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Old 01-01-2020, 10:26 AM   #1
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Cold water pressure low when hooked to city water connection

I am having a water pressure issue with the cold water line. The hot water is fine but the cold water pressure is low in all sinks and shower. Water filter is brand new and I also tried bypassing the filter. Any ideas what is causing this?? Thank you in advance!
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Old 01-01-2020, 10:38 AM   #2
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Since you seem to have good hot water pressure, one must assume that the water supply pressure is OK and the pressure at the cold water inlet to the water heater is fine.

So the problem has to be in the main cold water line AFTER it branches away from supplying the water heater. It must have developed a kink or restriction of some sort in the line, but only in the area between the water heater inlet and wherever it splits to supply the different cold water fixtures.
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Old 01-01-2020, 10:44 AM   #3
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Since you seem to have good hot water pressure, one must assume that the water supply pressure is OK and the pressure at the cold water inlet to the water heater is fine.

So the problem has to be in the main cold water line AFTER it branches away from supplying the water heater. It must have developed a kink or restriction of some sort in the line, but only in the area between the water heater inlet and wherever it splits to supply the different cold water fixtures.


Thank you for your help! I will check this out. Happy New year to you!
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Old 01-01-2020, 08:33 PM   #4
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Also check if all 3 of your bypass valves are set for normal use.
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Old 01-02-2020, 09:19 AM   #5
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I agree with SlowRide, the restriction has to be after the feed to the water heater. And it has to be before the first tap.
When you first open a tap does the water seem to start out fast for a few seconds and then slow down?
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Old 01-02-2020, 10:00 AM   #6
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Have you recently drained the Water Heater via the low point drains?
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Old 01-02-2020, 11:14 AM   #7
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I agree with SlowRide, the restriction has to be after the feed to the water heater. And it has to be before the first tap.
When you first open a tap does the water seem to start out fast for a few seconds and then slow down?


Hi Bama! Thank you for your response! The valves are in the correct position..
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Old 01-02-2020, 11:15 AM   #8
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Have you recently drained the Water Heater via the low point drains?


Hi Flybob! I will do this today! Thank you!
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Old 01-02-2020, 11:23 AM   #9
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Hi Flybob! I will do this today! Thank you!
Flybob was not making a suggestion for a fix. He was doing diagnostics to see if draining the water heater through low point drains sucked junk out of the heater into the cold water line.
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Old 01-02-2020, 11:37 AM   #10
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Hi Flybob! I will do this today! Thank you!
I was not recommending this. This will sometimes will draw crud from the bottom of the WH into the cold water lines after the WH and cause the issue you are seeing.
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Old 01-02-2020, 11:38 AM   #11
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I was not recommending this. This will sometimes will draw crud from the bottom of the WH into the cold water lines after the WH and cause the issue you are seeing.


Okay. So the answer is no I have not drained via the low point recently. Thank you for the clarification
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Old 01-02-2020, 12:13 PM   #12
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Here is a BASIC schematic of the plumbing system in a R/V.

Since your pressure issue seems to be on the cold side only, it might give you an idea what folks are referring to when mentioning the restriction must be beyond the feed to the water heater.

In the case of the photo... you would only be concerned with the lower right side of the schematic.
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Old 01-02-2020, 04:01 PM   #13
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First of all, this is not a pressure issue. The pressure is the same everywhere (when no water is flowing). This is a FLOW issue.

Second, not sure about your trailer, but on ours cold water flows from the city water inlet to the lavatory sink (right behind the inlet), then to the shower, then to the toilet, then to the water heater, and finally to the kitchen sink.

For the symptoms you describe, the water flow would have to be from the city water inlet to the water heater first, and everything else afterwards. Is that consistent with the layout of your trailer?
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Old 01-03-2020, 02:48 PM   #14
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Here is a BASIC schematic of the plumbing system in a R/V.

Since your pressure issue seems to be on the cold side only, it might give you an idea what folks are referring to when mentioning the restriction must be beyond the feed to the water heater.

In the case of the photo... you would only be concerned with the lower right side of the schematic.


Thank you so much!
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Old 01-03-2020, 02:50 PM   #15
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First of all, this is not a pressure issue. The pressure is the same everywhere (when no water is flowing). This is a FLOW issue.

Second, not sure about your trailer, but on ours cold water flows from the city water inlet to the lavatory sink (right behind the inlet), then to the shower, then to the toilet, then to the water heater, and finally to the kitchen sink.

For the symptoms you describe, the water flow would have to be from the city water inlet to the water heater first, and everything else afterwards. Is that consistent with the layout of your trailer?


Hi, the pressure is the same on the cold water if the city water connection is used or the pump on board..
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Old 01-04-2020, 09:33 AM   #16
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Does your toilet have low water pressure also ? I had a semeler issue with my water pressure. Finally found it when I took the water line to my toilet off and found a filter screen between the toilet and the line full of debris . Cleaned it out and water pressure was fine . Couldnít believe myself that was the problem. But it worked. Might be worth a try. Canít hurt .
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Old 01-04-2020, 09:37 AM   #17
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There should also be a screen at the hose hook up .check it also .
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Old 01-04-2020, 10:08 AM   #18
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There should also be a screen at the hose hook up .check it also .
A clogged screen at the input would not cause problems with cold only. OP wrote "water pressure issue with the cold water line. The hot water is fine...."
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Old 01-04-2020, 10:09 AM   #19
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Does your toilet have low water pressure also ? I had a semeler issue with my water pressure. Finally found it when I took the water line to my toilet off and found a filter screen between the toilet and the line full of debris . Cleaned it out and water pressure was fine . Couldnít believe myself that was the problem. But it worked. Might be worth a try. Canít hurt .
A clogged toilet valve could not cause flow issues with all the other cold water outlets.
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