Pressure water pumps work to pump water and accelerate the water flow with your pressure washer. In order for your pressure washer to shoot water quickly through your hose, it needs to have a high-quality pump.
The high-powered water pump shoots a fast-moving stream of water that removes dirt, grime, dust, chewing gum, mold, loose paint, and sludge from surfaces. Most homeowners purchase pressure washers to help clean large surfaces such as their home’s exterior (great for brick or siding), garage floor, driveway, and vehicles.
Businesses also often purchase pressure washers to help clean their buildings and appliances.
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Pressure Washer Pump Types
Wobble
The wobble pump is driven by the drive shaft. It uses pistons to function. The wobble plate pushes these pistons, which creates a suction force that creates the high-powered water pressure you need. Most wobble pressure washer pumps will last approximately 250-450 hours or 2-3 years. These pressure washers typically have multiple parts, are difficult to replace, and less efficient than other pumps but do not have seals and are self-priming pumps.
Axial Cam
The axial cam is driven by the drive shaft. It also uses pistons to function. The axial pressure washer pump can create higher pressure compared to the wobble pump. Most axial pressure washer pumps will last approximately 500-850 hours or 3-5 years. These pumps are lightweight and compact. They are self-priming and allow for flow adjustment. However, these pumps use a seal that moves with the piston head, which can break down. These pumps also do not cool down as well as the triplex plunger pumps.
Triplex Plunger
The triplex plunger is camshaft driven. It uses plungers to function. These are professional grade pumps and not necessary for most homeowners. However, they are the top-of-the-line option. These pumps are highly efficient and cool themselves. The lifespan is close to 20 to 40 years as long as the pumps are well maintained. They also use seals that do not move with the piston heads so you won't experience leaks over time. The triplex plunger pumps are only found in the most expensive pressure washer options.
Pressure Washer Pumps Compared
Image | Product | Pump Type | PSI | Check Price |
|---|---|---|---|---|
 | Annovi Reverberi SRMW22G26 | Triplex plunger | 2600 psi | |
CAT Pumps 66DX40GG1 | Triplex plunger | 4000 psi | ||
No products found. | CANPUMP Triplex | Triplex plunger | 3000 psi | |
OEM Technologies Horizontal | Horizontal axial | 3100 psi | ||
Briggs & Stratton 207365GS | Axial | 2350 psi | ||
PEGGAS | Axial, vertical | 3000 psi | ||
AAA Technologies | Triplex plunger | 3400 psi |
Choosing a High-Quality Pressure Washer Pump
Compatibility with Pressure Washer
Consider the type of pressure washer that you will be using and whether or not the type of pressure washer pump you choose is compatible with that pressure washer. Always review the horsepower required to make sure that your pump is compatible with your pressure washer.
Pressure Level (PSI)
The pressure level, or PSI, measures the amount of force of the water pushed through the machine. We recommend choosing a model with a PSI of 2,000 to 4,000. However, most models with those PSI numbers will be gas-powered. If you prefer an electric model or simply want to save money, you may want to choose a pressure washer pump with a PSI of 1,200 to 1,800.
Flow Rate (GPM)
The flow rate, also known as GPM (or gallons per minute), measures the amount of water moving through the pressure washer. This flow rate has nothing to do with pressure, however. We recommend a flow rate between 2 and 4 GPM. The higher the flow rate, the more water available. When a high flow rate is combined with a high PSI, the pressure washer will be more powerful.
Material Type
Look for noncorrosive and nonabrasive pump build materials that are compatible with the liquids and detergents you want to use. Aluminum alloy and steel are high-quality commonly used materials for pressure washer pumps that work well with most liquids and detergents.
Ease of Installation
Consider how difficult the pump will be to install with your current pressure washer set-up. Some pumps require professional installation because they have intricate pieces or problematic connection valves. However, other pumps are easy to install and can be easily installed by homeowners.
