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First thing to look at is the pump mfg. Cat brand pumps are about the best of any and most used for commercial/industrial machines but also come at a premium price. Problem with the less priced units without Cat brand pumps is that you can't find parts or replacement pumps and if you do, they cost more than replacing the entire unit. Heat is something to seriously consider along with actual delivered pressure. While a cold water unit will clean, hot water is far better for cutting grease and oil especially if you go with high pressure soap injection (chemical pick-up on suction side of pump). I have an old Hotsy unit I purchased used at auction for $150 and put another 150 bucks into to repair some minor problems. Has a Cat 3500 psi pump that delivers 3100psig at the end of a 75' hose. Fired with #2 oil this unit does work well but leaves a distinct fuel oil smell lingering. Kerosene fire ones burn cleaner and rarely leave a smell. Hydro-Tek is another good brand to look at but these are not cheap but most all have Cat pumps. If you're looking for the occasional use unit, the ones from Northern or such places may fully suffice your needs without breaking the bank. If you're looking for a heavy use unit, I suggest taking a serious look at a Hotsy, Hydro-Tek or equal quality brand.
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