Groco Accumulator Tanks
Groco PST Series Accumulator Tanks: Steady Pressure on the Water
When it comes to reliable onboard water pressure, few names carry more weight than Groco. Founded in 1918 on the principles of innovative design and sound construction, Groco has spent over a century engineering marine plumbing solutions that hold up in the harshest saltwater environments. Their accumulator tanks are a natural extension of that legacy — purpose-built to solve one of the most common frustrations aboard any pressurized freshwater vessel.
What the Groco PST Series Does
Groco's accumulator tanks fall under the PST (Pressure Storage Tank) Series. Groco PST Series pressure storage tanks provide smooth water pressure delivery, even temperature mix in showers, and reduced pump cycling. The engineering behind this is straightforward but effective: a pneumatic pressure charge matched to the pump cut-on pressure prevents water logging by separating the air charge from system water pressure with a rubber bladder. The result is a system that maintains pressure in the line even when the pump is momentarily off, eliminating the rapid on/off cycling that wears out motors and pressure switches prematurely.
Choosing the largest PST tank that will fit into the available space is recommended, as larger tanks reduce pump cycling and will prolong motor and pressure switch life. For maximum efficiency and water delivery, the accumulator tank pressure charge should be the same as the pump switch turn-on setting, typically 20 PSI.
PST Series Size Range
Groco offers the PST Series across a wide range of drawdown capacities to suit everything from compact day boats to large cruising yachts. Options span from a compact 0.5-gallon drawdown model (PST-1) all the way up to tanks with a 6.3-gallon drawdown and 20-gallon total volume, rated to a maximum working pressure of 100 PSI. Mid-range models like the PST-2 (1.4-gallon drawdown) and PST-3A (3-gallon drawdown) cover the most common liveaboard and cruising use cases. Larger stand-mounted variants are designed to integrate directly with Groco's own pump lines, including the PJR, WSC-60, and WSC-80 series.
Built for the Marine Environment
Groco products are designed and manufactured with the most durable materials available for resistance to the corrosive and electrolytic effects of saltwater application. This commitment to material quality is consistent across the entire Groco lineup — the company is known for producing high-quality fittings made from bronze and stainless steel — and the PST Series tanks reflect the same uncompromising standard. Based in Stevensville, Maryland, Groco remains a family-owned business dedicated to American manufacturing, providing durability and reliability in the challenging marine environment.
A Trusted Name in Marine Plumbing
Established in 1918 and now a third-generation U.S. manufacturer, Groco marine products are widely regarded for their superior construction and cutting-edge features. Whether you're outfitting a new build or upgrading an aging freshwater system, the Groco PST Series accumulator tank is a proven solution backed by a manufacturer with more than a century of marine expertise. Explore the full range of accumulator tanks or browse the complete Groco catalog to find the right components for your vessel.