Low Water Pressure
Low Water Pressure in an RV
Low water pressure can come from the campground, the hose, the regulator, the filter, the city-water inlet, the pump, or the fixture itself.
That is why I like to separate city-water problems from RV plumbing problems early.
The easiest test is often comparing campground city water against the RV pump.
Common Signs
- Weak shower flow
- Tankless water heater temperature swings
- Slow sink flow
- Toilet fills slowly
- Pressure better on pump than city water
- Pressure better at one campground than another
- Pressure drops after adding a filter or regulator
City Water Versus Pump Test
If pressure is weak on city water but stronger on the RV pump, the RV plumbing may be fine.
The issue may be campground pressure, a restrictive regulator, a clogged filter, a kinked hose, or the city-water inlet screen.
I noticed this with tankless hot water too. Switching to the pump can sometimes give steadier flow.
Pressure Regulators
Some inexpensive inline RV water pressure regulators can restrict flow more than owners expect.
They may protect the plumbing but still reduce flow enough to affect showers and tankless water heaters.
An adjustable regulator with a gauge is easier to understand because you can see what is happening.
Use teflon tape if you see water dripping.
Filters and Screens
Water filters can clog slowly. Inlet screens can catch debris. Shower heads and faucet aerators can also restrict flow.
If pressure changed after installing a filter, replacing a hose, or moving campgrounds, I would start there.
Simple restrictions are common.
Campground Pressure Changes
Campground pressure can change during the day. Morning and evening water use may reduce flow when many RVs are showering or washing dishes.
That can make the problem seem random.
If the pressure improves late at night, the campground system may be part of the issue.
Pump-Related Low Pressure
If pressure is weak on the pump too, then I would look inside the RV system.
Possible causes include low fresh water, air in the lines, a pump strainer restriction, weak pump performance, or a partially closed valve.
When To Stop
If low pressure is paired with leaking, pump cycling, water inside cabinets, or strange noises, inspect carefully before continuing.
Leaks and restrictions can hide behind panels or under fixtures.
Recommended Products
These are common items RV owners may use when checking water pressure problems.