Additional Features
We recommend choosing a pressure washer pump that includes a thermal relief valve because this prevents overheating, which is one of the main reasons for pump breakdowns. We also recommend reviewing the maximum water temperature because the higher the maximum water temperature allowed, the more durable the pump. Pumps with 200-311°F also require less cleaning and do not need as much detergent.
Chemical Injection System
A chemical injector system is present on most pressure washer pumps. This system keeps the water and chemicals separate while the pressure washer operates. Both upstream and downstream chemical injection systems are used on pressure washers. We recommend the downstream injector system because it is the most commonly used system, easiest to replace, and most efficient.
Price & Warranty
Most pressure washer pumps come with warranties ranging from one year to three years, but some may have an extended warranty of up to five years. Consider the warranty length in comparison to the cost of the pump.
7 Best Pressure Washer Pumps Reviewed
1. Annovi Reverberi SRMW22G26
Annovi Reverberi SRMW22G26
Our Top Pick
Pump Type | Triplex plunger |
GPM | 2.2 GPM |
PSI | 2600 psi |
Max Water Temp | 140 Fahrenheit |
Compatible Pressure Washer Brands | Universal replacement |
Warranty | Yes, one-year limited warranty |
The Annovi Reverberi SRMW22G26 is the best pressure washer pump for many people because it is affordable and practical. This pump model is also a universal replacement model, which means that it works with most store-bought vertical engine pressure washers. If you look at your pressure washer and see that the pump is located directly below the engine (vertically), then this pump should work for your machine.
We recommend looking at your pump’s part number and comparing it to this model’s part number: “SRMW22G26.” This model is intended for gas engine units. This model has an easy start system, which allows for quick operation even with cold water starts. A built-in unloader and chemical injector are included. A thermal relief valve also helps the pump avoid overheating. To install, this model is mounted directly on top of the engine shaft.
Vinny wrote on Toolbarn,
“I had to replace a pump on a pressure washer. This pump was the replacement. With the new pump installed, the pressure washer was like new.”
This pump is built with a die-cast aluminum alloy body. Users have reported that this pump is difficult to replace and may require a handyman for installation. The attached hose coupler is also made out of plastic, and some users found that they cracked the coupler during installation. Purchasing brass hose couplers could fix this problem. The Annovi Reverberi SRMW22G26 does come with a one-year limited warranty. If you want an affordable pressure washer pump that fits most standard pressure washers, then this part is a great option.
Pros
Cons
2. CAT Pumps 66DX40GG1
best For 4000 pSI
Pump Type | Triplex plunger |
GPM | 4.0 GPM |
PSI | 4000 psi |
Max Water Temp | 140 degrees Fahrenheit |
Compatible Pressure Washer Brands | Most gas-powered engines |
Warranty | Yes, one-year limited warranty. |
The CAT Pumps 66DX40GG1 is the best 4000 PSI pressure washer pump on our list. It is powerful with 4,000 PSI and has a healthy 4.0 GPM flow rate. This pump fits most gas-powered pressure washer machines and delivers intense cleaning power for both homeowners and businesses.
This model uses the superior triplex plunger design for significant power with a fast flow rate. A built-in chemical injector is easy to use, and each plunger is built with ceramic for superior durability. This model does not include a thermal relief valve but can handle up to 140°F water. It can easily be added to your pressure washer and installed without professional help.
This model is expensive, but it is one of the best pressure washer pumps that money can buy.
Steve wrote on Northern Tool,
“This is an excellent upgrade or replacement pump for the 3.5 GPM. I use the Northern Honda/Cat machines and have purchased 6 of them over the years. You'll be shocked at how much more cleaning power you’ll have over a 3.5 GPM and wish you had bought one sooner. I'm getting almost 5 GPM out of these 4 GPM's. Our surface cleaners are humming and cleaning better with the extra output and the rinsing and re-sanding paver joints is quite a bit faster. CAT pumps are definitely worth the extra money for the reliability and performance."
