How to Bleed Baseboard Heaters: A Step-by-Step Guide

Maintaining your baseboard heating system ensures your home stays warm, efficient, and quiet through the colder months. One common maintenance task is bleeding air from baseboard heaters—a simple, DIY-friendly process that can significantly improve heating performance. In this article, we’ll walk you through how to bleed baseboard heaters, how often it should be done, and why it matters for your comfort and energy efficiency. 

Why Bleeding Baseboard Heaters Is Important 

Over time, air can become trapped in your hydronic baseboard heating system. This air prevents hot water from flowing freely, leading to: 

• Cold spots in your home
• Noisy pipes (gurgling or banging sounds)
• Reduced heating efficiency
• Higher energy bills 

Bleeding your baseboard heaters releases this trapped air, allowing hot water to circulate smoothly and your system to operate quietly and efficiently. 

How Do You Bleed Baseboard Heaters? (Step-by-Step) 

Before you begin: This guide applies to hydronic baseboard heaters (those that use hot water). Electric baseboard heaters do not require bleeding. 

What You’ll Need: 

• A radiator key or flathead screwdriver (depending on your valve type)
• A small container or towel
• Gloves (optional but helpful for hot surfaces) 

Step 1: Turn Off the Heat 

Shut off your boiler and allow the system to cool. This prevents hot water from spraying when you open the valve. 

Step 2: Locate the Bleed Valves 

Bleed valves are usually located at one end of each baseboard unit. You may need to remove the baseboard cover to access them—luckily, Baseboarders® DIY-friendly covers are easy to remove and replace. 

Step 3: Open the Valve 

Using your radiator key or screwdriver, slowly turn the valve counterclockwise. You’ll hear a hissing sound as air escapes. Hold your container underneath to catch any water that follows. 

Step 4: Close the Valve 

Once water starts flowing steadily without air sputtering out, close the valve by turning it clockwise. 

Step 5: Repeat as Needed 

Move through each room with a baseboard unit and repeat the process. 

Step 6: Turn the Heat Back On 

Restore power to the boiler and enjoy a warmer, more efficient home. 

How Often Should You Bleed Baseboard Heaters? 

Most homeowners should bleed their heaters once a year, typically at the start of the heating season. However, you might need to do it more often if: 

• You hear unusual noises (gurgling or banging)
• Some rooms stay cooler than others
• You’ve recently refilled or serviced the system 

Bleeding your baseboard heaters regularly helps extend the lifespan of your system and lowers energy consumption. 

FAQs About Bleeding Baseboard Heaters 

Q: How do I know if my baseboard heaters need bleeding? 

If you hear bubbling or banging sounds, or if certain rooms aren't heating evenly, there's likely air trapped in the system. 

Q: Can I bleed baseboard heaters myself, or should I call a pro? 

You can absolutely bleed them yourself! It’s a safe, simple process—as long as you follow the steps carefully and your system is water-based. 

Q: What if I don’t have a bleed valve on my baseboard heater? 

Some systems may not have individual bleed valves. In that case, bleeding is done at the boiler or highest point in the loop. A licensed HVAC professional can help if you're unsure. 

Q: Will bleeding the heater make my system more energy-efficient? 

Yes. Trapped air makes your system work harder. Bleeding improves circulation, which can lower your energy bills and boost comfort. 

Q: Do I need to replace water in the system after bleeding baseboard heaters? 

In most cases, no additional water is needed after bleeding a baseboard heater. The amount of water lost during the bleeding process is typically minimal. However, if you bleed multiple units or notice a significant drop in water pressure, it's a good idea to check the pressure gauge on your boiler. If it's below the recommended range (usually 12–15 psi when cold), you may need to top off the system with water. Always refer to your boiler’s manual or contact a heating professional if you’re unsure. 

Keep It Warm—and Good Looking 

Regular maintenance like bleeding your baseboard heaters keeps your home cozy—but appearance matters too. If your covers are rusted, bent, or outdated, they’re more than just an eyesore. Baseboarders® DIY baseboard heater covers are the quickest and most attractive way to upgrade your home’s look, with no tools or contractor required. 

Ready to Refresh Your Baseboard Heaters? 

Explore our collection of modern, easy-to-install baseboard heater covers and take your space from dated to designer in minutes.