Reverse Osmosis Storage Tanks


RO Water Storage Tanks No one offers a broader line of RO water storage tanks than we do. Our brands of reverse osmosis water tanks include Genuine Amtrol RO tanks, who claim to have actually invented the technology behind RO tanks. So, if you need either a small RO tank for a point-of-use system, or a larger whole house tank, we offer the RO tank for your specific application. Below you will find Water tanks for reverse osmosis drinking water systems that offer total holding volumes between 2 to 86 gallons that are constructed with steel and/or fiberglass.



Products


RO Tank 2.1 Gal Powder Coated SteelRO Tank 2.1 Gal Powder Coated Steel
Part Number: ROT-2.1
Alternate Part Number: 15092006, TK-PRO-2-SS, RO-120
  • Powder Coated Steel
  • Total Volume: 2.1 Gallons
  • Holding Capacity @ 40 psi: 1.1 Gallons
  • Inlet/Outlet Size: 1/4" MPT
  • Height w/o Stand: 12 "
  • Diameter: 7-7/8 "
  • Tank Materials: Steel
  • Origin: Taiwan
  • Certifications: NSF 58
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MSRP: $61.00
$40.48 

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RO Tank 3.2 Gal, Plastic Protective Shell Over Steel TankRO Tank 3.2 Gal, Plastic Protective Shell Over Steel Tank
Part Number: ROT-3.2-P
Alternate Part Number: ROPT201-PLW, TP12P, 52-35138,ROPRO4-W, RO-122P
  • Protective Polypropylene Outer Layer
  • Total Volume: 3.2 Gallons
  • Holding Capacity @ 40 psi: 2 Gallons
  • Inlet/Outlet Size: 1/4" MPT
  • Height w/o Stand: 14.2 "
  • Diameter: 9.36 "
  • Tank Materials: Polypropylene Exterior/Interior, Steel Tank Frame
  • Origin: Taiwan
  • Certifications: NSF 58
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$59.88 

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RO Water Storage Tank 3.2 Gal Powder Coated SteelRO Water Storage Tank 3.2 Gal Powder Coated Steel
Part Number: ROT-3.2
Alternate Part Number: TKE-2200W, RO-122
  • Powder Coated Steel Exterior
  • Total Volume: 3.2 Gallons
  • Holding Capacity @ 40 psi: 2 Gallons
  • Inlet/Outlet Size: 1/4" MPT
  • Height w/o Stand: 14 "
  • Diameter: 9 "
  • Tank Materials: Steel
  • Origin: Taiwan
  • Certifications: NSF 58
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$43.48 

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Amtrol RO Tank 3 Gal SteelAmtrol Reverse Osmosis Water Storage RO Tank 3 Gal Steel RO-3 140S723
Part Number: 140S723
Alternate Part Number: RO-3
  • Powder Coated Steel Exterior
  • Total Volume: 3.2 Gallons
  • Holding Capacity @ 40 psi: 2 Gallons
  • Inlet/Outlet Size: 1/4" MPT
  • Height w/o Stand: 14-3/32 "
  • Diameter: 9-1/16 "
  • Tank Materials: Steel
  • Origin: USA
  • Certifications: NSF 61
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$63.87 

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RO Water Storage Tank 4.5 Gal Powder Coated SteelRO Water Storage Tank 4.5 Gal Powder Coated Steel
Part Number: ROT-4.5
Alternate Part Number: RO-132, TK-PRO-4-SS, 15112006, 55984-05, ROT-4W
  • Powder Coated Steel Exterior
  • Total Volume: 4.4 Gallons
  • Holding Capacity @ 40 psi: 2.8 Gallons
  • Inlet/Outlet Size: 1/4" MPT
  • Height w/o Stand: 13-3/4 "
  • Diameter: 11 "
  • Tank Materials: Steel
  • Origin: Taiwan
  • Certifications: NSF 61
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MSRP: $51.83
$41.88 

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Amtrol RO Tank 4.4 Gal SteelAmtrol Reverse Osmosis Water Storage RO Tank 4.4 Gal Steel RO-4 141S351
Part Number: 141S351
Alternate Part Number: RO-4, 140S351
  • Powder Coated Steel Exterior
  • Total Volume: 4.4 Gallons
  • Holding Capacity @ 40 psi: 2.8 Gallons
  • Inlet/Outlet Size: 1/4" MPT
  • Height w/o Stand: 15 "
  • Diameter: 11 "
  • Tank Materials: Steel
  • Origin: USA
  • Certifications: NSF 61
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MSRP: $79.95
$54.99 

