Wellmate Pressure Tanks
Get Genuine Wellmate Fiberglass Tanks Online
WM Series
Residential Fiberglass Bladder Type Pressure Tanks
WM Series captive air tanks are the ideal choice for new or replacement installations in residential, light commercial and pressure boosting applications. A captive air tanks purpose is to reserve pressurized water supplied by the pump. A captive air tank will supply its reserved volume of pressurized water until the pressure switch in the system turns the pump back on to take over the demand and supply the captive air tank another recharge. A captive air tanks primary purpose is to protect a pump motor from *short cycling. *Short cycling is the rapid turning on and off the pump. This will overheat the start winding in a single phase motor causing premature motor failure. The volume of water (draw down) a captive air tank holds is important in its selection of the correct size needed to protect the pump from *short cycling. The size required is based on the recharge time needed by the pump to meet the motors minimum run time for proper cooling between cycles. The proper selection of a captive air tank will increase your pumps life.
Low Profile Series are designed for height restricted applications such as mobile homes, crawl spaces and closets.
Features and Benefits
- Corrosion-proof composite construction
- One piece, seamless inner shell molded of premium high-density polyethylene
- Durable blow-molded interior air cell is fully replaceable and constructed of heavy-gauge engineered polymer
- Bottom inlet/outlet assembly is custom molded of high-impact PVC
- Sturdy molded polymeric base is corrosion and impact proof
- Outer shell is a composite of continuous fiberglass strands sealed with high-grade epoxy resin
- Greater drawdown than comparably sized steel tanks – for greater efficiency
- NSF: The entire range of Wellmate Residential Captive Air tanks are listed under ANSI/NSF Standard 61 for water system components.
- Factory Backed Warranty: Five year warranty – from date of installation.
- Light Weight – minimizes labor cost; no need for heavy equipment
Specifications
WM Performance Data
| Model Number | Capacity Gal/Liters |
Maximum Operating Pressure psi/kPa/Bar |
Draw Down 30/50 setting** gal/liters |
Diameter inch/cm |
Overall Height* inch/cm |
Height* inlet outlet to floor inch/cm |
System Connection | Assembly Weight* lb/kg |
| WM-4 | 14.5 | 125 / 862 / 8.6 | 4.4 / 16.5 | 16 / 41 | 26 / 66 | 1-3/4 / 4.4 | 1" male NPT | 14.5 / 6.6 |
| WM-6 | 19.8 | 125 / 862 / 8.6 | 6.1 / 23 | 16 / 41 | 32.5 / 82.5 | 1-3/4 / 4.4 | 1" male MNPT | 20.85 / 9.5 |
| WM-9 | 29.5 | 125 / 862 / 8.6 | 8.9 / 33.5 | 16 / 41 | 44 / 112 | 1-3/4 / 4.4 | 1" male NPT | 24.75 /11.2 |
| WM-12 | 40.3 | 125 / 862 / 8.6 | 12.1 / 45.8 | 16 / 41 | 57 / 145 | 1-3/4 / 4.4 | 1" male NPT | 30 /13.6 |
| WM-14WB | 47.1 | 125 / 862 / 8.6 | 14.1 / 53.5 | 21 / 53 | 41-1/4 / 105 | 2-1/4 / 5.7 | 1-1/4" male NPT | 43 / 19.5 |
| WM-20WB | 60 | 125 / 862 / 8.6 | 18.0 / 68.1 | 24 / 61 | 41-1/2 / 105 | 2-1/4 / 5.7 | 1-1/4" male NPT | 50 /22.7 |
| WM-25WB | 86.7 | 125 / 862 / 8.6 | 26.0 / 98.5 | 24 / 61 | 55-1/4 / 140 | 2-1/4 / 5.7 | 1-1/4" male NPT | 72.75 / 33.0 |
| WM-35WB | 119.7 | 125 / 862 / 8.6 | 35.9 / 135.9 | 24 / 61 | 74-1/4 / 189 | 2-1/4 / 5.7 | 1-1/4" male NPT | 95 / 43.1 |
Low-Profile Performance Data
| Model Number | Capacity Gal/Liters |
Maximum Operating Pressure psi/kPa/Bar |
Draw Down 30/50 setting** gal/liters |
Diameter inch/cm |
Overall Height* inch/cm |
Height* inlet outlet to floor inch/cm |
System Connection | Assembly Weight* lb/kg |
| WM-6LP | 19.3 | 100 / 700 / 7.0 | 5.8 / 21.9 | 24 / 61 | 20-1/4 /51 | 2 1/4 / 5.7 | 1" male NPT | 22.75 / 10.3 |
| WM-10LP | 34.5 | 100 / 700 / 7.0 | 10.4 / 39.2 | 24 / 61 | 28 /71 | 2-1/4 / 5.7 | 1" male NPT | 29.5 / 13.4 |
Note:
Maximum external operating temperature 120°F (49°C).
