WellMate Tank, 120 Gallon 25"x 75"

The Pentair WellMate WM-35WB is a high-capacity 120-gallon composite pressure tank in a tall wide-body 25" x 75" format, engineered for the most demanding residential and light commercial well systems. With its large reservoir and rust-proof construction, it delivers exceptional drawdown and the kind of long-term durability that steel tanks simply cannot match in moisture-prone environments.

A full 120 gallons of capacity means the WM-35WB stores a large volume of pressurized water, allowing the well pump to run far less frequently even under heavy, simultaneous demand from multiple fixtures or zones. This translates directly into reduced pump wear, lower energy consumption, and smooth, stable pressure throughout the property. For high-use homes and small commercial sites, that extended drawdown is a significant operational advantage that also helps the pump last longer by minimizing short cycling.

Why WellMate

• Large 120-gallon capacity in a 25" x 75" wide-body tank
• Ideal for high-demand homes and light commercial well systems
• Seamless composite shell is completely rust-proof
• Captive-air design minimizes pump cycling and protects the pump
• Resists condensation sweating common to steel tanks
• Engineered and backed by Pentair WellMate

The seamless composite construction is central to WellMate's appeal: it will never rust, eliminating the corrosion that ultimately claims metal tanks in moist environments and gives composite tanks their reputation for longevity. Inside, a durable captive air cell keeps the air charge separated from the water so the tank reliably delivers its full drawdown for years, avoiding the waterlogging that degrades the performance of older steel designs. The smooth composite exterior also stays dry where steel tanks would sweat, protecting the surrounding floor and equipment.

When an installation calls for maximum pressure-tank capacity and uncompromising longevity, the Pentair WellMate WM-35WB stands ready. It is the dependable backbone of a well system designed to handle serious demand while keeping maintenance and operating costs low. As with any pressure tank, set the proper air pre-charge relative to your pump's cut-in pressure during commissioning to ensure the full 120-gallon capacity translates into usable drawdown and trouble-free operation. For the most demanding well systems, few tanks match the combination of capacity, durability, and corrosion resistance that the WM-35WB brings to the job.