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Old 01-11-2018, 04:42 PM   #11
flybouy
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Originally Posted by JRTJH View Post
I'm no plumber, so someone jump in here if I don't explain this correctly. "Satisfactory shower head performance" depends on two factors. First is pressure. Typically any pressure greater than about 35 or 40 PSI is suitable. The second, and just as important, maybe even more important is volume. If you don't have sufficient volume of water flowing through the pipes, it will just trickle out of the shower head no matter if the pressure is 40 or 80 PSI.

Now, most "non-adjustable" tube type (CHEAP) pressure regulators, the $5 plastic ones and the $10 brass ones, usually restrict water flow so much that the volume of water flowing into the trailer is less than 3 or 4 GPM. That sounds sufficient, but when flowing through a 25' half in hose, into the city water connector, through several valves, fittings, being split so half goes to the cold water side and the other half goes to the hot water side and is further restricted by the valves there, it doesn't take much volume reduction to make an otherwise suitable shower turn into a "dribbler".....

I'd suggest getting a good, high volume pressure regulator, one that flows 6 or 8 gallons per minute and adjust it to 40 PSI. You'll likely see a much improved shower experience with a quality shower head. Oh, and don't think that Keystone installs quality shower heads in most of their trailers. A trip to an RV store for an Oxygenics head will almost always bring a smile in the shower.

Think of it this way. Aupply 400 PSI of water pressure through a "pinhole" at the faucet, connect a 25' hose and all you'll get out the other end is a dribble. Now, increase that pinhole to a 1/2" hole and you'll get enough pressure at the other end of the hose to knock the decals off your trailer..... It takes both pressure AND volume to be "workable" for most open ended water functions such as a shower head.
X2 on the Oxygenic shower head and good regulator. I would add in my experience that using a 5/8" hose and a 10" filter improved the flow rate for me.
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Old 01-11-2018, 04:45 PM   #12
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Been using one like this going on a year... with great results! I set it to 55#.
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Old 01-12-2018, 04:55 AM   #13
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Well most newer RVs are using the pex water lines so they should be capable of using the same pressures as your bricks and sticks home. Not sure why they say to limit the pressure to 40 something except that may cover all RVs being some still out there have the older style water lines. Even the faucets are residential quality in the newer RVs.
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Old 01-12-2018, 08:21 AM   #14
JRTJH
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Well most newer RVs are using the pex water lines so they should be capable of using the same pressures as your bricks and sticks home. Not sure why they say to limit the pressure to 40 something except that may cover all RVs being some still out there have the older style water lines. Even the faucets are residential quality in the newer RVs.
PEX lines with PEX fittings (used in residential construction) are rated well above 40 PSI. PEX lines with ABS (schedule 20) fittings (used in RV applications) is not rated as high as "better quality fittings" would be. When you add the "lesser quality fittings" and put the plumbing in an environment that "shakes, vibrates and rattles" down the highway, it's not going to stand up to the same "reliability standards" as residential construction that never moves once it's "water tested" not to leak. There's a significant difference in the environment where the PEX is used.

I can't speak to "current model" trailers, but I can say that my 2011 Springdale and my 2014 Cougar XLite were both fitted with Phoenix faucets. They are NOT residential quality, they are plastic faucets with "residential valves". Sure they "look like residential stuff" but that's the end of it. Any time you can go on Amazon and buy a complete Phoenix faucet for $18.99 with free shipping, you can't consider it "equal to" a $189 Delta faucet from Home Depot.

Those two factors, Cheap fittings that get shaken around in transit and cheap faucets that look good but ain't, are the main reason why RV water pressure recommendations don't parallel home construction PEX plumbing pressure recommendations.
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Old 01-12-2018, 03:09 PM   #15
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Been using one like this going on a year... with great results! I set it to 55#.
This is the same regulator we use. I have it set at 45psi. The pressure and flow are about the same as we get from the on board water pump when we use it.
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