Maximum internal operating temperature 100°F (38°C).
Minimum operating
temperature 40°F (4°C).
* Diameter, height and weight may vary slightly without notice.
** In keeping with current industry standards,
drawdown factors are based on Boyle's law. Actual drawdowns will
very depending upon system variables, including the accuracy and
operation of the pressure switch and gauge and operating temperature
of the system.
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*No Surprise Pricing. The Price You See Is All You'll Pay
*Shipping Exceptions: AK & HI Not Included. (click FREE SHIPPING Icon for details >) Sales Tax Exception: Add sales tax for Florida ship to addresses only! If picked up here - sales tax is included because there will be no shipping. |
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"You may find it somewhere else for less but less always requires a sacrifice"
WM Series Tank Data and Prices
All tanks in stock for immediate shipping
Pressure Tank Sizing Calculator| Model | Capacity Gallons |
Water Storage **30/50 setting Gallons |
Ship Weight lbs. |
Part Number |
Shopping Cart View Cart |
| WM-4 | 15 | 4.4 | 19 | CH30837 |
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| WM-6 | 20 | 5.9 | 23 | CH30840 |
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| WM-9 | 30 | 8.9 | 30 | CH30854 |
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| WM-12 | 40 | 12.1 | 35 | CH30866 |
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| WM-14WB | 47 | 14.1 | 48 | CH30951 |
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| WM-20WB | 60 | 18 | 55 | CH31050 |
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| WM-25WB | 87 | 26 | 78 | CH31056 |
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WM-35WB |
119 |
35.9 |
101 |
CH31062 |
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*Larger Wellmate tanks must be shipped by freight because of their size. NOTE: Residential delivery has just been added as a Free shipping feature. Other freight charges may be added by the carrier if determined and will be collected at the time of delivery. Questions concerning additional delivery cost can be answered by phone at 1-866-960-9621.
WM Series Low-Profile Tank Data and Prices
| Model | Capacity Gallons |
Water Storage **30/50 setting Gallons |
Ship Weight lbs. |
Part Number |
Shopping Cart View Cart |
| WM-6LP | 19.3 | 5.8 | 28 | CH31850 |
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| WM-10LP | 34.5 | 10.4 | 35 | CH31957 |
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Don't Forget the Tank "T" Kit
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Pictures shown unassembled and assembled for both sizes
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1" Tank "T" Kit
use with
FREE Shipping |
1-1/4" Tank "T" Kit
use with
FREE Shipping |
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Just need a pressure switch?
Square D Pressure Switch Wiring Diagram
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30/50 PSI Model |
40/60 PSI Model |
40/60 PSI Low Pressure Cut Out Model (Similar to picture but with manual reset lever) |
Need a Replacement Air Cell Kit ?
Air Cell Installation Manual|
WM-25WB
87 Gallon Air Cell Kit $269 FREE Shipping |
WM-35WB
119 Gallon Air Cell Kit $439 FREE Shipping |
| WM Air Cell Installation Manuals | Product Literature | Replacement Parts |
| Tech Guides | Pressure Tank Sizing Calculator | FAQ's |
Want an alternative to your high cost for a large captive air tank?
Stop short cycling, get steady water pressure and reduce tank
size on your present pump system using a Cycle Stop Valve.
What are Cycle Stop Valves?
Got More Questions? Get them answered at
Cycle Stop Valve - Web Site
Use Our 50PSI Cycle Stop Constant Pressure Valve Kit Complete With WM-6 20 Gallon Tank
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Kit Includes
NOTE; A Cycle Stop Valve or CSV is a simple device that drastically reduces the number of times a pump is cycled on and off. The Cycle Stop Valve can be used with very small pressure tanks and still double or triple the life of any pump or motor. The CSV controls the amount of water being pumped to exactly match the amount of water being used. This means the CSV can be used with very small pressure tanks because there is no extra water being pumped to cause the tank to fill. Pumping more water than is being used is what causes the pump to cycle on and off repeatedly. Cycling on and off repeatedly causes the pump, motor, controls, and bladder pressure tank to wear out prematurely. |
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Just Want The Cycle Stop Valve ?
 Fixed Cycle Stop Valve Enlarged |
Fixed Cycle Stop Valve Enlarged |
Fixed Cycle Stop Valve Enlarged |
 Adjustable Cycle Stop Valve Enlarged |
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1" FNPT Valve |
1" FNPT Valve |
1" FNPT Valve |
1" FNPT / 1-1/4" MNPT Valve (Adjustable 15-150PSI) |
Please Note: FREE shipping is to the lower US 48 States on all pumps. There is Sales Tax that applies only to Florida residents without a resale certificate. See Shipping Details
Please call 1-866-960-9621 for all other pumps.