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Sun Joe SPX4003-ULT 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-ULT.

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-ULT
Sun Joe SPX4000Sun Joe SPX4003-ULT
  • Higher GPM
  • Lighter
  • Onboard storage
  • Higher PSI
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Given their common origin from Sun Joe, the SPX4000 and SPX4003-ULT should exhibit similar levels of quality and attention to detail.

Power Comparison

  • Fuel: Both units are corded electric pressure washers, ensuring uninterrupted power for extended cleaning tasks without the hassle of refueling or recharging.
  • Engine & Pump: Utilizing axial-type pumps, both the Sun Joe SPX4000 and the Sun Joe SPX4003-ULT are recognized for their lightweight construction and straightforward operation. The pump is driven by a 14.5-amp motor in either configuration.

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-ULT.

  • Pressure: The Sun Joe SPX4003-ULT generates a slightly higher force at its maximum reachable pressure of 2200 PSI, providing superior dirt and grime removal compared to the 2030 PSI of the Sun Joe SPX4000.
  • Water Flow: When operating at low pressure, the SPX4000 delivers a higher water volume than the SPX4003-ULT. Offering up to 1.76 GPM (gallons per minute) compared to the SPX4003-ULT's maximum flow of 1.6 GPM, it should ensure you to remove dirt and debris with greater effectiveness.
  • Cleaning Power: Since the difference in Cleaning Units between the Sun Joe SPX4000 and the SPX4003-ULT (1798 and 1815 CU, respectively) is negligible, it's safe to say that both devices offer the same level of overall cleaning efficiency.

Design Comparison

  • Design: With a hand truck setup, both units may exhibit variations in mobility due to factors such as their wheels and overall weight, as explained further in the following discussion.
  • Design: With a hand truck setup, both units may exhibit variations in mobility due to factors such as their wheels and overall weight, as explained further in the following discussion.
  • Weight: At an approximate weight of 27.8 lbs, the SPX4000 is marginally lighter. This feature suggests that it may be easier to transport and handle compared to the SPX4003-ULT, which weighs approximately 31 lbs.
  • Maneuverability: The inclusion of wheels on both products greatly enhances their maneuverability. Both products feature a foam-padded handle, designed to enhance your grip for improved comfort and control when maneuvering or transporting them.

Feature Comparison

  • Soap Addition: Both washers allow for the addition of chemical detergent solutions to the water. Whether you select the SPX4000 or the SPX4003-ULT, you'll appreciate their onboard soap tank, which ensures easy storage of cleaning chemicals, simplifying your cleaning tasks. With detergent tank sizes of 0.42 gal and 0.4 gal, respectively, both the SPX4003-ULT and the SPX4000 allow you to store roughly the same amount of cleaning solution.
  • Trigger Gun & Wand: While both units are equipped with a fairly standard ergonomic trigger gun, they vary in wand configuration: the Sun Joe SPX4000 is paired with a a classic wand, whereas the Sun Joe SPX4003-ULT comes with a an adjustable one.
  • Nozzles: The SPX4003-ULT 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: Each product comes equipped with a 20 ft high-pressure hose, ensuring comparable freedom of movement around the unit right out of the box. Featuring a 35 ft power cord each, both units offer identical placement flexibility from an electrical outlet.
  • Storage: In contrast to the SPX4000, which offers convenient onboard storage to keep your accessories at hand, the SPX4003-ULT does not have such a feature. Both washers come equipped with a set of hooks, ensuring tidy storage for their high-pressure hoses.
  • Accessories: In addition to the usual set of included accessories, the Sun Joe SPX4003-ULT also comes with wheel brush and utility brush.

TL;DR

Sun Joe SPX4000Sun Joe SPX4003-ULT
Sun Joe SPX4000Sun Joe SPX4003-ULT
  • Higher GPM
  • Lighter
  • Onboard storage
  • Higher PSI
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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