Best Gas Pressure Washer with Soap Tank (2026): 4 Picks Compared

Compared on paper

*Cleaning units = PSI x GPM. Specifications are manufacturer rated, as published on each listing and collected 30 October 2026.

How the points were given

Each washer is scored on performance, build, value, safety and warranty, using only what the listing publishes. The How We Pick page describes the weights. Safety points go only to the listing that states safety features, and warranty points only where a term is stated.

Scores run from 9.2 to 9.8: each product’s point total is placed on that range, so more points always means a higher score.

What the listings tell you

All 4 listings state PSI and GPM. 3 name a soap tank, and 1 names a soap nozzle with detergent mixing but no tank. Only 1 listing states a California restriction, and 1 listing states no warranty term.

Buying guide: the best gas pressure washer with soap tank

PSI and GPM

PSI cuts grime and GPM rinses it away, so compare both figures together. The Homdox listing states 4200 PSI at 4.0 GPM, the Westinghouse listing states 3600 PSI at 2.7 GPM, the Ezasin listing states 3500 PSI at 2.3 GPM, and the Simpson listing states 3200 PSI at 2.5 GPM. Cleaning units, PSI x GPM, put those pairs on the same scale, with the Homdox pair at the top and the Simpson pair at the bottom. Nozzle angles also shape the wash: the Westinghouse set lists 0, 15, 25 and 40-degree tips plus soap, the Simpson set lists 0, 15 and 40-degree tips plus soap, the Ezasin set lists 0, 25 and 40-degree tips plus soap, and the Homdox set lists 0, 15, 25 and 40-degree tips plus a soap nozzle.

Soap tank versus soap nozzle

A soap tank holds detergent on the machine, while a soap nozzle only applies it. The Westinghouse, Simpson and Ezasin listings name a soap tank, and the Homdox listing names a soap nozzle with detergent mixing but no tank. For a wash that starts with soap, a named tank beats a nozzle alone, so check the listing wording before buying. Tank wording varies: Westinghouse says onboard, Simpson says built-in, and Ezasin names a soap tank without a size word, so none of the 3 tank listings states a tank capacity. That gap matters when planning a long wash, since no listing states how far a tank fill goes.

Hose, wheels and weight

Hose length sets reach: the Westinghouse listing states a 35 ft hose, and the Simpson, Ezasin and Homdox listings state a 25 ft hose. The Simpson listing also names a 16-inch spray wand, and the Westinghouse listing names a spray gun and wand, so both add wand reach beyond the hose itself. Wheels run from 10-inch tires on the Westinghouse and Ezasin listings to 12-inch never-flat wheels on the Simpson listing, while the Homdox listing names large rubber wheels with no size stated. Weight is stated for 3 picks: 79.0 pounds for Westinghouse, 63.0 pounds for Ezasin and 50 pounds for Simpson, while the Homdox listing states no weight.

Warranty and California notes

Warranty terms differ across the set. The Westinghouse listing states a 3 year limited warranty, the Simpson listing states engine, pump, frame and accessory terms, the Ezasin listing states 1 Year, and the Homdox listing states no term. Accessory coverage runs only 90 days in the Simpson terms, while the frame term runs 5 years, so read which part each term covers before judging the warranty as a whole. The Simpson listing states 49-state compliance and no sale in California, so check that note before buying in California.

Garage Fit Check

• Check the listed dimensions against the storage bay before buying, since gas washers need floor space plus room for the hose and wand.
• Run gas washers outdoors, never in a closed garage, and keep the work area clear of people and pets.
• Wear eye protection and never point the jet at people, pets or electrical parts.
• Check the nozzle set and hose length against the driveway and car wash jobs planned, and confirm the soap setup before a wash.
• Keep spare nozzles with the machine so the soap nozzle is at hand for the wash.

FAQ: garage tools

Does a gas pressure washer need a soap tank for car washing?

No, but a tank makes soaping faster. The Westinghouse, Simpson and Ezasin listings name a soap tank, while the Homdox listing names a soap nozzle with detergent mixing.

What PSI and GPM suit a driveway?

Driveway cleaning is named in all 4 listings, with PSI from 3200 to 4200 and GPM from 2.3 to 4.0 across the set. Higher GPM rinses soap and grit away faster, while higher PSI cuts stuck grime.

Can a gas pressure washer run inside a garage?

No. Run gas washers outdoors, never in a closed garage, and keep the area ventilated while the engine runs.

Which listing states no warranty term?

The Homdox listing states no warranty term, while the other listings state terms from 1 Year to a 5-year frame term.

What nozzle angles come in the sets?

The sets list 0-degree through 40-degree tips plus soap nozzles, with the Simpson set missing a 25-degree tip and the Ezasin set missing a 15-degree tip.

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