How Burnham Boilers Work and What to Expect From Yours

What Burnham boilers are and where you'll find them

Burnham is a boiler manufacturer owned by U.S. Boiler Company, and their units heat homes across North America by burning oil or gas to warm water that circulates through radiators or baseboards. You'll find Burnham boilers in older homes especially, though they still manufacture new models. The brand is known for durability—many Burnham units installed decades ago still run today—but that age also means you may be dealing with a system that needs specific care to keep working well.

Burnham makes both cast-iron and steel boilers in a range of sizes. Cast-iron models are heavier and last longer but take time to heat up and cool down. Steel models heat faster but are lighter and less durable over decades. If you're looking at your boiler's nameplate and see "Burnham" printed there, you're working with equipment designed to last, but one that also requires regular attention to stay reliable.

Key Takeaways

• Burnham boilers are oil or gas-fired units common in older homes, and many are still in use after 30 or 40 years because of their solid construction.
• Annual maintenance—cleaning the burner, checking the flue, and inspecting the heat exchanger—keeps your Burnham running safely and efficiently.
• Burnham boilers need a clear exhaust path; blocked flues or chimneys are the most common reason they stop heating or produce carbon monoxide.
• Replacement parts are still available through HVAC suppliers, but finding a technician familiar with older Burnham models may take a few calls.
• If your Burnham is over 25 years old and needs major repair, comparing the cost to a new system will help you decide whether to fix or replace.

How to maintain your Burnham boiler safely

Burnham boilers need an annual inspection and cleaning, ideally before the heating season starts. A technician will check the burner flame (it should be bright blue, not yellow or orange), clean the combustion chamber, inspect the heat exchanger for cracks or corrosion, and test the flue to make sure exhaust is leaving the house. If you heat with oil, the nozzle and strainer also need cleaning or replacement each year.

Between professional visits, you can check a few things yourself. Look at the pressure gauge on the front of the boiler—it should read between 12 and 15 pounds per square inch (psi) when the system is cold. If it's lower, you may have a slow leak in the system. Listen for unusual sounds: a kettling noise (like boiling water) means scale is building up inside the heat exchanger, and a rumbling sound often signals incomplete combustion or a dirty burner. Both need professional attention.

Never ignore leaks around the boiler base or connections. Burnham boilers are cast iron or steel, and water sitting on metal will rust through. A small drip today becomes a major leak tomorrow. Wipe up any water you see and call a technician to find the source—it's usually a valve, a connection, or a crack in the heat exchanger.

Checking your Burnham's exhaust and flue system

The flue—the pipe that carries exhaust out of your home—is critical to safe operation. A blocked or damaged flue forces exhaust back into your house, which can release carbon monoxide, a colorless, odorless gas that is dangerous in even small amounts. Check the flue visually where it leaves the boiler: it should be clear of debris, and there should be no gaps or loose connections.

If your Burnham vents into a shared chimney (common in older homes), make sure the chimney is swept annually by a certified chimney sweep. Creosote buildup, bird nests, or fallen bricks can block the flue without you knowing. A blocked chimney will cause the boiler to shut down on its safety switch, leaving you without heat. If you smell exhaust inside the house or see soot around the boiler, stop using it and call a technician immediately.

Condensation around the flue pipe is normal in some cases, but pooling water or rust stains mean the flue is damaged or the boiler is running too cool. Older Burnham models especially can develop cracks in the heat exchanger over time, and water escaping into the flue is a sign of that damage.

Troubleshooting common Burnham boiler problems

If your Burnham won't fire up, check the thermostat first—make sure it's set to heat and the temperature setting is above the current room temperature. Then look at the reset button on the burner (usually a red or black button on the front). If the boiler has shut down on safety, press the reset button once and wait 30 seconds. If it fires, you're back in business. If it shuts down again immediately, stop and call a technician; repeated shutdowns mean the burner is not igniting properly or the flue is blocked.

If the boiler is running but not heating, check the circulator pump—a small motor that pushes water through the pipes. You should feel it vibrating slightly when the boiler is on. If it's silent and still, the pump may have seized or failed. Also check that all radiator valves are open (turn the handle so it lines up with the pipe) and that the system pressure is still in the normal range.

Banging or clanging in the pipes usually means air is trapped in the system or the water is boiling inside the pipes. Bleed air from the radiators one by one using the small valve at the top of each unit, or call a technician if you're not comfortable doing it. Boiling water in the pipes is more serious and suggests the boiler is running too hot or the circulator is not moving water fast enough.

When to repair versus replace your Burnham

Burnham boilers often last 25 to 35 years with proper maintenance, but at some point repair costs climb faster than replacement makes sense. If your boiler is over 25 years old and needs a major repair—a new heat exchanger, a new burner, or a new circulator pump—get a quote for both the repair and a new system. A new boiler will be more efficient, quieter, and come with a warranty; an older Burnham may limp along for a few more years but will eventually need replacing anyway.

Efficiency also matters. Older Burnham boilers typically run at 80 to 85 percent efficiency, meaning 15 to 20 percent of the fuel you pay for goes up the chimney as waste. A new boiler runs at 90 to 98 percent efficiency, which can lower your heating bills noticeably over time. If you're paying for frequent repairs and your heating bills are high, replacement may save money in the long run.

Finding parts for older Burnham models is still possible—the company has been around since 1946 and parts are available through HVAC suppliers—but labor costs can be high if the technician has to special-order components or spend extra time on an unfamiliar model. Get multiple quotes before committing to a major repair on an older unit.

Finding a technician who knows Burnham boilers

Not every HVAC company works on older Burnham models regularly, so call ahead and ask. A technician who specializes in oil or gas heating and has experience with cast-iron boilers will be more efficient and confident than one who mainly installs new systems. Ask how long they've been in business and whether they stock common Burnham parts or have to order them.

If you're in an area where Burnham boilers are common (older neighborhoods in the Northeast and Midwest especially), you'll have more choices. In newer areas or regions where most homes use forced-air furnaces, you may need to call several companies before finding one willing to work on your boiler. Don't settle for a technician who seems reluctant; you want someone who knows the equipment.

Frequently Asked Questions

How often should I have my Burnham boiler serviced?

Once a year, ideally in the fall before heating season starts. If you heat with oil, the nozzle and strainer should be cleaned or replaced annually. If you notice problems during the heating season—unusual sounds, leaks, or loss of heat—call a technician right away rather than waiting for the annual visit.

What does it mean if my Burnham boiler keeps shutting down?

The boiler has a safety switch that shuts it down if the burner won't ignite or if exhaust is backing up into the house. Press the reset button once and wait 30 seconds. If it shuts down again, the flue may be blocked, the burner may be dirty, or the ignition system may be failing. Stop using it and call a technician.

Can I replace just the burner on my Burnham, or do I need a whole new boiler?

You can replace just the burner if the rest of the boiler is sound. A new burner is much cheaper than a new boiler and can extend the life of an older unit by several years. A technician can tell you whether the heat exchanger and other components are still in good condition.

Is it safe to use a Burnham boiler that's 40 years old?

Yes, if it's been maintained well and passes a safety inspection. Have a technician check the heat exchanger for cracks, test the flue for proper draft, and inspect all connections for leaks. If everything checks out, the boiler is safe to use, though you should expect higher repair costs and lower efficiency than a newer unit.

Why is my Burnham boiler making a kettling sound?

Scale and mineral deposits are building up inside the heat exchanger, causing water to boil unevenly. This reduces efficiency and can damage the boiler over time. A technician can flush the system or add a descaling chemical to break down the deposits. In hard-water areas, this may happen every few years.