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Old 06-21-2014, 07:19 PM   #1
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Will Larger Pump Increase Water Pressure?

I have searched the forums but have yet to find the answer to my question. I currently have a 3GPM Shurflo water pump which appears to be working fine. I would like to increase the overall water pressure and wonder if installing a 4.5 GPM water pump would necessarily increase the water pressure. Although it seems logical (to me) that it will, I would love to get some more informed opinions before I make the investment only to find out it doesn't accomplish my goal.
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Old 06-21-2014, 07:29 PM   #2
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I have searched the forums but have yet to find the answer to my question. I currently have a 3GPM Shurflo water pump which appears to be working fine. I would like to increase the overall water pressure and wonder if installing a 4.5 GPM water pump would necessarily increase the water pressure. Although it seems logical (to me) that it will, I would love to get some more informed opinions before I make the investment only to find out it doesn't accomplish my goal.
No. Pumping rate does not equal pressure. Lift equals pressure, so get a pump rated for a higher lift to create a higher pressure.
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Old 06-21-2014, 07:39 PM   #3
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Remember pressure is just a measurement of restriction.
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Old 06-21-2014, 11:41 PM   #4
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No. Pumping rate does not equal pressure. Lift equals pressure, so get a pump rated for a higher lift to create a higher pressure.
Thank you for your input. In reviewing the water pump specs I do not find any reference to "lift", only to GPM or the PSI. Is there an easy way to determine a pumps "lift"? Are you aware of any pumps that may accomplish my goal that would be able to physically fit in the same space? Other than making sure my water lines are unimpeded and that the filter screens are clean, are there any other suggestions to increasing the water pressure?
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Old 06-22-2014, 12:21 AM   #5
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Water pressure is rated in PSI (pounds per square inch). If you can find a pump with a higher PSI output rating than the one you have now, you will have more pressure.

Many Airstream pipe systems are very restrictive. I counted 17 90 degree elbow turns between the pump and the hot water faucet on my 2014 FC 20'. Each of those bends reduces pressure. Flow restrictors to limit water use also lead to apparent low pressure at faucets. They also can be clogged.

What is it you are trying to do? Why do you want to increase the water pressure?
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Old 06-22-2014, 01:25 AM   #6
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Will Larger Pump Increase Water Pressure?

No,,, but yes.

You are probably looking for a better shower?

Max pressure will be achieved with all faucets closed. The pressure will drop some or a lot when a valve is opened and the pump starts up in an attempt to bring the pressure up.

The pump will recover some of the pressure. It will do better at recovery at a low flow, and will do worse and worse as the flow approaches the max flow of the pump.

In practical use flow and pressure work together. Chances are you dont care much about pressure but you want more flow.

Will a higher rated GPM pump give yo more flow? Probably.

How much more depends on some factors. The bends in the pipes, the diameter of the pipes, etc. . But in all likelihood the difference will mostly rest on the flow rating of your fixtures.

There are a lot of variables, but unless your shower head flows very little water you will notice at least a tiny increase in flow with a bigger pump, and you might see a noticeable difference in flow.

Fwiw, my trailer is plumbed in 1/2" PEX, I run a 4.5 pump with a residential shower head and valve, I get a pretty nice shower on the pump... (If your trailer is plumbed in 3/8" tube, a bigger pump isn't really going to make much difference. )

So my short answer to your question is MAYBE.

I haven't studied shower heads much, but if you have a 1 GPM head, the difference will probably be nil to tiny, 2 GPM you would probably notice some difference even though this is below the rating of your current pump.
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Old 06-22-2014, 02:34 AM   #7
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I think the higher flow rated pump will help when you are in the shower and someone else runs water elsewhere. Higher flow rate is fine when using water from a direct input, e.g., a campground, but when boondocking, this can use water quickly decreasing substantially the ability to remain unhooked.

As one who likes to be able to boondock for up to five or six days, I put up with the gentle shower flow.
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Old 06-22-2014, 07:42 AM   #8
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I think you need to find a new shower head that sprays better than the one you have now.
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Old 06-22-2014, 10:03 PM   #9
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Thanks for all your responses - very educational. The shower is fine, probably because I have a new shower head. It's the galley faucet that needs more pressure. I now will probably get a new faucet.
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Old 06-23-2014, 12:10 AM   #10
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Have you cleaned the strainer on the faucet? Do that first.
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Old 06-23-2014, 12:46 AM   #11
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Thanks for all your responses - very educational. The shower is fine, probably because I have a new shower head. It's the galley faucet that needs more pressure. I now will probably get a new faucet.
Today's faucets, and many older ones, have a flow orifice in them, usually a disc with a small hole to restrict flow. Before you replace the faucet, look for a flow restrictor, and possibly some clogged areas like aerators, etc. I have found a flow restrictor where the hose is hooked to the removable faucet, in the head behind the aerators, and at other points of connection (p.o.c.'s)
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Old 06-23-2014, 01:21 AM   #12
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Quote:
Originally Posted by Jfuller678 View Post
Thanks for all your responses - very educational. The shower is fine, probably because I have a new shower head. It's the galley faucet that needs more pressure. I now will probably get a new faucet.
Check the nozzle on the faucet first! You can get a quality head for much less than a whole faucet. Allot of times that is the simplest and cheapest fix.

That said, the faucet in my kitchen at home ended up getting clogged and I spent about two hours with CLR and some pipe cleaners to get it running again after removing it from the counter completly. Even then it still ran poorly and I ended up replacing the faucet anyhow, so I ended up removing and installing it twice.

If you did get some blockage in the faucet itself it will have been something large and it may have clogged other outlets as well, but if only one outlet is restricted then the head of the faucet is the likely culprit, so look easy first.
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Old 06-23-2014, 09:05 AM   #13
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I have not checked the pump on my Airstream but in other rv's I have had, there is a screw on the back of the sureflow pump head which if turned clockwise increases pressure. All this does is turn the pump off at a higher pressure.
The other suggestion I have is to take the heads off fixtures. There is a screen which catches debris. Increase pressure by cleaning the screen.
At higher usage levels a higher gallon per minute pump will increase pressure. If my wife runs the sink when I am showering, I notice the drop in flow.
Pressure fluctuates with a demand sureflow pump. If you install an accumulator tank, you can make the pressure consistent.
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Old 06-23-2014, 09:20 AM   #14
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The plumbing/water lines in my trailer is rated for 60 psi maximum. I normally use a water flow regulator that restricts the flow to 45 psi on my outside water hose coming in to my trailer. I believe that the 45 psi regulator is one that is commonly used. That gives me sufficient water flow, but if I wanted to increase it, VALTERRA makes a high flow regulator that is rated for 55 psi that I could safely use. I also make sure that my whole house water filter does not unduly restrict the water flow coming into my trailer.

I would not use a higher flow regulator than my trailer's water system is rated for.
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