Hello, we have  a 2011 class A bounder that always has very low water pressure when we use a cheap pressure regulator on the water hose. I talked with Fleetwood tech and they told me they test to 85 pounds but do not recommend a pressure. That leaves it wide open. I now have stumbled over a pressure regulator that allows one to regulate the max flow coming in from the faucet.  I suspect it is the bottleneck created by the internal water filter. This results in a shower water flow that just flows out of the shower head dropping straight down.  Any recommendations or comments about what seems appropriate and why? 

We have a Providence that has had low water pressure from day one. Numerous trips to the dealer never corrected the problem. Usually, we just deal with it. When I want optimum pressure, I just fill the fresh water tank and run off the pump. It easily doubles the water flow!  Sorry Mike Thompson RV, but I have to tell it like it is!

Water pressure and water flow are different things, but related.  Also, there's static water pressure and dynamic water pressure. 

Static water pressure is measured in Pounds per Square Inch (PSI) with all faucets off.

Dynamic water pressure is measured in PSI's with faucets open. In all cases it'll be less then static pressure.

Water flow is measured in Gallons per Minute (GPM) with faucets open.  This is a measure of how much water is flowing through your system.  Higher pressure will force more water through a restriction.  But removing the restriction will allow more water through at the same pressure. 

You can have great water pressure but terrible water flow. 

A pressure gauge connected to your motor home water system somewhere after your pressure regulator will show normal pressure (whatever your regulator is set to) when all faucets are off but you may still not have enough flow for a decent shower.

Water flow can be reduced by things like...
 A clogged pressure regulator. 
 I've found the barrel shaped ones you get at Camping World to be terrible.  They clog easily and cannot be cleaned. I bought a whole house pressure regulator (Watts model LF25AUB) from Lowes and mounted it permanently in my wet bay.  It's adjustable and cleanable.

 A clogged water filter.
 This is a ongoing problem for us as the park we're currently at seems to have rusty pipes. We've having to change our main water filter every two months.
 
 A restriction somewhere in your internal lines...
 Our coach had terrible hot water flow from day one.  It was finally discovered the check valves at the hot water heater were clogged with construction debris.  The hot water had to be removed, the lines blown out, and the valves replaced. 

 A small supply hose.
 If the hose you're using to connect your RV to the outside water faucet is of a small diameter it'll reduce your flow.  I've noticed a big difference with hoses.  Those collapsible hoses all have a small inside diameter and will reduce your flow.

My water flow problems were solved by adding the Watts pressure regulator, a large diameter rubber hose on the outside supply line and frequently water filter replacement.  I still have the small diameter collapsible hoses and will use them if I have to but I know they'll have a detrimental effect on my flow. 

 

Harv

I was having low flow issues and found the one way water inlet valve had broken and was blocking the water flow.  This valve is located right behind the female water hose connection on my 2007 Fleetwood Discovery 40X.   I just took the valve apart and removed the broken parts.  If you do this you will have to put a off/on valve on your hose to keep your on board fresh water from draining out.  I currently use an adjustable water pressure regulator set on 55 pounds without any problems.