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Old 02-17-2014, 04:59 PM   #1
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Maximum safe water pressure?

What is the maximum water pressure that would be in the safe zone on a new 5th wheel.

The reason I ask is that I have the tankless water heater on our Wildcat. The water heater requires a minimum flow of gallons of water and pressure to operate correctly.

It was even recommended that I remove any and all water flow restrictors in the trailer such as the low flow disc in the faucets in order to help with the flow of water.

Most of the water pressure regulators that you purchase will keep the water somewhere between 35-40PSI maybe as high as 45PSI.

With the current regulator I noticed that when flushing the lines if I have the sink faucet running and flush the toilet the sink flow almost turns into a trickle of water.

Our 5th wheel has 1.5 bath rooms, the outside shower and the kitchen sink as far as water flow destinations.

Would I be safe with a high flow water regulator that allows up to 55PSI?
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Old 02-17-2014, 05:05 PM   #2
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from an earlier post, the conclusion was that up to 60 psi is fine. Watts regulators with a gauge are high flow units and would be the choice for your application, I should think.

RVWATERFILTER Store is the place to go.

http://www.rvwaterfilterstore.com.
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Old 02-17-2014, 05:43 PM   #3
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the sink slowing when flushing toilet has nothing to do with pressure, its loss of volume. You only have a certain amount of water available through the small lines.
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Old 02-17-2014, 05:49 PM   #4
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I think all trailers these days have PEX tubing. The pressure rating of just the tubing is 100psi at 180F and 160psi at 74F. The connections, fittings, filter, and other pieces of the water system may be less.
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Old 02-17-2014, 05:52 PM   #5
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Quote:
Originally Posted by Narboza View Post
I think all trailers these days have PEX tubing. The pressure rating of just the tubing is 100psi at 180F and 160psi at 74F. The connections, fittings, filter, and other pieces of the water system may be less.
pressures like that, you will blow everything out of the toilet, not flush it down. I would say in the 50-55psi range would be safe and plenty sufficient, but you only have whats available from the spigot anyhow.
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Old 02-17-2014, 05:55 PM   #6
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Hi

I posted this to a similar thread last year

I cannot give you a figure for what would cause a bursting situation in the water lines or fittings but Im pretty confident in saying you won't get a dangerous level of pressure from any campground that would cause it. Pex can take alot of pressure if 'correctly installed'. That being said, just like your home you really don't want the water pressure into the camper to be much above 60psi. The pipes won't suffer but seals and O rings on faucets and fittings will over time. I'll test the pressure and only put the pressure reducer on if I think it's necessary otherwise you have to run around in the shower to get wet.
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Old 02-17-2014, 06:27 PM   #7
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We run about 45- 50 PSI on the camper but I am no expert but volume is what is needed and pressure is less the issue to maintain decent flow at the faucets.

The house maintains 28 PSI when it drops below that the pump comes on & shuts off at 42 PSI & goes back to maintaining 28 again when the pump stops. Our house at 28 PSI gives us plenty of volume but would not like the camper to have that amount as it would seem to give little water.
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Old 02-17-2014, 08:00 PM   #8
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From the water filter store.

Excessive pressure can cause your plumbing to leak or even rupture. It doesn't take long at high pressures to cause damage, even a fairly brief "spike" can do it. Pressure regulators are installed in your water supply line to limit the water pressure going into your RV. RV plumbing is normally rated at 125 psi, but you certainly don't need to use that much. However, 60-65 psi is a very comfortable pressure for faucets and showers. Parks don't always have that much, but when they do, having a regulator designed for good flow and pressure adjustability will allow you to take advantage of that better pressure without creating a problem with standard RV plumbing systems. Many higher end RV pumps that come on RVs have 65 to as much as 85 psi. New RVs often have their plumbing systems tested to 100 psi, or so, during the manufacturing process, but we recommend regulating incoming pressure to around 60-65 psi to provide a very nice operating system. OUR REGULATORS ALL COME EQUIPPED WITH BRASS HOSE FITTINGS, READY TO HOOK UP.
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Old 02-18-2014, 12:10 AM   #9
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This is probably a lousy idea, at least I thought it was when I heard it, but I'm going to throw it out there.

I was talking to another camper once who said he always suffered low pressure in his 5th wheel. To fix it, he routed his city water connection into his fresh water and ran everything off the freshwater pump instead. Unfortunately that's as much as I got out of the conversation so I never did find out how he dealt with all the problems I see with that approach, such as the overflow tube, excess wear on the pump, etc...
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Old 02-18-2014, 12:40 AM   #10
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