GPM - That depends on the type of work being done. Typically, a minimum of 4 GPM is needed. However, the higher your GPM, the more options you will have later when adding surface cleaners and other equipment. We offer the best pressure washers from 4 GPM up to 8 GPM. When washing a house, the most time is spent rinsing the floor. So, the more GPM you have,the less time you will spend rinsing. When cleaning concrete more GPM you have will allow you to use a larger diameter surface cleaner and push it faster.
Hot or cold – In general for residential cleaning only cold water is necessary. For commercial cleaning hot water is best. We offer both hot and cold pressure washing equipment. Our heated models feature 115-volt AC burners or 12-volt DC burners. The 115-volt burners have a built-in generator that supplies the burner with the 115-AC. The 12-volt model is powered by the engines charging circuit. In general, the 115-volt models are more dependable in the long run because the current drop is tolerated better in AC rather than DC. Additionally, over time lose or oxidized connections and engine RPM fluctuations can cause drops in the current.
If you want to add heat to an existing cold-water pressure washer you can add a hot box. If your pressure washing system has a charge circuit of at least 18 amp you can power a 12-volt DC hotbox, or you can run a separate generator to power a 115-volt AC hot box. Just use a pressure whip line from the outlet of the professional pressure washer to the inlet of the hotbox. Your pressure hose or hose reel hooks up to the outlet of the hotbox
The pressure washer drive types are direct, gearbox and belt.
Direct drives are fine for light duty use but do not pull well from tanks and are best to feed from a faucet. However, if you use a faucet to feed the pressure washing equipment you will be limited to 4 GPM and under. Gearbox and belt drives are used for a heavy use professional pressure washer and pull well from tanks.
Belt drives are more maintenance free than gearbox drives because of no oil to change or leak.
We offer both. For pressure washing systems that are mounted and pull from a tank, a skid frame is best because it is more easily mounted. Pressure washers that need to be moved around, of course, should be wheeled but only 4 GPM and lower pressure washers can be feed from faucets. The 5.5 & 8 GPM pressure washers must be hooked up to a tank and for that reason are almost always a skid unit.
Tricky question, because you want to use enough pressure to do the job at hand and not cause damage. You can buy and use a pressure washer that is rated and set at 4000 PSI and reduce the PSI using larger orifice nozzles when needed. For general cleaning purposes, 3000 PSI and lower is enough
If you have a wheeled pressure washer, they normally only have 100’ of the hose so they maintain mobility. Pressure washers mounted on a trailer, flatbed, etc. typically run anywhere from 200’ – 400’. These will usually have hose reels to store the hose on. Something to keep in mind is you will have a pressure drop for every foot of hose you have. On a 4 GPM pressure washer, the average drop is 1 PSI per foot. So over 400’ of hose, it will lower a 4000 PSI pressure washer to 3600 PSI.