How Much Antifreeze To Winterize An Rv

How Much Antifreeze to Winterize an RV

Winter can wreak havoc on your RV if you don’t take the necessary precautions to protect it from the freezing temperatures. One crucial step in winterizing your RV is using antifreeze to prevent the plumbing system from freezing and causing expensive damage.

Why is Antifreeze Important for Winterizing an RV?

Antifreeze plays a vital role in the winterization process of an RV. It lowers the freezing point of the water in the plumbing system, preventing it from solidifying and causing damage to pipes, faucets, and other components.

It’s important to note that regular antifreeze used for cars is toxic and should not be used in an RV’s plumbing system. You should always use RV-specific antifreeze, which is non-toxic and safe for your RV’s plumbing system.

Determining the Amount of Antifreeze Needed

The amount of antifreeze you’ll need to winterize your RV depends on the size and complexity of your rig’s plumbing system. Generally, most RVs have a standard plumbing system that consists of a fresh water tank, water pump, water heater, and various water lines that supply water to faucets, toilets, and showers.

To determine the amount of antifreeze needed, you’ll need to calculate the total holding capacity of your rig’s plumbing system. This can be done by adding up the capacity of the fresh water tank and water heater, along with the lengths of all the water lines. Typically, an RV holds 6 to 10 gallons of water, but it’s always best to consult the owner’s manual for accurate information about your specific RV.

Steps to Winterize an RV with Antifreeze

Here are the steps you can follow to properly winterize your RV using antifreeze:

  1. Start by draining and flushing the freshwater and wastewater tanks.
  2. Turn off the water heater and open the pressure relief valve to release any remaining water.
  3. Locate the water pump, which is usually located near the freshwater tank.
  4. Disconnect the intake hose from the water pump and place it into a container of RV antifreeze.
  5. Turn on the water pump to start pumping antifreeze throughout the plumbing system.
  6. Go inside your RV and open all the faucets, including the shower and toilet to allow the antifreeze to flow through.
  7. Keep the faucets open until you see the antifreeze running through them, ensuring all the lines are fully protected.
  8. Flush the toilet until you see the antifreeze in the bowl and pour some into the toilet tank as well.
  9. If you have an outdoor shower or any other water outlets, make sure to run the antifreeze through those as well.
  10. Once the antifreeze is running smoothly through all the lines, turn off the water pump and close all the faucets.

Additional Tips for Winterizing an RV

Here are a few additional tips to keep in mind when winterizing your RV:

  • Before starting the winterization process, make sure to drain and clean your RV’s fresh water tank.
  • Consider using a blowout plug to remove as much water as possible from the plumbing system before introducing the antifreeze.
  • When pumping antifreeze, start with the faucet furthest from the water pump, then move to the closest one to ensure the antifreeze covers all the lines.
  • Don’t forget to remove any water filters before introducing antifreeze into the system.
  • Label your antifreeze container to avoid any accidental ingestion.
  • After winterizing, make sure to keep your RV’s batteries fully charged and periodically check on your RV throughout the winter to ensure everything remains in good condition.

Frequently Asked Questions Of How Much Antifreeze To Winterize An Rv

How Much Antifreeze Do I Need To Winterize My Rv?

To properly winterize your RV, you’ll need approximately one to three gallons of antifreeze, depending on the size and plumbing system of your RV.

Can I Use Regular Antifreeze To Winterize My Rv?

No, you should not use regular antifreeze to winterize your RV. Make sure to use RV-specific antifreeze, which is non-toxic and safe for your plumbing system.

Should I Dilute The Antifreeze Before Using It In My Rv?

No, you should not dilute the antifreeze before using it in your RV. Using undiluted antifreeze will provide the necessary protection against freezing temperatures.

How Do I Winterize My Rv With Antifreeze?

To winterize your RV with antifreeze, start by draining the water system and bypassing the water heater. Then, use a hand pump to push the antifreeze through the plumbing system until all fixtures run pink.


Knowing how much antifreeze to use when winterizing your RV is essential to protect the plumbing system from freezing temperatures, ensuring your RV remains in good condition when spring arrives. By following the steps outlined above and taking the necessary precautions, you can confidently winterize your RV and be prepared for the colder months ahead.

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