Sun Joe SPX4003 vs SPX4000 - The Differences

Further down the page, you'll find some explanations regarding the key similarities and differences between the Sun Joe SPX4000 and the Sun Joe SPX4003.

But before checking out explanations regarding their power, design, and features here's a table that summarizes the main pros of each of these 2 pressure washers:

Sun Joe SPX4000Sun Joe SPX4003
Sun Joe SPX4000Sun Joe SPX4003
  • Higher GPM
  • Onboard storage
  • Higher PSI
  • Lighter
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As the SPX4000 and the SPX4003 are both Sun Joe pressure washers, they benefit from the same level of quality and attention to detail.

Power Comparison

  • Fuel: Both units are electric pressure washers.
  • Engine & Pump: The Sun Joe SPX4000 and the Sun Joe SPX4003 both use an axial-type pump to put water under pressure. In either case, the pump is powered by a 14.5-amp motor.

The following charts are provided to show you at a glance how the main specs of the Sun Joe SPX4000 compare to the Sun Joe SPX4003.

  • Pressure: With a maximum reachable pressure of 2200 PSI, the Sun Joe SPX4003 provides a slightly higher force to blast off dirt and grime than the 2030 PSI of the Sun Joe SPX4000.
  • Water Flow: When operating at low pressure, the SPX4000 can generate a higher maximum volume of water than the SPX4003. It can deliver up to 1.76 GPM (gallons per minute), whereas the SPX4003 offers a maximum water flow of 1.6 GPM. The former should thus allow you to rinse away dirt and debris with better efficiency and speed.
  • Cleaning Power: As the difference in Cleaning Units between the Sun Joe SPX4000 and the SPX4003 (1798 and 1760 C.U., respectively) can be considered negligible, we can say that both these devices share the same overall cleaning efficiency. Therefore, even though the Sun Joe SPX4000 has a lower pressure rating, its higher water flow makes it the superior unit.

Design Comparison

  • Design: Both units are constructed with a hand truck design. Therefore, if either of these 2 devices should provide better mobility, it would be due to its wheels and weight (which we detail just below).
  • Weight: With an approximate weight of 27.3 lbs, the SPX4003 is slightly less heavy than the SPX4000 (which weighs around 27.8 lbs).
  • Maneuverability: Both products benefit from a set of wheels, which greatly contributes to their maneuverability. Both offer a foam-padded handle, which improves your grip when you wish to move them.

Feature Comparison

  • Soap Addition: Both washers allow for the addition of chemical detergent solutions to the water. Whether you choose the SPX4000 or the SPX4003, you'll be able to store your cleaning chemicals in the unit's onboard soap tank. With detergent tank sizes of 0.42 gal and 0.4 gal, respectively, both the SPX4003 and the SPX4000 allow you to store roughly the same amount of cleaning solution.
  • Trigger Gun & Wand: While each of these 2 units comes with a fairly standard ergonomic trigger gun, the Sun Joe SPX4000 sports a classic wand, while the Sun Joe SPX4003 has an adjustable one.
  • Nozzles: The SPX4003 doesn't come with any nozzles (its aforementioned wand removes the need for any), but the SPX4000 is supplied with five (0°, 15°, 25°, 40°, and a soap nozzle).
  • Reach: Both products include a 20 ft high-pressure hose. Therefore, neither of them will, out of the box, allow for a higher freedom of movement around the unit. As both units feature a 35 ft power cord, their maximum allowable placement from an electrical outlet is the same.
  • Storage: In contrast to the SPX4000, which offers convenient onboard storage to keep your accessories at hand, the SPX4003 does not have such a feature. Both washers feature a set of hooks to help you neatly store their high pressure hoses when not in use.


Sun Joe SPX4000Sun Joe SPX4003
Sun Joe SPX4000Sun Joe SPX4003
  • Higher GPM
  • Onboard storage
  • Higher PSI
  • Lighter
Show all offers
Show all offers
1 Comment
  1. I have a SPX4000 purchased a few years ago. Used every 3 years, or so, for household power washing, i.e., vinyl siding, walkways, and steps. The unit was garage kept and I changed the pump oil to minimize wear and tear. During the 3rd use, the unit lost high pressure-likely due to normal wear and tear of the plastic pressure valves.

    To correct fluctuating pressure, the Owner’s Manual says “clean or replace the valves.” I contacted SunJoe Customer Service to purchase new valves knowing the unit IS STILL BEING MANUFACTURED. Customer Service “apologized”, but cannot identify/sell replacement valves. Instead, I should try Home Depot or a local hardware store.

    That is unacceptable customer service, so I wrote letters to senior management. They chose to ignore my request, as well.

    I was NOT asking for a new unit. I wanted to purchase three valves to return the unit to full functionality.

    Yes, this is a budget pressure washer and when it functioned, it was fine. However, budget should not mean disposable. For the cost of 3 plastic valves (maybe $15), SunJoe said throw the unit away.

    If you are okay with “buy cheap, get cheap”, then SunJoe is for you. If you expect something more, then vote with your wallet and support a manufacturer that stands behind its equipment.

    Don’t buy SunJoe.

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