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Wellmate Fiberglass Pressure Tanks

WellMate's tanks feature corrosion-proof composite construction that require little or no maintenance, plus their light weight makes them easier and less costly to install. All materials meet stringent U.S. Requirements for water components and are NSF and/or FDA listed materials. WellMate continues its tradition of excellence by offering features and benefits steel tanks cannot match.

These rustproof WellMate pressure tanks are made with blow molded, fiberglass wrapped, seamless construction. They won't rust, dent, or come apart at the seams because there are no seams, and a rugged base is included. Full five-year limited warranty.

These tank now features the quick connect that snaps securely into place and is retained by an H-clip.  

Wellmate Fiberglass Pressure Tanks

How to Size a Pressure Tank

Not interested in doing all the math below? Enter your values here to calculate.


Enter your pump output, desired runtime, and pressure switch settings to find the proper size tank.


Pump Output in GPM

Desired Runtime *

Pressure Switch Cut In PSI

Pressure Switch Cut Out PSI

* Recommended Minimum Runtime:
Up to 3/4 HP - 1 Minute
1 to 2 HP - 2 Minutes
2 HP and up - 3 Minutes


Since its inception in 1964, the pre-pressurized potable water tank has assumed various designs and has proven useful in a wide variety of open-system applications. Originally used in well installations, this technology gained widespread acceptance and was soon applied in a variety of applications requiring pressurized water storage. With this flexibility, however, can come confusion as to installation scenarios and related sizing. Below, we 'll take a look at proper use and related sizing techniques in such applications as pump cycle control, volume maintenance, and water treatment systems.

Common to the below examples is the fact that it is necessary to determine both the amount of tank storage needed and the pressures necessary to obtain that storage. Simply stated: All sizings use the same principle with different values. Referred to as Boyle's Law of Ideal Gases, this principle will be used to determine how much water is stored in tank at a given pressure. This multiplier will be referred to as the Acceptance Factor. Keep this equation in mind as a foundation to size any pre-pressurized tank:

Pump Systems

It is common knowledge in the water systems industry that cycling a pump motor rapidly will often lead to failure. To prevent this, most pump manufacturers normally recommend a minimum pump runtime of 2 minutes. In order to achieve the runtime, the pre-pressurized tank must store a given volume of water between pump cycles. Doing so requires the pump to run for a specific period to fill the tank. In general, larger pumps require longer intervals between start cycles. When sizing a pre-pressurized tank for the above purpose, the following information should be known: Pump horsepower, pump output in gallons per minute (GPM), and pressure switch setting in psi (cut-in & cut-out). The below procedure will guide you through a sizing scenario using a 1hp pump. The pump will be operating at 15 GPM with a pressure switch setting of 40psi cut-in and 60psi cut-out. The Acceptance Factors have already been calculated in the chart provided. The figures are based on a tank precharge (initial air charge) set 2psi below pump cut-in pressure.

According to the "Recommended Minimum Runtime" notation, a 1hp pump should operate for a period of at least 2 minutes between motor starts. In order to run a 15GPM pump for 2 minutes, 30 gallons of storage is necessary. The Acceptance Factor indicates that 27% of a given tank's volume will be usable water between 40 and 60psi. Dividing 30 by an acceptance factor of .27 results in a tank with a volume of 111 gallons.

WellMate Pressure Tanks

Model Tank Size Total Volume Drawdown
@30/50 (PSI)
Drawdown
@40/60 (PSI)
Connector Ship Weight Price
WellMate Fiberglass 20 Gallon Bladder Pressure Tank - WM-6 WM-6 16" X 32" 20 gallons 5.9 gallons 5.1 gallons 1" NPTM 19 lbs.
OUR PRICE $180.00

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WellMate Fiberglass 30 Gallon Bladder Pressure Tank - WM-9 WM-9 16" X 44" 30 gallons 8.9 gallons 7.7 gallons 1" NPTM 31 lbs.
OUR PRICE $260.00

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WellMate Fiberglass 40 Gallon Bladder Pressure Tank - WM-12 WM-12 16" X 57" 40 gallons 12.2 gallons 10.5 gallons 1" NPTM 29 lbs.
OUR PRICE $372.00

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WellMate Fiberglass 47 Gallon Bladder Pressure Tank - WM-14WB WM-14WB 21" X 41" 47 gallons 14.1 gallons 12.2 gallons 1 1/4" NPTM 48 lbs.
OUR PRICE $420.00

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WellMate Fiberglass 60 Gallon Bladder Pressure Tank - WM-20WB WM-20WB 24" X 42" 60 gallons 18 gallons 16.2 gallons 1 1/4" NPTM 55 lbs.
OUR PRICE $660.00

