WellMate Tank, 47 Gallon 21" x 41"

The Pentair WellMate WM-14WB is a 47-gallon composite pressure tank with a wide-body 21" x 41" profile, ideal for installations where headroom is tight but solid drawdown capacity is still required. Its squat, low-slung shape fits beneath low ceilings and in crawl spaces while delivering the rust-free reliability the WellMate name is known for, solving a problem that tall tanks simply cannot.

WellMate tanks are constructed from a seamless composite that cannot rust, eliminating the corrosion failures that limit the lifespan of steel pressure tanks. Inside, a flexible captive air cell keeps stored water pressurized so your well pump cycles less frequently. The benefit is meaningful and lasting: reduced pump wear, lower energy consumption, and consistent water pressure throughout the home. Reducing short cycling is one of the most effective ways to extend the life of a well pump.

Wide-Body Design Benefits

• 47-gallon capacity in a low-profile 21" x 41" wide-body tank
• Fits beneath low ceilings, in crawl spaces, and tight mechanical rooms
• Seamless composite shell will never rust or corrode
• Captive-air construction minimizes pump cycling and extends pump life
• Lightweight 51 lb body for manageable installation
• Backed by proven Pentair WellMate engineering

The wide-body format makes the WM-14WB especially valuable in retrofits where a tall tank simply will not fit, such as basements with low joists or compact equipment closets. Despite its shorter stature, it provides a substantial 47-gallon reservoir, smoothing out demand spikes and keeping pressure steady when multiple fixtures draw at once. That combination of generous capacity and compact height is exactly what makes the wide-body line so useful to installers facing real-world space constraints.

The composite exterior also resists the condensation sweating that frequently affects steel tanks in damp basements and utility spaces, helping keep the surrounding area dry and free of moisture damage. Whether you are upgrading an aging tank or specifying equipment for a new well system with limited vertical clearance, the Pentair WellMate WM-14WB combines smart dimensions with rust-proof durability to deliver dependable pressure for years to come. Remember to set the proper air pre-charge before placing it in service for optimal drawdown performance.