6 Best RV Water Pressure Tanks For Steady Flow
Achieve consistent water flow in your rig with our top six RV pressure tank picks. Learn how these essential upgrades prevent pump cycling and save your system.
Nothing ruins a quiet morning in the backcountry faster than a water pump that stutters, cycles incessantly, and makes your faucet sound like a rhythmic jackhammer. Adding an accumulator tank to your RV plumbing system is the single most effective way to smooth out that flow and extend the life of your pump. Here are the best options to ensure your mobile water system runs as quietly and consistently as a residential home.
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Seaflo 1-Gallon Accumulator: Best Overall Flow
The Seaflo 1-gallon model is the gold standard for those who have the cabinet space and want the most consistent pressure possible. By holding a larger volume of pressurized water, it significantly reduces the "on-off" cycling of your pump, which saves battery power and reduces mechanical wear.
If you frequently boondock and want to avoid that annoying pump chatter every time you wash your hands, this is your best bet. It is robust, easy to plumb into standard half-inch fittings, and provides a noticeable cushion for your system. If you have the room under your sink, stop looking—this is the tank you want.
SHURflo 182-200 Pre-Pressurized Tank Choice
SHURflo has long been a household name in the RV industry, and their 182-200 model remains a reliable, mid-sized workhorse. It is designed specifically to work in harmony with their line of water pumps, making it a "plug-and-play" upgrade for many existing rigs.
This tank offers a great balance between size and performance, fitting into tighter spots than the 1-gallon models while still providing enough air-cushioning to stop system pulsation. If your current pump is a SHURflo model, sticking with the same brand ensures compatibility and simplifies your installation process. It is a solid, no-nonsense choice for the average traveler.
Jabsco 30573-0000 Accumulator Tank Reliability
Jabsco is known for engineering equipment that stands up to the rigors of marine and mobile environments, and their 30573-0000 tank is no exception. This unit is exceptionally well-built, featuring a high-quality internal bladder that resists common failures found in cheaper alternatives.
I recommend this tank for those who prioritize longevity and "install-it-and-forget-it" performance. While it may carry a slightly higher price tag, the peace of mind you get from knowing your plumbing won’t develop a slow leak behind a cabinet wall is worth the investment. It is the ideal choice for full-time nomads who cannot afford downtime.
Eco-Flow 0.75L Tank for Compact RV Spaces
Van conversions and teardrop trailers often lack the luxury of extra plumbing space, which is where the Eco-Flow 0.75L tank shines. It is tiny, unobtrusive, and fits into the tightest corners where a larger tank simply wouldn’t survive the install.
While you won’t get the same volume of buffer as a 1-gallon tank, it is more than enough to stop the "water hammer" effect in a small system. If your primary goal is to silence a loud pump and stop the rapid cycling in a compact build, this is the most space-efficient solution on the market.
Flojet 30558-0000 Tank for Steady Pressure
The Flojet 30558-0000 is a classic design that has been helping RVers achieve steady water flow for years. It is particularly effective at smoothing out flow in systems that utilize high-output pumps, which can sometimes be prone to erratic pressure changes.
This tank is straightforward to mount and features a reliable pre-charge valve that makes seasonal maintenance a breeze. If you are looking for a mid-range, proven solution that bridges the gap between the ultra-compact tanks and the massive 1-gallon units, the Flojet is a dependable middle-ground.
Amarine Made 0.75L Tank for Budget Builds
If you are working on a tight budget or setting up a secondary water system for an outdoor kitchen, the Amarine Made 0.75L tank is an excellent value. It provides the essential benefits of an accumulator without the premium pricing of the major name brands.
While the build quality is slightly more utilitarian, it gets the job done perfectly well for occasional weekend trips. It is a great way to test the benefits of an accumulator system without committing to a high-end investment. It’s a functional, honest piece of gear for the cost-conscious builder.
Understanding RV Water Pressure Dynamics
RV water systems are inherently different from residential ones because they rely on demand-based pumps rather than constant municipal pressure. When you open a faucet, the pump kicks on; when you close it, the pump builds pressure until it hits a cut-off switch.
Without an accumulator, this cycle happens instantly, leading to "pulsing" water flow. An accumulator tank adds a pressurized air chamber to the line, acting as a spring. It absorbs the pump’s surge and provides a steady, pressurized flow even when the pump isn’t running, which makes for a much smoother experience at the tap.
Proper Installation for Accumulator Tanks
Installation is straightforward, but the location matters significantly. Ideally, you want to install the accumulator as close to the pump as possible, on the output side, before the water lines branch off to your various faucets.
- Secure Mounting: Ensure the tank is screwed down firmly to prevent vibration-induced leaks.
- Access: Leave enough room to reach the air valve (like a tire stem) for future pressure adjustments.
- Fittings: Use high-quality PEX or reinforced braided hose to avoid leaks at the connection points.
