Pressure Pump/Accumulator Tank Systems
What Are Pressure Pump/Accumulator Tank Systems?
If you've ever noticed an annoying pulse in your RV or boat's water flow — faucets that surge and sputter, a shower that fluctuates between hot and cold, or a pump that kicks on and off with every small draw — a pressure pump and accumulator tank system is the solution. These paired components work together to deliver steady, consistent water pressure throughout your freshwater plumbing, whether you're anchored offshore or parked at a remote campsite.
Pressure pump/accumulator tank systems are a cornerstone of any well-designed RV or marine water setup. The pressure pump draws water from your onboard fresh water tank and pressurizes it for delivery to your sinks, shower, and other fixtures. Left alone, a pump controlled only by a pressure switch will cycle on and off rapidly — every time you crack a faucet, the pump fires up. This constant cycling is hard on the pump motor, wastes battery power, and creates that telltale pulsing flow.
How Accumulator Tanks Work
Accumulator tanks solve this problem elegantly. Inside each tank is a pre-pressurized air bladder — essentially an internal balloon. When the pump runs and builds pressure, it compresses this bladder and stores a volume of pressurized water in the tank. When you open a tap, the tank releases that stored water first, satisfying small demand without triggering the pump at all. Only when the bladder pressure drops to the pump's cut-in threshold does the motor need to restart.
The benefits compound quickly:
- Reduced pump cycling means less wear on the motor and a dramatically longer service life.
- Smoother water flow eliminates pulsation at faucets and showers, making hot water temperature far easier to control — especially with on-demand gas water heaters.
- Lower battery drain is critical for boaters and RVers who rely on 12V house batteries while off-grid or at anchor.
- Less noise from the pump motor and from water-hammer shock pressure in the lines.
- Pressure surge protection helps safeguard gaskets, seals, and hose connections from the stress of repeated high-pressure spikes.
Choosing the Right System
When shopping for a pressure pump and accumulator tank system, consider your application's flow rate requirements (measured in gallons per minute), the operating pressure range (typically 30–55 PSI for RV and marine use), and the tank's bladder capacity. Larger boats and Class A motorhomes with multiple fixtures benefit from higher-capacity tanks, while smaller vessels and camper trailers are well served by compact, 1-liter units. Note that accumulator tanks are best suited for use with constant-speed, pressure-switch-controlled pumps — variable-speed "smart" pumps generally do not require or recommend them.
Top Brands in Pressure Pump/Accumulator Tank Systems
Jabsco is the dominant name in marine and RV water pressure systems, with decades of engineering expertise behind their pump and accumulator tank lineup. Their bladder-style accumulator tanks are compatible with their own PAR-MATE pressure pumps as well as many other brands, and feature snap-in port fittings, impact-resistant plastic construction, and compact sizing that works in virtually any installation.
Groco is a long-respected manufacturer of marine plumbing hardware and accessories, known for quality construction and reliability in demanding saltwater and freshwater environments. Their presence in this category reflects their broader commitment to complete onboard water system solutions.
B&B Detailer Products rounds out the category with specialized options for RV and marine plumbing applications, offering targeted solutions for owners looking to upgrade or complete their freshwater pressure systems.