How Do You Bleed a furnace? Vital Tips And Guide

Understanding the Furnace Bleeding Process

To properly understand the furnace bleeding process, it’s important to follow certain steps. Here are the essentials you need to know:

  1. Turn off the furnace and let it cool.
  2. Find the bleeder valve and attach a tube to it.
  3. Put the other end of the tube into a container or bucket for the oil to drain.
  4. Unscrew the bleed screw to let air bubbles and excess fuel out of the line until a steady stream of heating oil flows.
How Do You Bleed a furnace

Once done, switch on the furnace with the reset button or switch and check if it’s working correctly. Note that safety precautions are a must when dealing with heat-related equipment. If there are any issues that need professional help, call an accredited technician straight away. Tevis Energy in Bucks County offers expert services for all kinds of heating oil systems, and emergency deliveries too.

Finally, portable camping stoves have similar designs as oil furnaces. Knowing how to bleed them can be useful while camping or doing outdoor activities. Now, you can confidently bleed your furnace.

Steps to Bleeding a Furnace

Maintaining and properly using your heating system is crucial for the comfort of your home and the safety of your family. Therefore, knowing how to bleed your furnace is important. Below are the steps to follow:

  1. Turn off the furnace. Use the reset button or switch it off from the breaker. This ensures safety when working on the furnace.
  2. Locate the bleeder valve or screw on the fuel pump or burner. Place a container or bucket underneath to collect fuel.
  3. Open the bleeder valve or screw using a wrench. This will release the air from the fuel line, and the fuel will start to flow through the tubing.
  4. Wait until a steady stream of fuel without any air bubbles is visible. Once achieved, close the bleeder valve or screw tightly using the wrench.
  5. If your furnace has a nozzle, replace it, as it might be clogged with debris or oil. Make sure to tighten it properly.
  6. Turn the furnace back on and let it run for a few minutes to check the heating system’s proper functioning.

In case of any issues or if you are doing this for the first time, it is always best to seek professional services in your area that offer furnace maintenance. Always keep safety in mind while handling any kind of fuel and heating equipment. If you smell gas or oil, do not attempt anything and call for emergency services immediately.

Find the Bleeder Valve and Turn off the Furnace

Bleeding a furnace requires you to locate and turn off the bleeder valve. It’s usually a small knob or screw near the furnace base. Different furnaces may have different valve locations, so make sure to check your manufacturer’s manual.

Then, switch off the thermostat or shut down the power supply. Close the gas supply valve too, to prevent gas from flowing in.

After locating and turning off the bleeder valve, follow the manufacturer’s instructions. Don’t run the furnace until all air is removed during the bleed. Not doing so can cause more damage and future troubleshooting issues.

To stay safe and prevent accidents, always remember to do this step before bleeding a furnace. Failing to do so could cause health hazards or costly repairs. Make sure your heating equipment is functioning optimally by following these guidelines.

Connect the Tubing to the Bleeder Valve

Bleeding a furnace requires connecting tubing to the bleeder valve. This path allows trapped air or gas to be safely released. Here are four steps to follow:

  1. Turn off the Furnace: For safety, let it cool for at least an hour.
  2. Locate the Bleeder Valve: It’s usually near the fuel pump or gas burners.
  3. Attach Tubing to Bleeder Valve: Use a quarter-inch drain tap that fits the valve nipple. Attach one end to a container to drain oil.
  4. Open Bleeder Valve: Use pliers or wrenches. Loosen the valve until only fuel runs out.

Be cautious when performing these tasks. If unsure, contact a licensed heat service technician. 

Place the Other End of the Tubing in a Bucket or Container

To collect the extra water during the bleeding process, you need to put the other end of the tubing into a bucket or container. This is essential as it prevents water from spilling and ruining your floors or belongings. Follow these 5 steps for placing the other end of the tubing:

  1. Find a strong and clean bucket or container big enough for the water coming out.
  2. Put the container near the furnace, making sure it won’t move and is on a flat surface.
  3. Attach one end of the hose to the bleeder valve on the furnace, leaving the other end open.
  4. Gently open the valve, letting the air and moisture escape through the hose and into the container.
  5. Close the valve when all the water is gone, and carefully disconnect both ends of the tubing.

Be aware that some furnaces might need multiple rounds of bleeding. So make sure the container doesn’t overflow until the process is done. Furnaces can be different, so understanding them correctly first helps guarantee safety and avoid any issues.

ENERGY STAR found that servicing and venting furnaces properly can increase their efficiency by 10%, lowering energy costs per year. So, get ready to bleed your furnace!

Turn on the Furnace and Start Bleeding

Bleeding a furnace is essential for optimal efficiency. It’s the process of removing excess air from the heating system. Let’s look at how to do it:

  1. Turn on the furnace. Set the thermostat and locate the bleed valve near the base.
  2. Bleed it. Use a key or screwdriver to turn the valve counter-clockwise. Keep going until water comes out. Then quickly tighten the valve back up.
  3. Repeat. If heat is inconsistent, then bleed all radiators from bottom floor to top.