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WellMate Fiberglass 87 Gallon Bladder Pressure Tank - WM-25WB WM-25WB 24" X 55" 87 gallons 26 gallons 22.5 gallons 1 1/4" NPTM 82 lbs.
OUR PRICE $699.00

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WellMate Fiberglass 120 Gallon Bladder Pressure Tank - WM-35WB WM-35WB 25" X 75" 120 gallons 34.2 gallons 29.6 gallons 1 1/4" NPTM 121 lbs.
OUR PRICE $907.00

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Wellmate Butyl Air Cell Replacement Kits

Model Tank Size Total Volume Drawdown
@30/50 (PSI)
Drawdown
@40/60 (PSI)
Connector Ship Weight Price
WellMate WM-6 / WM0075 PEU Air Cell Replacement Kit - Quick Connect Series CH3133-2 for WM-6 gallons gallons gallons lbs.
OUR PRICE $144.00

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WellMate WM-9 / WM0120 PEU Air Cell Replacement Kit - Quick Connect Series CH3134-2 for WM-9 gallons gallons gallons lbs.
OUR PRICE $172.00

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WellMate WM-12 / WM0150 PEU Air Cell Replacement Kit - Quick Connect Series CH3135-2 for WM-12 gallons gallons gallons lbs.
OUR PRICE $199.00

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WellMate WM-14WB / WM0180 PEU Air Cell Replacement Kit - Quick Connect Series CH4466 for WM-14WB gallons gallons gallons lbs.
OUR PRICE $219.00

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WellMate WM-20WB / WM0235 PEU Air Cell Replacement Kit - Quick Connect Series CH4846 for WM-20WB gallons gallons gallons lbs.
OUR PRICE $229.00

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WellMate WM-25WB / WM330 PEU Air Cell Replacement Kit - Quick Connect Series CH4467 for WM-25 gallons gallons gallons lbs.
OUR PRICE $234.00

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WellMate WM-35WB / WM0450 PEU Air Cell Replacement Kit - Quick Connect Series CH4468 for WM-35WB gallons gallons gallons lbs.
OUR PRICE $399.00

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Female Tank Tee Installation Packages

Male Tank Tee Illustration

1" Female Tank Tee / 1" Incoming Water Line

Fits: Wellmate WM-6, WM-9, WM-12 Flexcon H2PL22, H2PL35, FL7, FL12 Amtrol WX-202-H, WX-200PS

Model Price
Stainless Steel Installation Tee Package WELLMATE WM-6, WM-9, WM-12 and Flexcon H2PL22, H2PL35, FL7, FL12 Well Tanks SS-T1-F Lead Free
OUR PRICE $149.00

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No-Lead Brass Installation Tee Package WELLMATE WM-6, WM-9, WM-12 and Flexcon H2PL22, H2PL35, FL7, FL12 Well Tanks NL-BRASS-T1-F Lead Free
OUR PRICE $109.00

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1.25" Female Tank Tee / 1" Incoming Water Line

Fits: Wellmate WM-14, WM-20, WM-25, WM-35 Flexcon H2PL38SQ, H2PL50, H2PL65, H2PL82, H2PL90, H2PL120

Model Price
Stainless Steel Installation Tee Package FOR WELLMATE WM-14WB, 20WB, 25WB, 35WB and Flexcon H2PL38SQ, H2PL50, H2PL65, H2PL82, H2PL90 OR H2PL120 Well Tanks - 1" Incoming Water Line SS-T2-F Lead Free
OUR PRICE $149.00

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No-Lead Brass Installation Tee Package FOR WELLMATE WM-14WB, 20WB, 25WB, 35WB and Flexcon H2PL38SQ, H2PL50, H2PL65, H2PL82, H2PL90 OR H2PL120 Well Tanks - 1" Incoming Water Line NL-BRASS-T2-F Lead Free
OUR PRICE $119.00

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1.25" Female Tank Tee / 1.25" Incoming Water Line

Fits: Wellmate WM-14, WM-20, WM-25, WM-35 Flexcon H2PL38SQ, H2PL50, H2PL65, H2PL82, H2PL90, H2PL120

Model Price
Stainless Steel Installation Tee Package FOR WELLMATE WM-14WB, 20WB, 25WB, 35WB and Flexcon H2PL38SQ, H2PL50, H2PL65, H2PL82, H2PL90 or H2PL120 Well Tanks - 1 1/4" Incoming Water Line SS-T2-1.25-F Lead Free
OUR PRICE $189.00

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No-Lead Brass Installation Tee Package FOR WELLMATE WM-14WB, 20WB, 25WB, 35WB and Flexcon H2PL38SQ, H2PL50, H2PL65, H2PL82, H2PL90 or H2PL120 Well Tanks - 1 1/4" Incoming Water Line NL-BRASS-T2-1.25-F Lead Free
OUR PRICE $149.00

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