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RO Water Storage Tank 5.5 Gal Powder Coated SteelRO Water Storage Tank 5.5 Gal Powder Coated Steel
Part Number: ROT-5.5
Alternate Part Number: TK-PRO-6W, RO-152
  • Powder Coated Steel Exterior
  • Total Volume: 5.5 Gallons
  • Inlet/Outlet Size: 1/4" MPT
  • Height w/ Stand: 12 "
  • Diameter: 12 "
  • Tank Materials: Steel
  • Origin: Taiwan
  • Certifications: NSF 61
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$58.40 

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Amtrol RO Tank 10 Gal SteelAmtrol Reverse Osmosis Water Storage RO Tank 10 Gal Steel RO-10 143-132
Part Number: 143-132
Alternate Part Number: RO-10
  • Powder Coated Steel Exterior
  • Total Volume: 10 Gallons
  • Holding Capacity @ 40 psi: 6.3 Gallons
  • Inlet/Outlet Size: 3/4" MPT
  • Height w/ Stand: 17-3/8 "
  • Diameter: 15-3/8 "
  • Tank Materials: Steel
  • Origin: USA
  • Certifications: NSF 61
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$169.73 

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RO Water Storage Tank 10 Gal SteelRO Water Storage Tank 10 Gal Steel
Part Number: ROT
Alternate Part Number: RO-760, RO-11,55984-06
  • Powder Coated Steel Exterior
  • Total Volume: 10.3 Gallons
  • Holding Capacity @ 40 psi: 6.3 Gallons
  • Inlet/Outlet Size: 1/4" or 3/4" MPT Stainless Steel
  • Height w/ Stand: 18-1/4 "
  • Diameter: 15-3/8 "
  • Tank Materials: Steel
  • Origin: Taiwan
  • Certifications: NSF 58
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$119.88 

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RO Water Storage Tank 14 Gal SteelRO Water Storage Tank 14 Gal Steel
Part Number: ROT
Alternate Part Number: RO-1070, TKE-1070-14B-34, RO-1070
  • Features a Powder Coated Steel Exterior
  • Total Volume: 14 Gallons
  • Holding Capacity @ 40 psi: 9 Gallons
  • Inlet/Outlet Size: 1/4" or 3/4" MPT Stainless Steel
  • Height w/ Stand: 22-7/8 "
  • Diameter: 15-3/8 "
  • Tank Materials: Steel
  • Origin: Taiwan
  • Certifications: NSF 58
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$109.88 

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Amtrol RO Tank 14 Gal SteelAmtrol Reverse Osmosis Water Storage RO Tank 14 Gal Steel RO-14, 143-293, 143-198
Part Number: 143
Alternate Part Number: 143-293, 143-198, RO-14
  • Powder Coated Steel Exterior
  • Total Volume: 14 Gallons
  • Holding Capacity @ 40 psi: 9.0 Gallons
  • Inlet/Outlet Size: 1/4" or 3/4" MPT Stainless Steel
  • Height w/ Stand: 22-13/16 "
  • Diameter: 15-3/8 "
  • Tank Materials: Steel
  • Origin: USA
  • Certifications: NSF 61
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$147.00 

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RO Water Storage Tank 20 Gal SteelRO Water Storage Tank 20 Gal Steel
Part Number: ROT-20
Alternate Part Number: RO-20, 144-120, 55984-07
  • Powder Coated Steel Exterior
  • Total Volume: 20 Gallons
  • Holding Capacity @ 40 psi: 11 Gallons
  • Inlet/Outlet Size: 3/4" or 1" MPT Stainless Steel
  • Height w/ Stand: 30 "
  • Diameter: 16 "
  • Tank Materials: Steel
  • Origin: Taiwan
  • Certifications: NSF 61
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$139.88 

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ROMATE RO Tank 20 Gal FiberglassROMATE RO Tank 20 Gal Fiberglass
Part Number: ROMATE-20
Alternate Part Number: 30839
  • High density polyethylene
  • Total Volume: 19.8 Gallons
  • Holding Capacity @ 40 psi: 11 Gallons
  • Inlet/Outlet Size: 1" MPT
  • Height w/ Stand: 32.25 "
  • Diameter: 16 "
  • Tank Materials: Fiberglass
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MSRP: $650.00
$269.00 

