DIY - How to Winterize a Pressure Washer

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Introduction: DIY - How to Winterize a Pressure Washer

About: Just a guy who doesn't know when to quit, and is constantly in search of a solution to a problem that doesn't exist yet.

Winter is here again! Time to pull out the coats, stash the motorcycle 'till next season...and properly store some tools. Certainly not the funnest task in the world, but one worth doing nonetheless.

Winterizing your pressure washer serves one main purpose. To make sure it works the next time you need to use it. And done right, it really is worthwhile. The pump portion of your pressure washer can and will break or deteriorate if neglected. I replaced one not long ago. If you're lucky, you can simply repair it for around 60-100$ bucks, but on most models these days that isn't even possible. Winterizing it is just cheap insurance.

And whereas commercial winterizing products can cost over 400$ per gallon if you buy them at around 12-20$ per 4 Fl Oz (I'm not joking. Calculate it yourself, it really would cost that much per gallon), I'm going to show you something just as good if not better. For as low as around 3$ per gallon. Keep reading to see if the solution convinces you or not. Also, this DIY might be updated over time. To see the latest version, click here.

Let's begin!

Difficulty: Easy
Tool Requirements: Basic
Time: 20 Minutes
Cost: 5$

Step 1: Why Winterize at All?

Depending on where you live, winterizing can serve one or more purposes:

  • To keep frozen water from over-pressurizing and damaging the water pump.
  • To keep pump internals from rusting.
  • To keep mineral deposits from increasing friction and degrading/destroying seals.
  • To keep pump surfaces lubricated for longer life on start up.

A proper winterizing solution has to do all of that. And by the way, it applies regardless of the pressure washer being electric or gasoline powered. Even if you don't live somewhere with freezing temperatures, the rust, deposits and lubrication aspects would still apply to you. Basically, you could substitute "winterize" for "long term storage" just the same.

The easiest way to take care of most things on that list is to empty the water pump before putting it away, however that still leaves the option of rust and mineral deposits which will tear or damage seals in the long run. Nonetheless, for short term protection against freezing it's the easiest option and what I'd do.

However, if you know you won't be using the pressure washer for a while, and you want to take proper care of your pressure washer for the best longevity, you are going to want to use something that tackles all of those issues. But if you're like me, you probably don't really know if you'll be firing up the pressure washer next week or in four months. And if that's the case, you'll never find a moment to waste a 10$ bottle of "Pressure Washer Pump Saver". You'll always save it for next time. Plus, the commercial options are a pain to apply right. In my opinion, for a product like this to be worth it, it has to be cheap enough to apply without concern about it being costly.

And that's where this Instructable comes in.

Step 2: What You'll Need

  • RV Antifreeze - RV Antifreeze is used to winterize RV's water lines (potable water, not in the engine). It's main difference with normal antifreeze is that it is non-toxic and biodegradable, making it perfect for a pressure washer. The components are Ethyl Alcohol (anti-freeze, disinfectant?), Propylene Glycol (anti-freeze), Water, Di Potassium Phosphate (buffer), Colorant and a Fragrance. On it's own, it won't provide much anti-rust properties (though it displaces oxygen) but it's excellent as a non-toxic antifreeze. Finally, it's dirt cheap at around 2-5$ per gallon if you look around for it (online it might cost more due to shipping). Not all brick and mortar stores have it (and if they do, some over charge). To find it the cheapest I'd suggest looking at Walmart. Note - As an alternative you could use regular antifreeze, but it's going to be more expensive and toxic (though not a huge concern for the small quantities used).
  • Water Pump Lube - I used Bar's Leaks Water Pump Lube w/ Anti Rust (the same stuff I use in my car), but just use which ever is cheaper. The key words are "Anti-Rust" and "Lube". Don't simply buy a "Coolant additive", that's not what you're looking for. The purpose of this is to prove extra lubrication and corrosion protection, while being water soluble (which is why we can't use any "normal" oil...pesky molecular polarity). If you search around it should cost you somewhere in the 3-6$ range for a 12oz bottle, which is good for 1-3 gallons of coolant. That way you can use it for the winterizing solution and to put the remainder in your car if you like.
  • A Funnel - A large reservoir-funnel with a hose attached is going to be the easiest way to do this, since you can attach it directly to the pump's inlet.
  • Hose Repair Kit - This is needed in order to connect the funnel's hose to a garden hose thread.
  • Connectors and Shut-Off Valve- You'll need some connectors to connect the funnel to the pressure washer's inlet, as well as a way to stop the flow before removing it to avoid waste.
  • Heat Gun- To heat the hose and make it pliable. I used a flameless lighter, but a hair dryer or lighter is a perfect substitute.

At at low as 3$ for a gallon of RV Antifreeze, and 4$ for a bottle of water pump additive (of which you only need one third or so), you'll have made a gallon of the solution for around 5$, enough to treat multiple pressure washers every time they won't be used for a long period, for years to come. Sure beats the one or two use commercial option at over 10 bucks.

Now let's get on to the practical application.

Step 3: Assemble the Funnel

The first step is to assemble the funnel to make it connect to the pressure washer's inlet.
As you can see from the pictures, I used an automotive funnel which was perfect for this application since it can hold around one liter (a quarter gallon) of solution and has a filter (to avoid debris getting in the pump). Both my pressure washers also have quick connector attachments, so I needed one of those for it. And to keep the liquid inside the funnel's hose from being wasted, I put a shut off at the very end.

Depending on you're application, assemble it however is suitable for your needs.

Step 4: Attach the Funnel and Fill

If the pressure washer is electric, you can get away with holding it in your hand while running the fluid through the pump.

If your pressure washer is gasoline powered, you'll need someone to hold the funnel. Or to attach it somehow to the pressure washer's frame so it doesn't spill.

Then fill it up. You want to fill it with more than you intend to use. You can simply pour the excess back into the bottle later.

Step 5: Circulate the Solution

The purpose is to displace the regular water inside pressure washer's water pump with the solution we prepared.

If your pressure washer is electric, turn it on a few seconds until you've flushed the water inside the pump out, and undiluted solution is coming out of the outlet. It should only take a few seconds, you don't have to waste more than needed.

If your pressure washer is gasoline powered, with the power switch off pull the starter cable until you've flushed the water inside the pump out, and undiluted solution is coming out of the outlet. It should take you somewhere between 3-10 full pulls, but no more.

Once you're satisfied, close the valve on the hose end, remove the funnel, and put the unused solution back in the container.

Should I leave the pump-saver fluid in, or flush it out?

Where opinions may vary is whether to leave the winterizing solutions inside the water pump, or to flush it out once you've displaced the regular water and coated the internal surfaces. It's your choice. The RV antifreeze won't freeze, but at most might turn slushy at the coldest temperatures. You should be covered up to -50F which is good enough for just about anyone.

If you're sole concern is damage from frozen (expanded) water, I'd empty it out.However, if you want the corrosion protection and lubrication just as much as the anti-freeze protection, I'd leave it in.

Step 6: You're Done!

You're done!

Wipe the pressure washer off and put it away in a nice cozy location for hibernation. Once you're ready to use it again no preparation is needed.Just hook it up and releash the power of H2O! Since it's biodegradable and stainless, just water it away on your lawn. And if you end up using it sooner than expected, the pump's internals will appreciate the lubrication, and since the solution is cheap, you won't feel like you've thrown money away.

Anyway, I hope this was helpful. If you found this interesting, click the 'Follow' button up on the right to get notified of similar projects in the future, or check out my profile to see what other projects I've been up to. Here are a few you might like:

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