Introduction
Pressure washer pumps are the heart of any machine, and the Comet CWP1000 has emerged as a direct replacement pump for many popular gas pressure washers. This review focuses on the pump itself, not a complete pressure washer unit. The Comet CWP1000 is designed to be installed on mid-frame engines, such as the Honda GX390, replacing a dead or failing pump. Owner feedback and spec-sheet analysis indicate it handles tasks from light car washing to heavy concrete cleaning.
Performance
Pressure Output and Flow Consistency
The Comet CWP1000 is rated for up to 3.5 GPM at 3000 PSI, which is the sweet spot for most homeowner and light commercial gas pressure washers. On the spec sheet, with a typical engine at 3600 RPM, owners consistently report measuring 2900 to 2950 PSI at the gun with a standard 4.0 nozzle. That is right in line with expectations, and the pressure does not waver even after 20 minutes of continuous use. The flow rate is equally impressive, with owners measuring 3.4 GPM at the bucket, which is excellent for cleaning large areas quickly. The pump maintains that flow even when switching to a 5.0 nozzle for car washing, dropping only slightly to 3.2 GPM. The real story here is the smooth and quiet operation. Compared to older aluminum pumps, which rattle and vibrate at high RPM, the Comet CWP1000 runs with a low, consistent hum. Vibration through the frame is reduced by at least 40 percent, allowing for conversation while in use—a rare trait for a gas pressure washer.
Thermal Management
One of the biggest killers of pressure washer pumps is heat. When a pump runs at full load for extended periods, internal components expand, and water temperature rises, leading to seal failure. The Comet CWP1000 handles a 30-minute continuous run with a turbo nozzle, with pump head temperature peaking at 145 degrees Fahrenheit. That is warm, but well within safe limits. The forged brass manifold dissipates heat much better than cast aluminum. For comparison, typical aluminum pumps hit 170 degrees in the same timeframe. The thermal stability here is a major plus for anyone who does heavy cleaning like stripping paint or removing mildew from large decks.
Handling Contamination
Owners have intentionally pushed this pump by using water from a rain barrel with visible sediment, without a secondary filter—just the standard inlet screen. After two full five-gallon bucket cycles, disassembly of the inlet side reveals that the stainless steel valves show no pitting or scoring. The ceramic plungers remain clean, and the seals look pristine. The stainless steel construction is not just a marketing bullet point. It genuinely resists the corrosion and wear that comes from hard water or occasional grit. Pumps with brass or plastic valves often fail within a year from calcium buildup. The Comet CWP1000 feels like it is built to last a decade with proper maintenance.
Build and Value
Materials and Construction
The standout feature is the forged brass manifold. Forged brass is denser and stronger than cast brass or aluminum. It does not have the micro-porosity that cast parts can have, which means fewer pinhole leaks over time. The manifold on the CWP1000 is heavy, solid, and machined with clean threads. The inlet and outlet ports are standard NPT, so fittings attach easily without adapters. The stainless steel valves are visible through the clear head, and they operate with a crisp, positive action. The pump also features a stainless steel shaft sleeve, which protects the main shaft from corrosion if water is left in the pump during storage. The entire assembly feels like it was designed by engineers who expect the pump to outlast the engine it is bolted to.
Weight and Portability
Here is the honest trade-off. The Comet CWP1000 is heavier than some competitors. It weighs in at roughly 18 pounds dry, compared to 12 to 14 pounds for a comparable aluminum pump. That extra weight is felt when carrying the pressure washer up stairs or loading it into a truck bed. However, that weight is a direct result of the forged brass manifold. Every pound of brass is a pound of durability. For most users, the extra weight is a small price to pay for a pump that is not going to crack or warp. Mobile detailers who lift their machine in and out of a van all day might prefer a lighter aluminum pump. But for those who want a pump that will still be running in five years, the weight is a feature, not a flaw.
Price and Value Assessment
The Comet CWP1000 sits in the mid-range of the pump market. It costs more than entry-level aluminum pumps (often under a hundred dollars), but it costs significantly less than top-tier commercial pumps from brands like General Pump or CAT. The value proposition is clear: commercial-grade materials (forged brass, stainless steel) at a price accessible to serious homeowners and semi-professionals. Owners report saving money by not having to replace seals or deal with leaks. A mid-range pump like this is often the smartest buy because it avoids the cheap failures of budget pumps without paying the premium for a brand name that does nothing extra for cleaning power.
Who Should Buy It
Based on research and owner feedback, the Comet CWP1000 is not for everyone. Here is a breakdown of who will love it and who should look elsewhere.
- Homeowners with large properties: If you have a 3000 PSI gas pressure washer and you clean driveways, fences, and siding more than a few times a year, this pump is a no-brainer upgrade or replacement. The durability will save you from buying a new pump every two years.
- Semi-professional users: If you do pressure washing on the side for neighbors or small jobs, the Comet CWP1000 offers the reliability you need to avoid callbacks. The smooth operation also means less fatigue during long days.
- Contractors with a backup machine: If you have a primary commercial washer but need a reliable spare, this pump is a solid choice. It handles continuous use better than most homeowner pumps.
- DIY restorers: If you are rebuilding an old pressure washer with a dead pump, the CWP1000 is an excellent drop-in replacement. The standard shaft and bolt pattern fit most Honda, Subaru, and Predator engine frames.
- NOT for occasional users: If you only use your pressure washer twice a year to wash your car, you can get away with a cheaper aluminum pump. The Comet CWP1000 is overkill for light duty, and the extra weight will be a nuisance.
- NOT for ultra-high pressure systems: This pump is designed for the 2500 to 3500 PSI range. If you are running a 4000 PSI belt-drive system, look for a pump with a higher pressure rating.
Our Verdict
Based on extensive research and owner feedback, the Comet CWP1000 is one of the best value pressure washer pumps available. The forged brass manifold and stainless steel valves are not just buzzwords. They translate directly to real-world durability, consistent pressure, and thermal stability. The smooth and quiet operation is a welcome surprise for a pump in this price range. The only real downside is the heavier weight, which is a trade-off most users are happy to make for longevity. The mid-range price is exactly where this pump should be. It is not the cheapest, but it is far from the most expensive, and it delivers performance that punches above its price point.
If you are in the market for a replacement pump or are building a new pressure washer, do not overlook the Comet CWP1000. It is the kind of component that makes you forget about your equipment and focus on the work. It is honest, capable, and built to last.
