How To Fix a Noisy Baseboard Heater

A noisy baseboard heater can be frustrating, especially if it’s disrupting your sleep. Hydronic baseboard heaters, which rely on hot water to warm a room, can make ticking or banging sounds as pipes expand and contract. Fortunately, this common problem typically has a simple solution. In the video above, Ask This Old House plumbing and heating expert Richard Trethewey explains how to figure out what’s causing the noise and what you can do to fix it.

Finding the Source of Baseboard Heater Noise

Before attempting any repairs, pinpoint the exact source of the noise. This involves careful observation, and you might need to remove the baseboard covers to get a closer look.

Listen Carefully

First, turn up the thermostat and listen closely to the heating system as it activates. Pay attention to the type of noise you hear:

• Banging or clanging may suggest loose pipes or more severe issues.
• Gurgling or bubbling could mean air in the system.
• Ticking or tapping often happens when pipes expand against nearby surfaces.

Expert Insight: Richard Trethewey, This Old House plumbing and heating expert, notes: “It may seem as though hot-water baseboard heating systems can’t help but make clicks, squeaks, and creaks, but in fact those systems should be completely silent. Most times, the noises can be traced to installation shortcuts that didn’t account for the way copper tubing gets longer as it heats up and shorter as it cools down.”

How to Inspect: Before turning up the thermostat, pop off the baseboard covers so that you can see the system’s innards—its fins and tubing. This way, as the system heats up, you can watch the copper tubing expand and pinpoint exactly where it’s rubbing, binding, or banging against brackets and surrounding surfaces.

Inspect the Baseboard Unit

Remove the baseboard covers to examine the piping. Look for:

• Areas where pipes are in close contact with walls, floors, or other surfaces
• Signs of rubbing or wear on pipes or surrounding materials
• How the pipes are routed and supported in the unit

Check for Proper Expansion of Space

Pipes need enough room to expand and contract without hitting anything. Look for tight spots, especially around corners. Check where your pipes pass through the walls and see if there’s enough space. Also, check if the pipes are pressing against drywall or other materials.

How Much Do Pipes Expand? As demonstrated on a This Old House project, 50 feet of copper pipe heated by 100 degrees will expand between a half an inch and an inch. That may not sound like much, but if the pipe has no room to grow — fixed tightly in corners or pressed against walls — it can actually crack the drywall. On one project, a supply line that was too long had pushed against an outside wall with enough force to crack it.

How To Fix Noisy Baseboard Heaters

Once you know where the noise is coming from, you can fix the problem. Most solutions involve giving pipes more room to expand.

Tools and Materials Needed

Gather the following tools and materials before beginning repairs:

• Acetylene torch
• Flux and solder
• Close quarters tubing cutter
• Copper pipe and fittings
• Pipe insulation (optional)
• Plumbing sandpaper

Step-by-Step Repair Process

Now, you can follow Trethewey’s steps to quiet your noisy baseboard heater:

1. Turn off the heating system and close the valves for the affected zone.
2. Drain water from the system until the work area is dry.
3. Clean the pipe using plumbing sandpaper.
4. Use a tubing cutter to remove a small section of pipe (typically 1–2 inches).
5. Clean and flux the cut ends of the pipe and a new copper coupling.
6. Solder the coupling to reconnect the pipe.
7. Allow the repair to cool, then refill and test the system.

Extra Tips for Reducing Noise

If cutting and repositioning your pipes doesn’t fully resolve the issue, try these additional steps:

• Bleed air from the system to help eliminate gurgling noises.
• Install pipe insulation to reduce heat loss and minimize expansion.
• Tighten any loose fasteners or brackets within the baseboard unit.
• Use rubber isolation mounts to separate pipes from the baseboard housing.

Isolate Pipes from Wall Framing: If your baseboard heater produces a moaning sound rather than a ticking noise, the pipe is likely rubbing against wood inside the wall. A split spacer—available at plumbing supply stores—can be placed around the pipe and pushed back into the wall opening to isolate the pipe from touching the wood framing, eliminating that friction-based noise entirely.

Preventing Future Baseboard Heater Noise

Once you’ve fixed your noisy heater, take these steps to keep things quiet in the future:

• Address issues promptly: Don’t ignore minor noises. Ignoring them can make things worse over time.
• Check for proper installation: When installing new baseboard heaters, allow adequate space for pipe expansion.
• Consider system upgrades: Modern, high-efficiency boilers and pumps can reduce overall system stress.
• Regular maintenance: Inspect and clean baseboard units annually to prevent debris buildup.

When To Call a Professional To Fix Your Baseboard Heater

While homeowners can resolve many baseboard heater noise issues, some situations may require professional assistance. We recommend a pro in these scenarios:

• Complex piping configurations
• Concerns about proper soldering technique
• Extensive system-wide problems
• Suspected issues with the boiler or circulator pump

If you’re unsure about any aspect of the repair process or encounter unexpected complications, it’s best to consult a licensed plumbing and heating contractor.