It’s best done by someone who knows their heating system. Get help if needed. Remember, regular maintenance and care is key for efficiency. Bleeding the furnace helps heat spread evenly.

Repeat Until No Air Bubbles Come Out

When bleeding a furnace, the goal is to get rid of any air bubbles. Repeating this until no more exists will help the heater work better and avoid damage. Here are 5 steps to follow:

  1. Turn off the furnace.
  2. Find the bleed valve and insert a screwdriver or add tubing.
  3. Gently open the valve.
  4. Let water or fluid flow and look for air bubbles.
  5. Repeat until all air bubbles are gone.

Be careful not to press too hard when shutting off the heater. Don’t risk harming the furnace keep repeating these steps until no bubbles come out.

This will keep your home cozy and your furnace functioning at its best. 

Tips and Precautions for Safe Furnace Bleeding

Bleeding your furnace is a crucial process to keep your heating system functioning optimally. Here is a list of some of the essential safety tips and precautions to keep in mind while bleeding your furnace.

  • Ensure that the furnace has cooled down, and there is no heat source nearby before starting the bleeding process.
  • Wearing eye protection and gloves is essential to ensure safety from the hot fuel oil and any other debris that may come out during the process.
  • Always refer to the manufacturer’s manual to locate the bleeder valve or bleed screw and the reset button.
  • Use a container or a bucket with a lid to collect the fuel oil and dispose of it safely. 
  • Ensure that the container is not filled beyond its capacity and is not placed in a hazardous area.

Apart from these tips, it is also important to know the unique details of the bleeding process to avoid any issues or problems. When starting the bleeding process, use a tubing attached to the bleeder valve to channel fuel oil to the container. Also, make sure to check the fuel pump and fuel lines for any damages.

Lastly, to ensure the effectiveness of bleeding your furnace, here are some suggestions to keep in mind:

  • Turn off the central switch that controls the power supply of the furnace to avoid any unwanted accidents or incidents.
  • Bleeding your furnace regularly, ideally around two to three times every year, can prevent the buildup of air in the fuel lines, which can cause delivery problems.
  • If you encounter any issue that is beyond your understanding or skills, do not hesitate to call a licensed professional to help you out.

By keeping these tips and suggestions in mind, you can ensure the safety of your family and home. Before attempting to bleed your furnace, remember that safety comes first so you don’t end up burning your house down and becoming the newest viral meme.

Safety Precautions to Keep in Mind

Bleeding a furnace is essential, but safety comes first.

  • Wear protective gear such as clothing, footwear, gloves and eye goggles. 
  • Make sure to switch off the power supply, and keep up proper ventilation. 
  • Before beginning, check for gas leaks and the smell of natural gas. If you sense any, evacuate immediately and call for help. 
  • Keep fire extinguishers nearby and always follow manufacturer instructions. 

Be mindful of safety- don’t let your hot head get in the way!

Important Considerations When Bleeding a Furnace

Bleeding a furnace is a crucial job that needs maximum safety and accuracy. Each homeowner should take some major precautions to make sure their safety and the proper operation of the furnace system. Three significant considerations to remember when bleeding a furnace:

  1. Shut down the power supply – Before beginning, shut down the electric power from your furnace system. You can do this by either using the circuit breaker or by turning off the main power switch on your furnace.
  2. Discover bleed valves – Search for all the bleed valves, which are normally small screws or knobs that stick out from the gas line heading to your furnace.
  3. Release gas pressure gradually – Open every valve gradually and carefully until you hear a hissing sound showing that gas is coming out of the line. After that, take out any blocked air or debris before closing them back up.

It is critical to check that your home’s ventilation requirements are up-to-date when doing this task. Carbon monoxide (CO) gas can come out during such service that could lead to deadly consequences for homeowners if not ventilated quickly

Always follow manufacturer instructions and consult a professional HVAC technician when performing complex maintenance procedures like bleeding your furnace lines. 

When to Call a Professional

Heating systems come with a safety priority – don’t attempt to fix or modify any problems yourself, or it could lead to further damage, injury, or system failure.

Call in an expert! They have the know-how to diagnose and repair complex issues with furnace bleeders, reset buttons, and bleeder valves. Plus, they have the right equipment to access tricky areas and handle dangerous fuels and gasses.

Different fuels, like camping stoves, have their own maintenance and repair needs. So if you’re unsure about the process of bleeding a furnace, don’t risk it. Tevis Energy provides inspections for home and commercial furnaces, as well as heating oil delivery services in Bucks County.

Regular maintenance by a professional every year is the best way to prevent future issues and keep your family safe during the cold season. 


Bleeding a furnace can be a tricky job, but it’s important for safe operation. Remember to check for leaks and make sure you have enough heating oil before you start bleeding. Different furnaces and stoves may have different designs and steps. If you don’t feel confident doing it yourself, get help from a professional technician. Safety first! Wear gloves, eye protection, and keep flammable materials away from the area while bleeding your furnace.