have heating troubles hidden inside.

Denver’s older homes often have aging boilers that are prone to issues such as low pressure, leaks, and faulty starts. Explore the most common boiler problems Denver homeowners run into and the steps to take if your heating system starts showing warning signs.

Why Older Denver Homes Are Especially Prone to Boiler Issues

Over 50% of homes in Denver’s metro area were built before 1980, with many still featuring their original plumbing and heating systems. While some have updated their boiler systems since construction, many still rely on aging systems to keep their homes warm through the chilly Colorado winters.

Boilers built 20 to 40 years ago aren’t designed to meet the needs of modern homeowners. Wear, extended use, and mineral buildup can lead to costly, frequent issues. Over time, corroded pipes, the pressure of hard water, and the demands of Denver’s harsh winters take their toll on boiler systems, drastically increasing the risk of breakdowns and failures.

Top Boiler Problems You’ll See and What They Mean

Wear, age, and constant use can strain your boiler, leading to high energy bills, strange occurrences, and uncomfortable temperatures in your Denver home. Knowing the signs of boiler issues and their potential causes helps you get ahead of the problem early, keeping your home warm and cozy during even the coldest Mile High City winters. 

Boiler won’t turn on

One of the most obvious signs of boiler trouble is your unit refusing to turn on. Gas or water supply problems, thermostat malfunctions, and faulty circuits can all prevent your boiler from starting up.

Boiler pressure is too low

Your boiler has a pressure guard that keeps your system operating safely. If water leaks or radiator bleeds cause the reading to fall below one bar, your unit may stop responding or shut down completely.

Boiler leaking

If you notice water pooling around your boiler, the internal pump seal or pressure relief valve may be broken. Corrosion or high pressure can also cause components to crack, allowing water to slowly leak out.

Rooms aren’t heating even though the boiler is on

Home still feels chilly even though you started your boiler up hours ago? Incorrect thermostat settings, low pressure, a broken diaphragm, or an extinguished pilot light might be the culprit. 

Strange noises

While it’s not uncommon for your boiler to produce a slight hum as it operates, you shouldn’t hear any loud or strange noises. Banging, gurgling, or whistling sounds are often a sign of trapped air, low water pressure, faulty pumps, or limescale buildup on the heat exchanger.

Pilot light problems

The pilot light is the ignition source of your boiler, so when something goes wrong, the entire system can shut down. Faulty thermocouples, dirt and soot buildup, and poor combustion can cause the flame to go out, leaving you without heat or hot water.

Boiler Troubleshooting Checklist

If your boiler’s showing warning signs that something’s not quite right, don’t panic just yet. A few simple troubleshooting steps can help you get it back up and running in no time. If you run into trouble, try the following: 

• Make sure the boiler is switched on.
• Check if the circuit breaker has tripped and reset it if necessary.
• Inspect the pilot light to make sure it’s lit and burning.
• Look for visible leaks or damage.
• Set the thermostat to a higher temperature.
• Confirm there are no outages in your area.

When It’s Time to Call a Pro for Boiler Repair

Have you gone through all of the troubleshooting steps, and your boiler still won’t work properly? It’s time to call in the pros for boiler repair. Experienced boiler technicians have the tools and expertise to perform thorough evaluations and locate the root cause of the problem. They inspect core components, such as the heat exchanger, electrical system, and valves, to identify hidden issues that DIY checks can’t spot.

If you suspect a gas leak or electrical malfunction, skip the at-home troubleshooting and call a reputable pro right away. Strange, gas-like odors, scorch marks, or loud banging noises are clear signs of serious issues within your system and can pose a safety risk to your household.

Preventive Boiler Maintenance Tips for Older Homes

Scheduling annual tune-ups with a licensed pro helps prevent boiler troubles from happening in the first place. Professional maintenance services include a thorough inspection of your system, helping to catch minor issues before they turn into complete system breakdowns that require boiler replacement.

Keep your boiler running in top condition in between services with the following preventative steps:

• Routinely check the pressure gauge to make sure it’s within 1.0 and 1.5 bars, and call a pro if it drops too low.
• Bleed your radiator at least once a year to let trapped air escape and improve your boiler’s efficiency.
• Inspect the flame for warning signs, such as a yellow light or flickering.
• Keep the area around your boiler clean and free of obstructions.

Need a Pro? Call the Boiler Experts at Sanders & Johnson

When your boiler isn’t working on a snowy Denver night, you don’t have to sit around shivering in the cold. At Sanders & Johnson, we’re on-call and ready to help with a team of trusted boiler experts. Our seasoned technicians have over 40 years of experience providing boiler repair, replacement, and maintenance services throughout Colorado. 

Whether you’re hearing strange sounds, see leaks around the base, or your unit simply won’t turn on, we have the expertise to get it back up and running fast. We perform thorough evaluations, offer clear recommendations, and always aim to provide technical repairs, so you don’t have to invest in a brand-new piece of equipment.

To schedule a boiler inspection or repair, call our family-owned business today! We proudly serve homes and businesses throughout Denver and the surrounding areas, including Aurora,

Dillon, Evergreen, and Parker.

Frequently Asked Questions

How often should I service my boiler?

Scheduling boiler maintenance at least once a year helps keep it running smoothly throughout the chilly winter months. With annual tune-ups, you’ll extend your system’s lifespan, boost its efficiency, and prevent unexpected breakdowns.

Can hard water in Denver affect my boiler?

Denver’s naturally hard water contains high levels of calcium and magnesium. Over time, these minerals can build up in your system, leading to deposits that can cause overheating, excess strain, and potential breakdowns.

When should I replace my boiler instead of repairing it?

If your boiler is nearing the end of its lifespan and showing signs of major malfunctions, such as leaks, corrosion, or failing components, replacement may be a better long-term solution. Our pros will carefully analyze your unit and do their best to provide cost-effective repairs before suggesting an HVAC replacement.