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Old 11-28-2013, 09:07 AM   #1
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pump configuration for optimal pressure on city water

Ive been living in a 26' fleetwood toyhauler while my wife and I restore our 72 32' Streamline for full timing. My experience has been that the water pressure at RV parks can be quite dismal, and since I have the pleasure being able to design my own fresh water system, I was wondering if anyone has come across a method of plumbing that might use the on board pump to boost flow so that there is always good pressure (60-70PSI desired)? We nixed the old pressurization style tank in favor of a new poly 28.5 gallon tank, have all new residential-style fixtures, new tankless propane WH, and have not purchased a pump yet. I am plumbing everything in pex, if that matters. Anyone have any Ideas?
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Old 02-17-2014, 09:55 PM   #2
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Good luck.

Replumbing my my 73 Sovereign and haven't found any info yet. Will get back to you if I find anything out. I wanted to do the same thing as you though, use the water pump along with external water. I am also using pex line. I have ordered service manual which should come in 2 weeks with stock diagram and will modify as needed. Another resource I will be exploring is the local RV service/parts dept. mine have been very helpful up to this point. Perhaps it's because I spent $700 last time i was there on parts?
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Old 02-18-2014, 01:07 AM   #3
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Well, you could simply plumb the pump into with a check valve, and when demand exceeds shore water pressure /flow , the pump would draw from the fresh water tank to supplement the demand.

The tank could be topped off later.

This may be the real answer, because the park may not be lacking pressure so much as it lacks flow, and non existent flow can't really be "boosted" more than just very marginally.
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Old 02-18-2014, 01:11 AM   #4
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Of course this configuration would require a second check valve to prevent the fresh water tank from being emptied to satisfy your neighbors in the park....
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Old 02-18-2014, 02:17 AM   #5
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Seems like a lot of effort for small gains. If city water pressure is dismal, just don't use it. Fill the onboard freshwater tank, and use your onboard pump to provide pressure. City pressure doesn't have to be much to fill the tank; it just takes longer. But you're not using water 24/7 anyway, so if it takes an extra minute or two to fill the tank, so what?
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Old 02-18-2014, 02:58 AM   #6
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pump configuration for optimal pressure on city water

It just so happens I set my water system up the way I mentioned above, but not for the same reason..... But for simplicity of design.

When I started thinking about the question, I realized my setup would work as I described.

The problem of low pressure in a park is going to be manifest in low flow. When I thought of this it occurred to me that putting the pump in line as a booster wouldn't solve the problem. (Pumps don't pull suction well and even if they did a strong suction would just collapse the feeder hose)

While my solution above does draw on the tank, it would under some conditions draw slower than if all of the water were taken from the tank so longer showers might be possible.

I like long showers!

There are A LOT of variables here though. For example, a 1" line at 20 psi will flow more water than a 3/8 line at 90 psi...... Add to the equation bottle necks, low flow shower heads, pressure differentials, flow differentials, wow, lots and lots of variables.
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