Maintaining Consistent Water Pump Performance
An accumulator tank is not a "set it and forget it" device for eternity. Over time, the internal air pressure can fluctuate, which can lead to the tank becoming waterlogged and ineffective.
Once or twice a year, check the air pressure in the tank using a standard tire gauge. Most tanks should be set to a pressure slightly lower than your pump’s cut-in pressure. Keeping this air cushion properly maintained is the secret to extending the life of your water pump by years.
Troubleshooting Common RV Water System Issues
If your pump is still cycling even with a tank installed, you likely have a leak or a failing check valve. A small leak in a faucet or toilet seal will cause the pump to lose pressure slowly, leading to "ghost cycling" where the pump clicks on for a second while you are sleeping.
If you hear the pump cycling when no water is being used, start by checking all your connections for dampness. If the system is dry, the internal check valve in the pump is likely the culprit. Addressing these small issues early prevents the pump from burning out prematurely.
Adding an accumulator tank is one of the highest-value upgrades you can make to your RV’s plumbing system. By smoothing out the pressure and reducing mechanical stress, you gain a quieter, more reliable water supply that feels just a little more like home. Choose the size that fits your space, keep the air pressure topped off, and enjoy the steady flow on your next adventure.
Frequently Asked Questions (FAQs)
What is an RV water pressure tank?
An RV water pressure tank, often called an accumulator tank, is a small pressurized vessel with an internal rubber bladder that stores water under pressure. The bladder separates pressurized air from the water supply to cushion water surges and reduce pump cycling. When you open a faucet, the pressurized air pushes water through the lines before the 12-volt pump needs to engage. This device keeps water flowing smoothly and extends the operating life of your onboard water pump.
What does an accumulator tank do in an RV plumbing system?
Accumulator tanks eliminate pipe chatter and pump cycling by buffering pressure spikes whenever an RV faucet or shower is opened slightly. Without a tank, opening a valve at low flow causes the pressure switch to turn the 12-volt pump on and off several times per second. The tank holds a reserve volume, typically between 24 ounces and 2 gallons, allowing steady low-flow delivery without triggering the pump motor. This process protects plumbing joints from vibration leaks.
How do I install an RV water pressure tank on an existing pump?
Installing an RV water pressure tank requires mounting the unit on the discharge side of your water pump using flexible braided tubing and threaded fittings. Turn off the pump switch, disconnect RV shore power, and open a faucet to drain all remaining line pressure. Splice into the cold line between the pump outlet and the check valve using half-inch barb or quick-connect fittings. Secure the tank to a solid floor or wall stud with mounting screws to prevent travel vibration.
How do you set the air pressure in an RV water pressure tank?
Setting the air pre-charge in an RV water pressure tank requires calibrating the bladder to two to three PSI below the water pump cut-in pressure. Shut off the pump and open faucets to relieve all line pressure before checking the Schrader valve. Use a standard tire gauge to read pressure, then adjust using a manual bicycle pump. If your pump turns on at 30 PSI, adjust the empty tank pressure to 27 or 28 PSI.
Is a 2-gallon RV water pressure tank better than a small 24-ounce tank for boondocking?
A two-gallon RV water pressure tank is superior for boondocking because it provides a larger water cushion, drastically reducing battery draw from frequent pump starts. Compact 24-ounce tanks smooth out flow and stop rapid hammering, but the pump still kicks on after dispensing just a cup or two of liquid. A larger two-gallon unit holds enough pressurized volume to wash hands or flush the toilet at night without waking anyone or drawing battery power. Choose compact tanks only when space is limited.
How much does an RV water pressure tank cost to buy and install?
RV water pressure tanks cost between $35 and $120 for the hardware, depending on capacity and build materials. Compact 24-ounce nylon models from brands like Seaflo or Shurflo sell between $35 and $55, while heavy-duty two-gallon steel tanks cost $70 to $120. Doing the installation yourself requires about $10 to $20 in PEX fittings, clamps, and flexible hose. Hiring an RV technician to complete the job typically adds one hour of labor, ranging from $100 to $180.
Why is my RV water pressure tank pulsing rapidly when the faucet is running?
Rapid water pulsing usually indicates that the RV water pressure tank has lost its internal air charge or suffered a ruptured bladder. When the air cushion escapes, the tank becomes waterlogged, leaving no compressible air volume to absorb pump cycles. Depress the stem inside the tank Schrader valve with your fingernail to check for issues; if water squirts out, the internal rubber diaphragm has failed and the tank must be replaced. If nothing comes out, pump the tank back up.
Is an RV water pressure tank worth it if you mostly stay at full hookup campgrounds?
Campers who rely strictly on city water hookups generally do not need an RV water pressure tank because city water bypasses the onboard 12-volt pump entirely. City water relies on campground supply pressure, so the accumulator bladder cannot smooth out dockside fluctuations. However, the tank remains valuable if you frequently travel between destinations, use rest-stop bathrooms, or stay at parks with weak shore pressure where running the fresh tank pump is necessary. For off-grid use, the modest cost is well justified.