3+ for $242.10 ea

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Well-Rite WR-100 Well Tank/RO Water Storage Tank 32 Gal SteelWell-Rite WR-100 Well Tank/RO Water Storage Tank 32 Gal Steel
Part Number: WR-100
Alternate Part Number: FWR-100, ROT-32
  • Drawdown at 30/50 Setting: 10.9 Gallons
  • Total Volume: 32 Gallons
  • Holding Capacity @ 40 psi: 17.5 Gallons
  • Inlet/Outlet Size: 1-1/4" NPT Stainless Steel
  • Height w/ Stand: 27.75 "
  • Diameter: 21 "
  • Tank Materials: Steel
  • Origin: USA
  • Certifications: NSF 61
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MSRP: $468.18
$314.99 

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Amtrol RO Tank 34 Gal SteelAmtrol Reverse Osmosis Water Storage RO Tank 34 Gal Steel RO-34 147-47
Part Number: 147-47
  • Powder Coated Steel Exterior
  • Total Volume: 34 Gallons
  • Holding Capacity @ 40 psi: 18.2 Gallons
  • Inlet/Outlet Size: 1-1/4" MPT
  • Height w/ Stand: 29-1/2 "
  • Diameter: 22 "
  • Tank Materials: Steel
  • Origin: USA
  • Certifications: NSF 61
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MSRP: $399.00
$349.88 

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ROMATE RO Tank 40 Gal FiberglassROMATE RO Tank 40 Gal Fiberglass
Part Number: ROMATE-40
Alternate Part Number: 30865, DEV3115-72, 55984-08
  • High density polyethylene
  • Total Volume: 40.3 Gallons
  • Holding Capacity @ 40 psi: 22 Gallons
  • Inlet/Outlet Size: 1" MPT
  • Height w/ Stand: 56.75 "
  • Diameter: 16 "
  • Tank Materials: Fiberglass
  • Certifications: NSF 61
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MSRP: $1,008.00
$343.62 

3+ for $309.26 ea

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Well-Rite WR-140 Well Tank/RO Water Storage Tank 44 GalWell-Rite WR-140 Well Tank/RO Water Storage Tank 44 Gal
Part Number: WR-140
Alternate Part Number: FWR-140, WX-250, ROT-44
  • Drawdown at 30/50 Setting: 15 Gallons
  • Total Volume: 44 Gallons
  • Holding Capacity @ 40 psi: 17.7 Gallons
  • Inlet/Outlet Size: 1-1/4" NPT Stainless Steel
  • Height w/ Stand: 36.25 "
  • Diameter: 21 "
  • Tank Materials: Steel
  • Origin: USA
  • Certifications: NSF 61
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MSRP: $698.38
$465.99 

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Amtrol RO Tank 44 Gal SteelAmtrol Reverse Osmosis Water Storage RO Tank 44 Gal Steel RO-44 147-69
Part Number: 147-69
  • Powder Coated Steel Exterior
  • Total Volume: 44 Gallons
  • Holding Capacity @ 40 psi: 24.1 Gallons
  • Inlet/Outlet Size: 1-1/4" MPT
  • Height w/ Stand: 29-1/2 "
  • Diameter: 22 "
  • Tank Materials: Steel
  • Origin: USA
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$539.00 

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ROMATE RO Tank 80 Gal FiberglassROMATE RO Tank 80 Gal Fiberglass
Part Number: ROMATE-80
Alternate Part Number: 31054, DEV3115-73, 55984-09
  • High density polyethylene
  • Total Volume: 86.7 Gallons
  • Holding Capacity @ 40 psi: 47.55 Gallons
  • Inlet/Outlet Size: 1-1/4" MPT
  • Height w/ Stand: 55.5 "
  • Diameter: 24.25 "
  • Tank Materials: Fiberglass
  • Certifications: NSF 61
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MSRP: $1,540.00
$563.72 

3+ for $507.35 ea

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Well-Rite WR-260 Well Tank/RO Water Storage Tank 85 GalWell-Rite WR-260 Well Tank/RO Water Storage Tank 85 Gal
Part Number: WR-260
Alternate Part Number: FWR-260, WX-255
  • Drawdown at 30/50 Setting: 29 Gallons
  • Total Volume: 85 Gallons
  • Holding Capacity @ 40 psi: 47.2 Gallons
  • Inlet/Outlet Size: 1-1/4" NPT Stainless Steel
  • Height w/ Stand: 44.5 "
  • Diameter: 26 "
  • Tank Materials: Steel
  • Certifications: NSF 61
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MSRP: $802.74
$589.00 

