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Old 04-19-2019, 09:44 PM   #1
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Water pressure at 100 PSI???

I searched water pressure threads and couldn't find what I was looking for.

On my Hurricane inside the storage compartment where the water controls are is a plastic piece/plate around the water inlet and it states something like 100 PSI max.

I have never heard of anyone running that high of pressure. Has anyone seen that or tried it? I always understood less around 55-60 max. Next time at the RV I will get a pic of the plate. Thx, Dennis.
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Old 04-19-2019, 09:48 PM   #2
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Most folks seem to consider 60 psi as the "Outer Limits"...
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Old 04-19-2019, 09:55 PM   #3
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Thanks Bob and that's what I had always understood. I have been using an inline preset regulator and it seems to be set awful low as pressure is pitiful. And it does not state on regulator what pressure it is. So I bought a good adjustable but wasn't sure the max. I have not used it yet.

I have also submitted question to Thor and am sure I won't hear anything until next week. I'll post what I hear from them. Thx, Dennis.
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Old 04-19-2019, 09:56 PM   #4
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I would never do 100 psi.... Asking for trouble IMO. I wonder if it was just a fitting or hose that was saying it was "tested" or "Burst strength" was 100 psi....
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Old 04-19-2019, 10:01 PM   #5
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I wonder that too as it good be that fitting only. If not mistaken there is also a check valve built into some of those inlet to eliminate back flush to the public water system. It may be part of that also. Thx, Dennis.
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Old 04-19-2019, 10:08 PM   #6
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I never go over 45 psi. Came from the boat world. When you were underway or not on the boat you ALWAYS turned off your water pump. It is so ingrained in me that when I am hooked up at a campground and leave the MH I turn off the water.
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Old 04-19-2019, 10:42 PM   #7
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I always used a 50 to 55 psi water pressure regulator.
(To make sure that the Girard tankless hot water system would work as planned.)
Now that I've got a Truma system: I'll check it out at 40 to 45 psi...
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Old 04-19-2019, 11:16 PM   #8
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40 - 80 psi is the usual residential water pressure coming into your house. 100 psi in a motorhome sounds like asking for trouble.
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Old 04-20-2019, 07:22 PM   #9
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I had a problem in my home of water pressure as high as 120. (It ruins hot water heaters and washing machine valves, among other things!) I have it regulated to 80 psi now and that is what the RV would see when on city water at home if I didnít have another regulator at the coach bringing it down to 45. Just because the stickers says 100 psi is the max doesnít mean itís the best. Sort of like tire sidewall pressure limit.
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Old 04-20-2019, 07:56 PM   #10
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Could that warning possibly mean not to exceed 100 psi AIR pressure when blowing out the system for winterizing ? Because when winterizing, all your faucets and toilet flush valve should be open to allow all the water to escape, in which case pressure would not be building up in the plumbing.

I just can't imagine any RV builder suggesting your rig can handle 100 psi of water pressure.
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Old 04-21-2019, 02:35 PM   #11
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Your may be right.... But I would not use 100 psi of air to winterize. I would keep it around 50 to be safe.
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Old 04-21-2019, 02:58 PM   #12
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Quote:
Originally Posted by jannnda View Post
I never go over 45 psi. Came from the boat world. When you were underway or not on the boat you ALWAYS turned off your water pump. It is so ingrained in me that when I am hooked up at a campground and leave the MH I turn off the water.
I agree. I too owned a half dozen big boats before I owned an RV and I always turn off my water pump - even going down the road. You only have to leave it in once in a boat in the middle of the Bahamas with no water in 50 miles and run all your fresh water into the bilge to never forget to turn off the water pump (I never did that!).
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Old 04-21-2019, 03:06 PM   #13
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Originally Posted by Oneilkeys View Post
I agree. I too owned a half dozen big boats before I owned an RV and I always turn off my water pump - even going down the road. You only have to leave it in once in a boat in the middle of the Bahamas with no water in 50 miles and run all your fresh water into the bilge to never forget to turn off the water pump (I never did that!).


Hahaha One time I stopped at the dock of the Bitter End in the BVIís. Took on over 100 gallons of water. Forgot to turn off the water pump. By the time I got to the Bite on Norman Island it was all gone.
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Old 04-21-2019, 03:27 PM   #14
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I looked again thru the owners manual. Finally found this on page 85!!!! I had looked before but apparently didn't see this paragraph. Thx and looks like 55 psi is the max. Thx, Dennis

Some water sources develop high water pressure,
particularly in mountainous regions. These campgrounds
or hookup locations may not have regulated water
pressure, which could be considered excessive. High
pressure is anything over 55 psi. Excessive pressure
may cause leaks or damage to your water system. Water
pressure regulators are available to protect the water
system against high pressures. Check with your dealer
for recommendations of water pressure regulators.
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Old 04-23-2019, 11:48 AM   #15
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Quote:
Originally Posted by bevedfelker View Post
40 - 80 psi is the usual residential water pressure coming into your house. 100 psi in a motorhome sounds like asking for trouble.


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Old 04-27-2019, 07:23 PM   #16
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Water

Hi I stayed at a Koa in Utah and the water pressure was so high that it blew apart my stainless steel preset regulator 55lb at 120. Nothing in the RV blew up so my rig would take 120,but I use an adjustable at 55 now so I can see the pressure on the gauge. That was a year ago and no leaks yet. I check pressure at the camp before hook up along with the electrical .
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Old 04-27-2019, 08:12 PM   #17
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Quote:
Originally Posted by Budman View Post
I searched water pressure threads and couldn't find what I was looking for.

On my Hurricane inside the storage compartment where the water controls are is a plastic piece/plate around the water inlet and it states something like 100 PSI max.

I have never heard of anyone running that high of pressure. Has anyone seen that or tried it? I always understood less around 55-60 max. Next time at the RV I will get a pic of the plate. Thx, Dennis.

My Thor owners manual says "do not exceed 55 PSI". So I keep my max pressure at 50 psi or below. Also, make checking all of your Pex connections a routine task after winter storage and from time to time on the road.


Marshall
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