Pros
Cons
3. CANPUMP Triplex
No products found.
best triplex pump
Pump Type | Triplex plunger |
GPM | 3.1 GPM |
PSI | 3000 psi |
Max Water Temp | 140 degrees Fahrenheit |
Compatible Pressure Washer Brands | 6.5 HP engines, ¾ crankshaft |
Warranty | Yes, 30-day limited warranty |
The Canpump Triplex pump is the best triplex pressure washer pump. We like that this model has an active 3000 PSI and 3.1 GPM flow rate. This model fits with 6.5 HP engine pressure washers that require a ¾ inch crankshaft connection. The Canpump brand is Canadian and is well known for creating affordable yet powerful product replacement parts.
However, users did point out that the unloader on this model lacks durability and may need to be replaced. A thermal relief valve is also included and helps this pump avoid overheating. This model also includes an easy start valve to handle cold water as well.
This pump is primarily made with brass pieces that are both strong and reliable. Other pieces, such as the crankshaft, are made out of die-cast aluminum. The plunger is made of ceramic parts as well as stainless steel parts to avoid everyday wear and tear.
The bolt-on pressure adjustable bolt in-line water filter protects the pump from mineral deposits and clogs. This pump does come with a 30-day warranty, however, which is one of the worst warranties available in the marketplace. If you want to get a strong and powerful pump at an affordable price for a pressure washer with a 6.5 HP engine, we recommend this model.
Pros
Cons
4. OEM Technologies
Top rated
Pump Type | Horizontal axial |
GPM | 2.5 GPM |
PSI | 3100 psi |
Max Water Temp | 140 degrees Fahrenheit |
Compatible Pressure Washer Brands | Most brands up to 3100 PSI, ¾” flange size |
Warranty | Yes, one-year limited warranty |
The OEM Technologies Horizontal Axial Cam is the best axial cam pressure washer pump on our list. This pump has a strong 3100 PSI and a 2.5 GPM flow rate. We like this model’s double seal system because it prevents leaks as the system ages. The brass head is connected to a die-cast aluminum crankcase.
Stainless steel pistons add additional longevity to this model. The pump also comes with thermal relief protection to prevent damage from hot temperatures. An unloader is built-in to this model for a smooth start. The gas engine flange is a universal fit and will fit most axial pump pressure washer engines.
Mi wrote on Tractor Supply's website,
“Purchased years ago, neighbors and friends have used the heck out of it. Minimal maintenance. Change the engine oil and new gas each year. Will purchase another if this one ever breaks."
This pump can withstand up to 140°F water and comes with a one-year limited warranty. Users did report that this model comes with complicated installation instructions. It might be frustrating to install on your own; however, a professional handyman could easily install this model.
Users also noted that the cheaper brass mounts on this model break down faster than the high-quality parts found in the pump. This won't be a problem for most, but if you notice that a brass mount is loose, we recommend replacing the mount so that the pump continues to last. If you want an affordable, high-quality axial pump, then this is the best option for you.
Pros
Cons
5. Briggs & Stratton 207365GS
best universal pressure washer pump
Pump Type | Axial |
GPM | 2.0 GPM flow rate |
PSI | 2350 psi |
Max Water Temp | 120 degrees Fahrenheit |
Compatible Pressure Washer Brands | Universal fit, Briggs & Stratton specifically |
Warranty | Yes, one-year limited |
The Briggs & Stratton 207365GS is the best universal pressure washer pump. Briggs & Stratton is a well-respected brand in the pressure washer world, and their pressure washer pump model can be used with most pressure washers. This axial pump has a strong 2350 PSI and 2.0 GPM flow rate.
However, this is a lower PSI and GPM compared to other models on our list. If you have a lower input and output pressure washer, then this is a great pump replacement model for you. If you need a higher input and output replacement pump, check out the CAT Pumps 66DX40GG1.
This model comes with 6 bolts and a new shaft key for easy installation. Users have noted that this pump is one of the easiest to install. Most users can install this model within ten minutes. This model is slightly more expensive than other axial pump models, but the build parts are significantly higher quality.
