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Old 10-21-2020, 12:10 PM   #1
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Water Pressure setting?

We have a on demand water heater on our 2014 390FL, what is the desired water pressure setting?
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Old 10-21-2020, 05:13 PM   #2
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This is the pump you have in the unit. You can adjust the pressure it usually is preset somewhere around 50 55 psi.SHURFLO 4048 WATER PUMP.pdf
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Old 10-22-2020, 09:11 AM   #3
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RV plumbing is typically designed to handle 30psi. I wouldn't think your on demand heater requires anything greater.

The attachment shows the water pump for your unit which indicates, "The pump operates normally up to about 30-psi..."
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Old 10-22-2020, 09:37 AM   #4
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Originally Posted by ceedog View Post
RV plumbing is typically designed to handle 30psi.
What is the source of this information? Can you post a link to it if there is one?

I have never had a problem caused by high water pressure in any RV I have owned.

At my home, the street pressure is 110psi. I have a pressure reducing valve inside set at 75psi for everything inside the house. My water for outside is connected before the PRV, so I have 110psi at all of my outside hose bibs. All of my RVs have been connected to 110psi for extended periods of time — months — with no issues — ever. The only reason I have a PRV on my home system is to reduce the level of noise created in the pipes and at toilet fill valves and solenoid controlled appliances due to the high flow generated by high pressure.

I have never used a PRV at any campgrounds, either. However, if I was concerned enough and decided to use a PRV for my RV, I would set it to somewhere between 55psi and 65psi. Every time your RV’s tank-type water heater (the OP doesn’t have this) heats cold water to make it hot, the pressure in the entire system — both hot and cold sides — is easily going to exceed 65psi, and quite often take it all of the way up to 150psi where the temperature and pressure relief valve on the water heater will begin to weep to keep the pressure at or just below 150psi.

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Old 10-22-2020, 09:44 AM   #5
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Mea culpa. I stand corrected, I use a 30psi PRV on my RV which works fine for me.

Check out the link below:

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Old 10-22-2020, 05:25 PM   #6
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I have had a pressure problem in the past. Specifically at a camp ground where there were only a few of us. The pressure blew out the line to my ice maker (of all things). An easy fix and a now have nice pressure regulator (with gauge) set about 30 PSI.
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Old 10-22-2020, 05:41 PM   #7
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I set mine to 40psi.
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Old 10-23-2020, 12:06 PM   #8
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Personally Id NEVER hook up to CG water without a pressure regulator.....

Have been in CGs that warm campers of their extremely high WP (150psi)

Regulators are too cheap and blown lines way too expensive to not use one...

I have one with gauge that allows me to adjust the amount of pressure Im allowing to enter my hose then my coach.... I leave it hooked to my hose when I store it..,.
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Old 10-23-2020, 12:44 PM   #9
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It has been reported in the forum that Forest River products test the plumbing systems to 100 psi of air pressure. For many years, before manufacturers incorporated air bladders into water supply tanks, single family homes had water pressure set no higher than 45 psi. Higher pressures lead to what is known as water hammer when an open valve was suddenly closed which could cause wear at the joints leading to leaks.
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pressure, water

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