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  1. #1
    Seasoned Camper
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    What is too much pressure?

    Hello, I have a question, What water pressure can our Grand Design RV's handle, I run the small regulator prior to the nautilus but I find it seems never enough. Mine is a preset 40 PSI. I have never heard an educated answer on what the plumbing in these units can handle in safe mode. I obviously do not want to start leaking water issues but would like to rinse the soap off my bald head. Should I use a fixed unit or adjustable
    Thanks and happy travels

    Click image for larger version. 

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  2. #2
    Fireside Member
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    GD told me 50-55psi
    2021 Grand Design Solitude 377mbs
    2019 Ford F350
    2022 Honda Pioneer 1000-5
    2004 Terry Quantum 255bhs

  3. #3
    King Pin
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    Definitely use an adjustable regulator, you'll get much better flow rate. The non-adjustable ones restrict the flow a lot. I actually hooked up a flow meter and checked the fixed pressure regulators and the adjustable. The adjustable allows a much higher flow rate, with the all metal non-adjustable ones trailing, and the ones with the plastic grip even less. IMO the best way is to hook up the regulator to your home faucet/hose, and lower the pressure setting to where you want it. I have mine set to about 60 psi. Works well.
    Howard and Peggy
    2019 Momentum 351M, and 2018 RAM Cummins dually 6-speed.
    His: 1999 Honda Interceptor
    Hers: 2013 Spyder ST-S

  4. #4
    Seasoned Camper
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    I use an adjustable one set at 60psi. I have converted almost all of the flex hose to PEX to eliminate multiple leak points. PEX fittings and 1/2" ID flex hose were never designed to work together. I also put in a 80psi pressure relief valve on the hot water outlet side of the 6 gallon Atwood water heater. It's amazing how much of a pressure spike it puts on the system when it fires up. My internal system pressure gauge regularly get to 80psi as the water heater heats up. I usually have about a gallon water in a bucket for each week of camping.
    Kevin and Jennifer
    2016 RAM 3500 Laramie Mega Cab CTD Aisin 4x4 SRW
    2019 Reflection 28BH (Built 2/2019)
    - 78" Theater Seat, Second AC, Dual Pane Windows
    - Sailun 235/85 R16 Tires
    Blue Ox Super Ride BXR7200 with a Demco Factory Prep Bracket 6099

  5. #5
    Long Hauler
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    Quote Originally Posted by Kevin2282 View Post
    It's amazing how much of a pressure spike it puts on the system when it fires up.
    Yes, the hot water heater really increases the static water line pressure
    2018 Dodge 3500 6.7 Cummins SRW w/Aisin
    2021 Reflection 303RLS
    New to RV'ing since 1997

  6. #6
    Seasoned Camper
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    Quote Originally Posted by Scott'n'Wendy View Post
    Yes, the hot water heater really increases the static water line pressure
    This is the pressure relief valve and PEX fitting that I used.

    https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1

    Drop ear PEX fitting

    https://www.amazon.com/dp/B08CC1854D...2s9dHJ1ZQ&th=1
    Last edited by Kevin2282; 06-14-2024 at 10:46 AM.
    Kevin and Jennifer
    2016 RAM 3500 Laramie Mega Cab CTD Aisin 4x4 SRW
    2019 Reflection 28BH (Built 2/2019)
    - 78" Theater Seat, Second AC, Dual Pane Windows
    - Sailun 235/85 R16 Tires
    Blue Ox Super Ride BXR7200 with a Demco Factory Prep Bracket 6099

  7. #7
    Long Hauler
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    Quote Originally Posted by Kevin2282 View Post
    I usually have about a gallon water in a bucket for each week of camping.
    Where did you place the prv.... Where you can place a bucket under it?
    2018 Dodge 3500 6.7 Cummins SRW w/Aisin
    2021 Reflection 303RLS
    New to RV'ing since 1997

  8. #8
    Seasoned Camper
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    Quote Originally Posted by Scott'n'Wendy View Post
    Where did you place the prv.... Where you can place a bucket under it?
    I put the PRV on the outlet feed from the water heater (Red Line). I put a plastic PEX valve on the bleed off side of the PRV incase it failed wide open. That way I could shut it and keep on using the water system. I also carry a spare PRV since they are relatively inexpensive. You can see the brass PRV in these photos.

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    I ran the PRV bleed off line (White Line) out the same hole as the low point drains to a 90 degree PEX fitting and then back to the sewer hose holders. At that point I put a 90 degree PEX fitting on the line and ran it to the left side of the trailer where I put another 90 PEX fitting to aim it straight down. The PEX line is zip tied to the side of the sewer hose holder. This allows me to put a 2.5 gallon Homer Bucket at the side of the trailer so I don't make a mud puddle.
    Kevin and Jennifer
    2016 RAM 3500 Laramie Mega Cab CTD Aisin 4x4 SRW
    2019 Reflection 28BH (Built 2/2019)
    - 78" Theater Seat, Second AC, Dual Pane Windows
    - Sailun 235/85 R16 Tires
    Blue Ox Super Ride BXR7200 with a Demco Factory Prep Bracket 6099

  9. #9
    Seasoned Camper RV2600RB's Avatar
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    I use a 50-55psi high flow fixed regulator.
    Itís an rv so I donít expect residential water pressure. It sure beats the days of creek and water bottle showers I used to have when camping.
    Rich
    '16 Ram 2500 CTD CC 4x4 / '21 Imagine 2600RB
    The Journey Is The Destination

  10. #10
    Long Hauler
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    I think I'll look into doing that.
    What is the other brass valve? A check valve...Black rinse?
    2018 Dodge 3500 6.7 Cummins SRW w/Aisin
    2021 Reflection 303RLS
    New to RV'ing since 1997

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