This pump is an OEM part for Briggs & Stratton pressure washers consisting of brass, aluminum, and stainless steel parts. An unloader level is built-in on this model as well as a thermal relief valve. This pump is less likely to overheat and has strong seals to avoid water leaks. If you want a high-quality axial pump, then this is a great choice. This model also comes with a one-year limited warranty.
Pros
Cons
6. PEGGAS
best vertical pressure washer pump
Pump Type | Axial, vertical |
GPM | 2.5 GPM |
PSI | 3000 psi |
Max Water Temp | 104 degrees Fahrenheit |
Compatible Pressure Washer Brands | Universal, ⅞” flange, vertical engine |
Warranty | No warranty |
The PEGGAS is the best vertical pressure washer pump. This model has a steady 3000 PSI and a 2.5 GPM flow rate. This model is easy to install because of its simple instruction manual and its high-quality mounting bolts. These bolts are made out of stainless steel and hold the pump together. Other components are made out of brass and aluminum. This model offers safe water pressure for cleaning your home and cleaning your car.
To measure your own mounting system, PEGGA provides detailed mounting bolt measurements. From the center flange to each of the mounting bolts, there is a 4" center spacing. The brass head on this pump and the self-suction prevents leaks. This pump can withstand a max water supply temperature of 104°F.
Users have reported, however, that the PEGGAS company offers no warranty and poor customer support. This pump is an affordable quality part, but it does not offer the warranty that most pressure washer pumps offer. The customer support is also unavailable. However, this pump from PEGGAS is easy to use and easy to install. If you want an affordable pump that can quickly be installed, then we recommend this model.
Pros
Cons
7. AAA Technologies
best Pump for commercial pressure washers
Pump Type | Triplex plunger |
GPM | 2.5 GPM flow rate |
PSI | 3400 psi |
Max Water Temp | 140 degrees Fahrenheit |
Compatible Pressure Washer Brands | Universal, most horizontal shaft engines |
Warranty | Yes, five-year limited warranty |
This pump from AAA Technologies is the best commercial pressure washer pump on our list. This pump is a triplex plunger model that was designed for commercial applications. It is expensive, but built to last and offers a powerful 3400 PSI. A 2.5 GPM flow rate and an advanced oil seal keep this pump moving and help avoid leaks. The crankcase is made entirely from die-cast aluminum.
You won't need a dipstick because there is a sight glass available on this pump. The pump comes with oil and is both pre-sealed and pre-filled. The pistons are made with a ceramic coating to ensure that the pistons do not overheat the pump. Additional parts are made from brass and plastic. Radial ball bearings are oversized for maximum mount support.
Thermal relief protection in the form of a thermal relief valve is present in this model, so you won't need to worry about overheating. An adjustable unloader system makes it easy to adjust pressure as you work to find the best water pressure for your cleaning needs. This model is expensive, but it has one of the best warranties in the industry with a five-year limited warranty on all parts.
This model also has plastic valve retainers, which may wear out over time but are easy to replace. If you want a high-quality triplex plunger pressure washer pump for a horizontal shaft engine, then this is a great purchase.
Pros
Cons
Comparing Top Pumps Brands
The best pressure washer pumps are made by brands such as Briggs & Stratton, CAT, OEM Technologies, Generac, Dewalt, AAA Technologies, and Simpson. These brands all manufacture pressure washers as well as pressure washer pumps.
The most important aspect of choosing a pressure washer pump is ensuring that the pump is compatible with your pressure washer (axial pump or triplex pump, wobble pumps are not replaceable).
Match your current pump’s PSI and GPM to a replacement and then ensure that your pump’s measurements are compatible with the mounting flanges. Most manufacturers use the same pump measurements for the mounting flanges.
Finally, review the features and specs available from each brand as well as the price. Choose the pressure washer replacement pump that makes the most sense for your needs.
