Wellmate Captive Air Tanks
WM Series
Fiberglass-Bladder Type-Captive Air 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 drawdown 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 | |
| WM-6 | 20 | 5.9 | 23 | CH30840 | |
| WM-9 | 30 | 8.9 | 30 | CH30854 | |
| WM-12 | 40 | 12.1 | 35 | CH30866 | |
| WM-14WB | 47 | 14.1 | 48 | CH30951 | |
| WM-20WB | 60 | 18 | 55 | CH31050 | |
| WM-25WB | 87 | 26 | 78 | CH31056 | |
|
WM-35WB |
119 |
35.9 |
101 |
CH31062 |
* The Wellmate WM-35WB 119 gallon tank must be shipped by freight because of its size.
NOTE: Remote location deliveries, construction sites, country clubs, hydraulic lift service and etc. may be added by freight carrier and collected on delivery. Call 1-866-960-9621 so we can check with carrier if you are unsure.
WM Series Low-Profile Tank Data and Prices
| Model | Capacity Gallons |
Water Storage **30/50 setting Gallons |
Ship Weight lbs. |
Part Number |
Shipping/ Handling |
Shopping Cart View Cart |
| WM-6LP | 19.3 | 5.8 | 28 | CH31850 | FREE | |
| WM-10LP |
34.5 | 10.4 | 35 | CH31957 | FREE |