How to Winterize a Hot Water Pressure Washer

Frozen machine image

It’s winter time again, and it’s time to let those hot water pressure washers inside or winterize! They’re cold! Pressure washer winterizing takes minutes and can save you thousands of dollars in repairs.

If you have a pressure washer, it’s time to winterize. If you can’t complete the winterizing process, keep your machine in a heated space until you can. Water freezing in your pump and coil will cause damage.

Steps To Winterize

There are a few quick steps that are easy to do and prevent the cold from damaging your pressure washer pump and coils.


  • Winterizing will require a 50/50 automotive blend antifreeze. 
  • 5-gallon bucket or container


First, drain the water out of your float tank.

Then fill with antifreeze, turn on your machine, pull the trigger gun, and run the antifreeze through your pressure washer and into the pump and coil until you see green coming out the nozzle.

The antifreeze will protect inside metal wetted surfaces, packings, and plungers in the pump to your coil.

Also, quickly open and shut your trigger several times to get antifreeze into your bypass line.

Lastly, you can blow out the antifreeze into a bucket or container or leave it in the machine until spring.

Bonus Tips:

  • When spring comes, drain the antifreeze from your pressure washer into a bucket or sealable container. Then, you can reuse the antifreeze again next winter.
  • We recommend getting an antifreeze tester to ensure you have enough strength to keep things from freezing. Water will dilute the antifreeze.
  • Store your antifreeze container away from pets and kids.

We hope you find this information helpful when the weather starts to turn. As always, if you have further questions, please consult your local Alkota dealer; we’re happy to help!

Want a Hot Washer Pressure Washer How-To video?

Check out Jeff’s winterizing guide right here:

Download the Winterize Your Pressure Washer Guide PDF Here

the ultimate guide to pressure washers

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