Installing a New Pressure Washer Pump
To install a new pressure washer pump, you will need first to gather your replacement pump part and the tools that you need. During this process, you will take a few parts from your old pump and add them to your new pump.
Then, you will mount your new pump to your pressure washer. To remove the old pump, you will want to remove the spark plug wire, the hoses, and the bolts. A simple screwdriver can remove both the spark plug wire and hoses. Use a wrench to remove the bolts. As you unscrew the bolts, make sure you can catch the pump so that it does not slam into the ground.
Next, check your new pump for a thermal relief valve. If one is not present, take the thermal relief valve from your old pump and install it on the new pump. The thermal relief valve will help maintain your pump and keep it from overheating. Start by screwing the bolts in on your new pump to mount it securely to your pressure washer.
From here, simply connect the chemical injection tube, inlet hose, and outlet hose from your new pump to your pressure washer. Then, you can connect the spark plug wire and test your pressure washer. You are now ready to clean.
How to Fix & Maintain a Pressure Washer Pump
One of the most common problems with pressure washer pump performance is low pressure. If you notice that your nozzle is spraying in a partial pattern, your nozzle head may be blocked and creating low pressure. Try cleaning the nozzle or replacing it entirely. If you still have low pressure, you may want to look at the water supply. Are any of your hoses blocked?
Your pressure washer needs a consistent supply of water to pump normally. The unloader valve is also an important component in maintaining water pressure. If your pump struggles with low pressure, adjust the unloader valve. Adjust slowly (increase pressure gradually) because too much of an adjustment can create damage to the unloader valve.
If you cannot fix your low-pressure problem or other pressure washer pump problem on your own, we recommend calling in a professional handyman. You may need to purchase a replacement part to fix your pressure washer pump.
This is also the best time to invoke your warranty coverage if you are still under warranty for your pressure washer pump. Small bolts and seals are often covered under warranty.
People also Ask (FAQs)
How do I adjust pressure on a pressure washer pump?
To adjust the pressure on a pressure washer pump, you should change the nozzle. Do not adjust the unloader. Smaller openings on a nozzle head will lead to stronger pressure, while larger openings on a nozzle head will offer low pressure. This video from PowerWash explains this concept in greater detail.
How do I know when it is time to replace my pressure washer pump?
You should replace your pressure washer pump if the pump fails or if you notice that the pressure is low because of a seal leak issue on your pump. Most pressure washer pumps must be replaced every 2-5 years (axial piston and wobble piston) or every 20-40 years (triplex plunger).
What is the best pressure washer pump oil? How often should I change oil?
The best pressure washer pump oil depends on your pump type. Always choose synthetic oil when possible. You should change your pump oil approximately every three to nine months, depending on how often you use your machine. Plan to change the oil every 200 to 300 hours of use, or at a minimum every nine months. You can change your pressure washer’s engine oil at the same time to stay on top of maintenance and prolong the life of your machine.
Why do pressure washer pumps fail?
Pressure washer pumps fail most often because of overheating and general wear and tear. There is not much you can do about general wear and tear, but avoiding overheating is something that users can avoid. To prevent overheating, shut down your pressure washer if you are going to be leaving it unattended for any amount of time. Your pressure washer should not continue to run through when not being used. Most pressure washer manufacturers recommend not allowing your pressure washer to spend more than one minute in bypass.
Where can I buy pressure washer pump replacement parts?
We recommend purchasing pressure washer pump replacement parts through Amazon. They stock a wide variety of pump replacement parts at affordable prices and carries the most affordable brands as well as the most expensive high-quality pressure washer brands.
Conclusion
A pressure washer can help you clean your home or business with ease. If you want the top-of-the-line solution, we recommend the CAT Pumps 66DX40GG1.
This high-powered triplex pump model features a high PSI, GPM flow rate, and is a universal fit for most gas-powered pressure washer engines. If you need a more affordable triplex pump solution, we recommend Annovi Reverberi SRMW22G26.