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Old 09-06-2010, 10:55 AM   #1
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Water Hose

I have been bothered (as I am guessing many others as well) with low water pressure in the kitchen and shower. I switched to an Oxygenics shower head which helped a lot and removed the restricter from the kitchen faucet (which did nothing).


My question is that I currently have a 1/2" water hose. Would a 5/8" hose make any difference or would I just be wasting money?
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Old 09-06-2010, 11:04 AM   #2
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What are you using for a regulator outside the motorhome?
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Old 09-06-2010, 11:07 AM   #3
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Standard, pre-set brass regulator. Was thinking of getting an adjustable regulator also.
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Old 09-06-2010, 11:11 AM   #4
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I am trying to find you the link I used to fix this common problem.

In a nutshell, I made a home made manifold that has two of those standard brass hose regulators in it. In parallel of course. Double the flow volume but still the same pressure regulation. Some guys even run three. Tested, these home made regulators beat out some of the most expensive whole house regulators bought at the home stores in this article that I read, but cannot find lol.

I was amazed at the difference. Only downside is now the gray tank will fill up super fast if you take full showers.

I get a few people that will walk up and ask me what the heck that is hooked to our camper.
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1999 Ford Superduty F250 PSD CC SB 6spd 4x4.
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2006 Sierra F28 Rear Kitchen 5th Wheel, 31' = 10k pounds.
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Old 09-06-2010, 11:18 AM   #5
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tmmar check this link out. Like I said, it worked for us.

Water Pressure Regulators for an RV

Forgot to mention this is also flowing though a Dupont whole house filter which also has an affect on flow rate. This is also through 1/2" hose I believe. As to your original question, I don't know if you would notice a difference going to 5/8s or not.
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Old 09-06-2010, 11:31 AM   #6
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Steve,
As I understand it, you have a single feed going into a manifold that has 2 regulators in parallel and back into a single feed to the camper. Is this correct? If so, I don't see how this would increase the pressure in the coach. Maybe I am incorrect with my assumption. If you have a diagram or picture of the setup, that would be helpful.
Thanks,
Tom
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Old 09-06-2010, 11:35 AM   #7
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You are correct. Single in from the source to a, Y manifold, to 2 marshall brass regulators, Y maniflold back to 1 and into the camper.

Let me ask you this, do you have a pressure problem or a flow problem? There is a big difference. I run multiple pressure gauges in our camper, one before the filter and one after. The regulators keep a running pressure of about 45 PSI. You aren't going to get anymore pressure.

I am pretty sure what you are saying is that your are lacking flow?
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1999 Ford Superduty F250 PSD CC SB 6spd 4x4.
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Old 09-06-2010, 11:51 AM   #8
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Steve,
Don't pressure and flow rate go hand in hand? Wouldn't higher pressure produce a greater flow?
Tom
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Old 09-06-2010, 12:02 PM   #9
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Yes Tom, but you are regulating your pressure to no more than 50 PSI. To protect your plumbing of course. So if you are at 50 PSI in the camper that is all you get.

Hypothetically speaking you could put 200 psi at the hose bib and if your regulator is doing it's job you would still be complaining of a lack of flow in the camper.

So, your objective is to find the restrictions in the system and open them up to improve flow. Gallons Per Minute. The biggest restriction is pressure regulators. When you add a bigger diameter regulator and or two smaller ones you just added more flow.

Take a cup of water and try drinking it through a straw. Then take two straws and take a drink. You will notice a difference in flow. but you applied the same amount of suction to the straws.

The bottom line is, you shouldn't have any control of pressure unless you choose not to run a regulator. Bad idea, ask me how I know lol. Or your water source has a pressure problem and you are saying you only have like 20 psi of pressure.

Hope I am not confusing you as it is hard for me to describe this kind of stuff in words.
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1999 Ford Superduty F250 PSD CC SB 6spd 4x4.
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2006 Sierra F28 Rear Kitchen 5th Wheel, 31' = 10k pounds.
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Old 09-06-2010, 12:10 PM   #10
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Steve,
No- not confusing at all. I will definitely get the parts needed to build a manifold and give it a try.
Thanks for the info.
Tom
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