3500 psi and 4gpm

Weinersnitzelz

New member
Would a 3500 psi and 4gpm be sufficient for residential cleaning? Also would it run a 20" surface cleaner? I'm starting a company (with insurance and tax ID not a fly by night) the unit I have is a northstar washer from northern tool at 3500 and 4gpm. I have a 16 ft dual axel trailer with a 200 gallon tank also. I'm also looking into the softwash products to do roofs I want to take the training class AC offers and buy his products. Any help would be great.

Thanks.
 
It is just a direct drive. I was already thinking that I might need a centrifugal pump set up. Thanks
 
Is your pump capable of getting an external (tank) bypass plumbed in? If so I saw a post somewhere recently where the guy had his tank outlet plumbed into a T with the customers hose inlet... So effectively the pressure from the customer supply would directly 'jump start' your direct drive pump. Then when your fingers off the trigger the external bypass will top up your tank for you. Once there is a good amount of gallons ithe tank the sheer pressure of this should be enough to keep the pulp running, even if the customers supply went dead.... Right? Anyone confirm? :what:

Sorry I can't remember who's setup (or which forum) I saw this on or I would credit you!

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Ive washed houses for years on a 4gpm. Not sure why you need a tank unless youre out in the boonies or dealing with low pressure well water. That was the joy of a small machine, no tank needed. Ive washed 431,016 houses with a machine like that. But once I got a hold of an 8gpm, that smaller machine felt like a kids toy. And yes you can run a small surface cleaner. Make sure your nozzles are sized properly.
 
Thanks for the help, I have a tank because where I live and will service there are a bunch of well water systems. I like the idea of the T in the intake I've never thought of that.

Thanks for the ideas.
 
Thanks for the help, I have a tank because where I live and will service there are a bunch of well water systems. I like the idea of the T in the intake I've never thought of that.

Thanks for the ideas.

Found a pic of it for you...
Obviously that is customer water in on the left and tank/customer feed heading to the PW to the right.
6era2y8u.jpg


Again, sorry I can't credit the setup or picture!
 
Awesome! Thanks for the picture I think I will try this. I just wonder if the flow will be strong enough on startup to supply the PW since some of the water will be going into the tank (path of least resistance?)
 
I wondered that too. I guess you could always use a ball valve at the outlet of the tank which you could shut off to stop water going up and into the tank from the T... at least until your machine is charged properly.

A bit of a hassle and workaround but if there's one thing that working with pressurised water has taught me.. It's that where there's a will there's a way! Lol

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I use a 3K/4GPM (direct drive) w/ 19" Whisper Wash and have no issues. I also have a 225 gal tank, but it seldom gets used. When I actually get around to plumbing it, I will be incorporating a "feed pump" so I never have to worry about feed pressure.
 
Thanks for the input. Does anybody know what size nozzle tips I would need for my 20" surface with a 3500 psi and 4gpm?

I've been in this business in the past, I work for a fire equipment service company that installs and services kitchen vent hood suppression systems, so a few years ago I had a Hot Water pressure washer to clean hoods but never anything else. I want to get into the residential side, vent hoods are so messy!


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