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Amtrol RO Tank 86 Gal SteelAmtrol RO-86 Reverse Osmosis Water Storage RO Tank 86 Gal Steel 150-6
Part Number: 150-6
  • Powder Coated Steel Exterior
  • Total Volume: 86 Gallons
  • Holding Capacity @ 40 psi: 47.2 Gallons
  • Inlet/Outlet Size: 1-1/4" MPT
  • Height w/ Stand: 47-13/16 "
  • Diameter: 26 "
  • Tank Materials: Steel
  • Origin: USA
  • Certifications: NSF 61
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MSRP: $979.00
$649.00 

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Tank Stand for 1 gal to 4 gal RO TanksTank Stand for 1 gal to 4 gal RO Tanks
Part Number: 141-950
Plastic Tank Stand for Reverse Osmosis Accumulator Tanks fits Amtrol RO Tank models RO-1, RO-2, RO-3, RO-4 AND PAE RO Tank models RO-122 (3.2 gal), RO-132 / ROT-4W (4.4 gal).View Details
$3.86 

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Tank Stand for 3 to 4 Gal RO TanksTank Stand for 3 to 4 Gal RO Tanks
Part Number: PTS502
Plastic Tank Stand for Reverse Osmosis Accumulator Tanks fits most RO Tanks with an empty capacity of 3 to 4 gallons, including Amtrol RO-4, PAE RO Tank models RO-122 (3.2 gal), RO-132 / ROT-4W (4.4 gal). Does not fit 2 gal RO tanks (Amtrol RO-2,...View Details
$4.16 

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Tank Pressure Gauge (0-20 psi)Tank Pressure Gauge (0-20 psi)
Part Number: 54846
Tank Pressure Gauge Features: Ametek/Pentek CBC Series filters are highly effective at reducing unwanted taste, odor and chlorine and certain VOCs from potable drinking water. The unique structure of the carbon block enables it to reduce Giardia,...View Details
MSRP: $9.95
$8.79 

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PG-DIG Digital RO Tank Pressure Gauge (0-100 PSI)PG-DIG Digital RO Tank Pressure TPG-100 Gauge (0-100 PSI)
Part Number: PG-DIG
Alternate Part Number: TPG-300, 70PG-300
  • Measures 0-100 PSI
  • Automatically shuts off after 15 seconds of no use
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$18.99 

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Sanitizer Syringe 12ccSanitizer Syringe 12cc
Part Number: C1085
Qosina C1085 MonoJect Sanitizer Syringe with Luer Slip 12cc Features: Construction: Polypropylene Body and Plunger with a Polyisoprene Seal Use: Sanitizing filter housings, tubing and RO Tanks Sanitizer Syringe 12cc Instructions: Remove tube from...View Details
$1.49 

10+ for $1.19 ea
25+ for $.97 ea
50+ for $.89 ea
100+ for $.75 ea

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DMfit Union Tee - 1/4" x 1/4" x 1/4" Push-inDMfit Union Tee - 1/4
Part Number: ATU040404
DMfit ATU040404 Union Tee - 1/4" x 1/4" x 1/4" Push-in Features: Acetal copolymer construction O-rings are NBR or EPDM Unique oval collet design FDA approved materials For water, air, gases, vacuum, & liquids NSF Certified 51 & 62...View Details
$1.93 

20+ for $1.54 ea
50+ for $1.35 ea

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DMfit Union Tee - 3/8" x 3/8" x 3/8" Push-inDMfit Union Tee - 3/8
Part Number: ATU060606
DMfit ATU060606 Union Tee - 3/8" x 3/8" x 3/8" Push-in Features: Acetal copolymer construction O-rings are NBR or EPDM Unique oval collet design FDA approved materials For water, air, gases, vacuum, & liquids NSF Certified 51 & 62...View Details
$2.80 

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DMfit REDUCING Union Tee - 3/8" x 3/8" x 1/4" Push-inDMfit REDUCING Union Tee - 3/8
Part Number: ATU060604
DMfit ATU060604 REDUCING Union Tee - 3/8" x 3/8" x 1/4" Push-in Features: Acetal copolymer construction O-rings are NBR or EPDM Unique oval collet design FDA approved materials For water, air, gases, vacuum, & liquids NSF Certified 51 &...View Details
$2.76 

10+ for $2.24 ea
40+ for $1.79 ea

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John Guest Shut-Off Valve-Polypro Elbow NPTF - 1/4 x 1/4 NPTFJohn Guest Shut-Off Valve-Polypro Elbow NPTF - 1/4 x 1/4 NPTF
Part Number: PPSV500822W
John Guest PPSV500822W Shut-Off Valve-Polypro Elbow NPTF - 1/4 x 1/4 NPTF Features: Gray acetal copolymer construction Nitrile O-rings FDA approved materials NSF Certified 51 & 62 Suitable for water, air, inert gases And pneumatic...View Details
MSRP: $6.42
$5.25 

