| Feature | Colette Sigma | Kärcher HD Series | Simpson (Honda) | | :--- | :--- | :--- | :--- | | | Electric (Induction) | Electric (Universal) | Gas (Briggs/Honda) | | Noise level | Low (75 dB) | Moderate (85 dB) | Very High (95+ dB) | | Pump type | In-house Triplex | Axial cam | OEM Triplex (Annovi Reverberi) | | Maintenance | Low (oil changes) | Zero (disposable) | High (oil, spark plugs, fuel) | | Best use case | Daily residential/light commercial | Annual home use | Off-grid/heavy commercial |
A: This is the thermal overload switch. Unplug the unit for 30 minutes. Ensure you are using a heavy-gauge extension cord (12 AWG or lower) and no longer than 50 feet. Induction motors are sensitive to voltage drop. colette sigma
Completed the job in 28 minutes. The induction motor ran cool to the touch. The high GPM allowed the surface cleaner attachment to spin faster, and the triplex pump’s smooth output left zero "tiger stripes" (pressure lines) on the concrete. | Feature | Colette Sigma | Kärcher HD
You buy a because you are tired of throwing away plastic pressure washers every 18 months. You buy it because you value flow rate over inflated PSI numbers. You buy it because you want to hand a tool down to your child. Induction motors are sensitive to voltage drop
A: Avoid Amazon knock-off parts. Order directly from Colette's online spare parts portal using your model's "Sigma code" (located under the handle). Critical parts (unloaders, seals, spray guns) are standardized across the Sigma range. The Final Verdict: Is the Colette Sigma Worth It? Yes—but only for the right customer. The Colette Sigma is not a tool; it is an investment. It is heavy, expensive, and requires basic mechanical sympathy. However, in an era of planned obsolescence, the Sigma is a refreshing anomaly.