RO WATER STORAGE
TANKS

Pressurized under-sink tanks and atmospheric storage tanks for whole-house RO systems. Available from 2 to 500+ gallons.

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Pressurized Tank
Pressurized RO Storage Tank — 2.0 Gallon
Standard 2.0-gallon pressurized tank for under-sink RO systems. Polypropylene liner, stainless steel exterior. Pre-pressurized to 7 psi. NSF certified.
2.0 GallonNSF Certified7 psi Pre-ChargedStainless
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Pressurized Tank
Pressurized RO Storage Tank — 3.2 Gallon
Standard 3.2-gallon tank included with most Thunder© RO systems. Holds 2.5 gallons of usable water. Stainless steel with polypropylene liner.
3.2 GallonStandard Size2.5 Gal UsableStainless
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Pressurized Tank
Pressurized RO Storage Tank — 4.0 Gallon
Larger 4.0-gallon pressurized tank for higher-demand households. Compatible with all Thunder© systems. Greater usable water capacity for busy families.
4.0 GallonHigh DemandGreater CapacityStainless
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Atmospheric Tank
Atmospheric Storage Tank — 165 Gallon
Open-top atmospheric storage tank for whole-house RO systems. Polyethylene construction. Float valve and reboost pump kit available separately.
165 GallonPolyethyleneFloat ValveWhole House
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Atmospheric Tank
Atmospheric Storage Tank — 220 Gallon
220-gallon atmospheric storage for larger whole-house RO installations. Provides buffer during peak demand periods. UV-resistant polyethylene.
220 GallonUV ResistantPeak Demand BufferWhole House
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Atmospheric Tank
Atmospheric Storage Tank — 500 Gallon
Large 500-gallon atmospheric storage for estate and commercial whole-house RO applications. Supports high daily water demand.
500 GallonEstate / CommercialHigh DemandPolyethylene
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Tank Accessory
Reboost Pump Kit — Atmospheric Tank
Pump kit for converting atmospheric storage tanks into pressurized whole-house delivery systems. Includes pump, pressure tank, switch, and fittings.
Pump IncludedPressure SwitchEasy InstallUniversal