5+ for $5.20 ea
10+ for $5.09 ea
50+ for $4.99 ea
100+ for $4.83 ea
200+ for $4.73 ea

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John Guest Shut-Off Valve-Polypro Elbow NPTF - 3/8 x 1/4 NPTFJohn Guest Shut-Off Valve-Polypro Elbow NPTF - 3/8 x 1/4 NPTF
Part Number: PPSV501222W
John Guest PPSV501222W Shut-Off Valve-Polypro Elbow NPTF - 3/8 x 1/4 NPTF Features: Gray acetal copolymer construction Nitrile O-rings FDA approved materials NSF Certified 51 & 62 Suitable for water, air, inert gases And pneumatic...View Details
MSRP: $6.57
$5.47 

5+ for $5.42 ea
10+ for $5.31 ea
50+ for $5.20 ea
100+ for $5.03 ea
200+ for $4.92 ea

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SeaTech Shut-Off Valve Kit - 3/4 Female NPTF x 3/8 Push-inSeaTech Shut-Off Valve Kit - 3/4 Female NPTF x 3/8 Push-in
Part Number: BVK-PVC80075-06
TANK BALL VALVE KIT is recommended for the 14 gallon storage tank . A 3/4" Female Coupling is provided to connect 3/4" male NPT end of tank valve to 3/4" male NPT tank inlet. Features: Exclusive 1/4 turn lever with safety collar Dual EPDM O-ring...View Details
$5.37 

10+ for $4.03 ea
50+ for $3.49 ea

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SeaTech Shut-Off Valve Kit - 3/4 Female NPTF x 1/2 Push-inSeaTech Shut-Off Valve Kit - 3/4 Female NPTF x 1/2 Push-in
Part Number: BVK-PVC80075-08
TANK BALL VALVE KIT is recommended for the 14 gallon storage tank . A 3/4" Female Coupling is provided to connect 3/4" male NPT end of tank valve to 3/4" male NPT tank inlet. Features: Exclusive 1/4 turn lever with safety collar Dual EPDM O-ring...View Details
$1.79 

10+ for $1.34 ea
50+ for $1.16 ea

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RO WATER STORAGE HOLDING TANK CAPACITY AT VARIOUS INLET PRESSURES PRE-CHARGED PRESSURE @ 5 PSIG
NOTE: PRECHARGE FOR ROMATE20, 40 & 80 = 10 PSIG

Model No. Total Tank
Volume (gal)
Gals @
20 psig
Gals @
30 psig
Gals @
40 psig
Gals @
50 psig
Gals @
60 psig
Gals @
70 psig
RO-2/RO120 2.0 0.9 1.1 1.3 1.4 1.5 1.5
RO-3/RO122 3.2 1.4 1.8 2.0 2.2 2.4 2.5
RO-4/RO132* 4.4 1.9 2.5 2.8 3.1 3.2 3.4
RO-10/RO760 10.0 4.3 5.6 6.3 6.9 7.3 7.6
RO-14/RO1070 14.0 6.1 7.8 9.0 9.7 10.3 10.7
ROMATE20 19.8 5.7 8.9 10.9 12.2 13.3 14.0
RO-20/RO2000 20.0 5.8 8.9 11.0 * * *
RO-34 34.0 9.1 14.7 18.2 20.6 22.4 23.8
ROMATE40 40.3 11.6 18.0 22.1 24.9 27.0 28.5
RO-44 44.0 12.7 19.7 24.1 27.2 29.5 31.2
RO-86 86.0 24.8 38.5 47.2 53.2 * *
ROMATE80 86.7 24.99 38.8 47.5 53.6 58.03 61.42

*  RO-4 / RO-132 / ROT-4 is the Standard Size RO Tank for most RO systems.

As your water demands grow one thing to consider with a Reverse Osmosis drinking water system is the capacity of the RO storage tank. RO water storage tank Holding Capacity is dependent on INLET water pressure to the tank and the RO tank air pressure. Typically the RO Tank Capacity is 50% of the Total RO Tank Volume (empty). Many popular systems come with RO tanks with storage and the capacities that range from 4 gallons to 25 gallons RO tanks and up. One of the easies ways to extend the available filtered water is to add an additional RO tank.

Options to increase Reverse Osmosis Water Tank Storage Capacity:

  1. Tee a line to a second tank of any capacity
    - must have the same precharge as your existing tank
  2. Remove the existing RO water tank and replace with a larger tank of your choice